- 现在需要在一个mybatis的select标签内同时查询多张表的数据，要怎么写啊？
-
select count(1) from tab_1 t where TO_CHAR(t.date,'YYYYMMDD')=#{date};
select count(1) from tab_2 t where TO_CHAR(t.date,'YYYYMMDD')=#{date};
select count(1) from tab_3 t where TO_CHAR(t.date,'YYYYMMDD')=#{date};
select count(1) from tab_4 t where TO_CHAR(t.date,'YYYYMMDD')=#{date};
Oracle 到MySQL数据迁移如何去做?_course
2018-01-09由于业务需求，需要将Oracle中的数据迁移到MySQL中，小白现有几个问题问下老司机 1.Oracle往MySQL数据迁移，如何做？ 是借助第3方工具?（求推荐工具），还是导出sql？ 2.我看了Oracle和MySQL一些字段类型以及默认值的设置，比如时间，是不同， 怎么做兼容？（小白猜测一张一张去修改表结构？） 3.之前系统是用的oracle，包括报表还有一些封装的sql，分页，函数等等， 这个如何转换？因为我也不知道，Oracle的一些语法MySQL能不能用， 是采用笨方法一个一个去试验么？
为什么用java向mysql里插入数据，执行了一次却插入了两条数据？？？_course
2019-04-11
java ee目前流行技术_course
2010-05-12我现在还是在学习,下面是了解到的一些技术,ssh就不说了,还有(orm)ibatis(可能因为还是菜鸟吧,还是喜欢hibernate,省事),lucene+Compass(查询),EJB,数据库mysql.sql server,oracle 服务器也就会tomcat,别的只是了解了一下,版本控制cvs(不知道过时没),svn,还有ant,maven,前台:jQuery,ext.剩下还有了解和只是听说过的的--jsf,jbpm,Flex3,uml,cms(什么东东),javascrpt(dojo,dwr怎么样?) 请大家帮我看一下,哪些技术是现在流行的正在用的,哪些有前景,哪些该过时了? 只有30分都拿出来了
mysql数据库如何存储数学函数表达式_course
2020-05-15# 问题描述: 1. 已有离散数据x,y集合. 2. 通过不同的拟合算法得到不同的关系曲线表达式, 包括(一次函数公式, 指数公式, 对数公式, 幂数公式, 多项式公式.) 3. 需要将得到的表达式存储到数据库. 4. 已知x值, 通过选择不同的表达式, 计算y值. # 求助: 数据库存储关系曲线表达式的表应该如何设计?
Spring框架入门，tomcat启动成功，但是出现关于上下文加载异常？_course
2019-07-20这是一个制作登陆页面的小练习，大概长这样  **错误信息是在Server startup后立马就出现的**，还没来得及访问index.jsp呢！求指点，谢谢。 web.xml存放在WEB-INF文件夹下  ## 错误信息： ``` 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Server version: Apache Tomcat/8.5.42 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Server built: Jun 4 2019 20:29:04 UTC 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Server number: 8.5.42.0 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: OS Name: Windows 10 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: OS Version: 10.0 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Architecture: amd64 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Java Home: C:\Program Files\Java\jdk1.8.0_201\jre 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: JVM Version: 1.8.0_201-b09 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: JVM Vendor: Oracle Corporation 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: CATALINA_BASE: D:\eclipse-workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: CATALINA_HOME: D:\apache-tomcat-8.5.42 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Command line argument: -Dcatalina.base=D:\eclipse-workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Command line argument: -Dcatalina.home=D:\apache-tomcat-8.5.42 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Command line argument: -Dwtp.deploy=D:\eclipse-workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Command line argument: -Djava.endorsed.dirs=D:\apache-tomcat-8.5.42\endorsed 七月 20, 2019 3:20:35 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Command line argument: -Dfile.encoding=UTF-8 七月 20, 2019 3:20:35 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent 信息: Loaded APR based Apache Tomcat Native library [1.2.21] using APR version [1.6.5]. 七月 20, 2019 3:20:35 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent 信息: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true]. 七月 20, 2019 3:20:35 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent 信息: APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true] 七月 20, 2019 3:20:35 下午 org.apache.catalina.core.AprLifecycleListener initializeSSL 信息: OpenSSL successfully initialized [OpenSSL 1.1.1a 20 Nov 2018] 七月 20, 2019 3:20:35 下午 org.apache.coyote.AbstractProtocol init 信息: Initializing ProtocolHandler ["http-nio-8080"] 七月 20, 2019 3:20:36 下午 org.apache.tomcat.util.net.NioSelectorPool getSharedSelector 信息: Using a shared selector for servlet write/read 七月 20, 2019 3:20:36 下午 org.apache.coyote.AbstractProtocol init 信息: Initializing ProtocolHandler ["ajp-nio-8009"] 七月 20, 2019 3:20:36 下午 org.apache.tomcat.util.net.NioSelectorPool getSharedSelector 信息: Using a shared selector for servlet write/read 七月 20, 2019 3:20:36 下午 org.apache.catalina.startup.Catalina load 信息: Initialization processed in 1265 ms 七月 20, 2019 3:20:36 下午 org.apache.catalina.core.StandardService startInternal 信息: Starting service [Catalina] 七月 20, 2019 3:20:36 下午 org.apache.catalina.core.StandardEngine startInternal 信息: Starting Servlet Engine: Apache Tomcat/8.5.42 七月 20, 2019 3:20:39 下午 org.apache.catalina.core.ApplicationContext log 信息: No Spring WebApplicationInitializer types detected on classpath 七月 20, 2019 3:20:39 下午 org.apache.jasper.servlet.TldScanner scanJars 信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. 七月 20, 2019 3:20:39 下午 org.apache.catalina.core.ApplicationContext log 信息: Initializing Spring root WebApplicationContext log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. 七月 20, 2019 3:20:42 下午 org.apache.catalina.core.StandardContext listenerStart 严重: Exception sending context initialized event to listener instance of class [org.springframework.web.context.ContextLoaderListener] org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'usersService' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'usersMapper' of bean class [yan.ibbie.service.impl.UsersServiceImpl]: Bean property 'usersMapper' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1718) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1433) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:400) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:291) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4770) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5236) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1423) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1413) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'usersMapper' of bean class [yan.ibbie.service.impl.UsersServiceImpl]: Bean property 'usersMapper' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:243) at org.springframework.beans.AbstractNestablePropertyAccessor.processLocalProperty(AbstractNestablePropertyAccessor.java:426) at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:278) at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:266) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:97) at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:77) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1714) ... 22 more 七月 20, 2019 3:20:42 下午 org.apache.catalina.core.StandardContext startInternal 严重: One or more listeners failed to start. Full details will be found in the appropriate container log file 七月 20, 2019 3:20:42 下午 org.apache.catalina.core.StandardContext startInternal 严重: Context [/SpringLogin] startup failed due to previous errors 七月 20, 2019 3:20:42 下午 org.apache.catalina.core.ApplicationContext log 信息: Closing Spring root WebApplicationContext 七月 20, 2019 3:20:42 下午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesJdbc 警告: The web application [SpringLogin] registered the JDBC driver [com.mysql.cj.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 七月 20, 2019 3:20:42 下午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads 警告: The web application [SpringLogin] appears to have started a thread named [mysql-cj-abandoned-connection-cleanup] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: java.lang.Object.wait(Native Method) java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144) com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:85) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) java.lang.Thread.run(Thread.java:748) 七月 20, 2019 3:20:42 下午 org.apache.coyote.AbstractProtocol start 信息: Starting ProtocolHandler ["http-nio-8080"] 七月 20, 2019 3:20:42 下午 org.apache.coyote.AbstractProtocol start 信息: Starting ProtocolHandler ["ajp-nio-8009"] 七月 20, 2019 3:20:42 下午 org.apache.catalina.startup.Catalina start 信息: Server startup in 5949 ms 七月 20, 2019 3:20:45 下午 org.apache.catalina.loader.WebappClassLoaderBase checkStateForResourceLoading 信息: Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1384) at org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:1034) at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.checkThreadContextClassLoader(AbandonedConnectionCleanupThread.java:117) at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:84) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) ``` ## web.xml配置如下： ``` <?xml version="1.0" encoding="UTF-8"?> <web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"> <!-- 设置Spring配置文件路径 --> <!-- 当tomcat加载web.xml时，会把Spring配置文件信息存放到application对象 --> <!-- WebApplicationContext是ApplicationContext的子接口 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <!-- 加载Spring配置文件 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> </web-app> ``` ## applicationContext.xml的Spring配置如下： ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- 数据源封装类 --> <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/ssm?serverTimezone=GMT%2B8"/> <property name="username" value="root"/> <property name="password" value="147852369"/> </bean> <!-- SqlSessionFactory --> <bean id="factory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="datasource"/> </bean> <!-- 扫描器 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactory" ref="factory"/> <property name="basePackage" value="yan.ibbie.mapper"/> </bean> <!-- 创建UsersService的实现类，其中usersMapper是Spring自动创建的bean --> <bean id="usersService" class="yan.ibbie.service.impl.UsersServiceImpl"> <property name="usersMapper" ref="usersMapper"/> </bean> </beans> ``` ## index.jsp页面如下： ``` <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="/js/jquery-3.4.1.js"></script> <script type="text/javascript"> $(function(){ $("a").click(function(){ $("img").attr("src","validcode?date="+new Date()); return false; }) }) </script> </head> <body> ${error } <form action="Login" method="post"> 用户名：<input type="text" name="username" /><br> 密码：<input type="password" name="password" /><br> 验证码：<input type="text" size="1" name="code"/><img src="validcode" width="80" height="40"/><a href="">看不清</a><br> <input type="submit" value="登陆" /><input type="reset" value="重置" /> </form> </body> </html> ``` ## 出错的是LoginServlet中一堆aaaaa那行，LoginServlet如下： ``` package yan.ibbie.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.context.ApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import yan.ibbie.pojo.Users; import yan.ibbie.service.UsersService; import yan.ibbie.service.impl.UsersServiceImpl; /** * Servlet implementation class LoginServlet */ @WebServlet("/Login") public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; private UsersService usersService; @Override public void init() throws ServletException { System.out.println("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"+getServletContext()); ApplicationContext ac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext()); usersService = ac.getBean("usersService",UsersServiceImpl.class); } @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String code = req.getParameter("code"); HttpSession session = req.getSession(); String codeSession = session.getAttribute("validcode").toString(); if (codeSession.equals(code)) { Users users = new Users(); String username = req.getParameter("username"); String password = req.getParameter("password"); users.setUsername(username); users.setPasserword(password); Users user = usersService.login(users); if (user!=null) { resp.sendRedirect("main.jsp"); }else { req.setAttribute("error", "用户名和密码不正确"); req.getRequestDispatcher("index.jsp").forward(req, resp); } }else { req.setAttribute("error", "验证码不正确"); req.getRequestDispatcher("index.jsp").forward(req, resp); } } } ```
打开eclipse 选择workspace时出现了需要查看logs的问题？_course
2019-09-09今天装了下mysql改了下环境变量。打开了eclipse后发现eclipse找不到jre了，于是我把环境变量改了回来然后发现eclipse没有提示找不到jre，让我选择个workspace，第一次我将其选择了原来的workspace中，提示错误 修改完环境变量后测试了环境变量是没有问题的 jdk版本是11  打开了log后提示如下 ``` !SESSION 2019-09-09 20:03:26.681 ----------------------------------------------- eclipse.buildId=4.12.0.I20190605-1800 java.version=11.0.4 java.vendor=Oracle Corporation BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=zh_CN Framework arguments: -product org.eclipse.epp.package.jee.product Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product This is a continuation of log file E:\java workspace\.metadata\.bak_0.log Created Time: 2019-09-09 20:03:57.979 !ENTRY org.eclipse.jst.ws.ui 2 0 2019-09-09 20:03:57.979 !MESSAGE Could not resolve module: org.eclipse.jst.ws.ui [567] Unresolved requirement: Require-Bundle: org.eclipse.wst.ws.explorer; bundle-version="[1.0.204,1.1.0)" -> Bundle-SymbolicName: org.eclipse.wst.ws.explorer; bundle-version="1.0.950.v201903050508"; singleton:="true" org.eclipse.wst.ws.explorer [876] Unresolved requirement: Require-Bundle: org.eclipse.equinox.http.jetty; bundle-version="[1.0.0,4.0.0)" -> Bundle-SymbolicName: org.eclipse.equinox.http.jetty; bundle-version="3.7.100.v20190516-1504" org.eclipse.equinox.http.jetty [344] Unresolved requirement: Import-Package: org.eclipse.jetty.server; version="[9.4.0,10.0.0)" -> Export-Package: org.eclipse.jetty.server; bundle-symbolic-name="org.eclipse.jetty.server"; bundle-version="9.4.18.v20190429"; version="9.4.18"; uses:="javax.net.ssl,javax.security.auth,javax.servlet,javax.servlet.http,org.eclipse.jetty.http,org.eclipse.jetty.io,org.eclipse.jetty.io.ssl,org.eclipse.jetty.server.handler,org.eclipse.jetty.server.session,org.eclipse.jetty.util,org.eclipse.jetty.util.annotation,org.eclipse.jetty.util.component,org.eclipse.jetty.util.log,org.eclipse.jetty.util.resource,org.eclipse.jetty.util.ssl,org.eclipse.jetty.util.thread" org.eclipse.jetty.server [424] Unresolved requirement: Import-Package: javax.naming Unresolved requirement: Import-Package: org.eclipse.jetty.http; version="[9.4.0,10.0.0)" -> Export-Package: org.eclipse.jetty.http; bundle-symbolic-name="org.eclipse.jetty.http"; bundle-version="9.4.18.v20190429"; version="9.4.18"; uses:="javax.servlet,javax.servlet.http,org.eclipse.jetty.io,org.eclipse.jetty.util,org.eclipse.jetty.util.component,org.eclipse.jetty.util.log,org.eclipse.jetty.util.resource" org.eclipse.jetty.http [421] Unresolved requirement: Import-Package: org.eclipse.jetty.util; version="[9.4.18,10.0.0)" -> Export-Package: org.eclipse.jetty.util; bundle-symbolic-name="org.eclipse.jetty.util"; bundle-version="9.4.18.v20190429"; version="9.4.18"; uses:="javax.servlet,javax.servlet.http,org.eclipse.jetty.util.annotation,org.eclipse.jetty.util.component,org.eclipse.jetty.util.log,org.eclipse.jetty.util.resource,org.eclipse.jetty.util.thread" org.eclipse.jetty.util [426] Unresolved requirement: Import-Package: javax.naming Unresolved requirement: Import-Package: org.eclipse.jetty.io; version="[9.4.18,10.0.0)" -> Export-Package: org.eclipse.jetty.io; bundle-symbolic-name="org.eclipse.jetty.io"; bundle-version="9.4.18.v20190429"; version="9.4.18"; uses:="javax.net.ssl,org.eclipse.jetty.util,org.eclipse.jetty.util.annotation,org.eclipse.jetty.util.component,org.eclipse.jetty.util.log,org.eclipse.jetty.util.thread" org.eclipse.jetty.io [422] Unresolved requirement: Import-Package: org.eclipse.jetty.util.annotation; version="[9.4.18,10.0.0)" -> Export-Package: org.eclipse.jetty.util.annotation; bundle-symbolic-name="org.eclipse.jetty.util"; bundle-version="9.4.18.v20190429"; version="9.4.18" Unresolved requirement: Import-Package: org.eclipse.jetty.util; version="[9.4.18,10.0.0)" -> Export-Package: org.eclipse.jetty.util; bundle-symbolic-name="org.eclipse.jetty.util"; bundle-version="9.4.18.v20190429"; version="9.4.18"; uses:="javax.servlet,javax.servlet.http,org.eclipse.jetty.util.annotation,org.eclipse.jetty.util.component,org.eclipse.jetty.util.log,org.eclipse.jetty.util.resource,org.eclipse.jetty.util.thread" Unresolved requirement: Import-Package: org.eclipse.jetty.server.handler; version="[9.4.0,10.0.0)" -> Export-Package: org.eclipse.jetty.server.handler; bundle-symbolic-name="org.eclipse.jetty.server"; bundle-version="9.4.18.v20190429"; version="9.4.18"; uses:="javax.servlet,javax.servlet.descriptor,javax.servlet.http,org.eclipse.jetty.http,org.eclipse.jetty.io,org.eclipse.jetty.server,org.eclipse.jetty.util,org.eclipse.jetty.util.annotation,org.eclipse.jetty.util.component,org.eclipse.jetty.util.log,org.eclipse.jetty.util.resource" ``` 我之前使用eclipse 是se版本 前几天学习web部分 去下载了ee版本 当时选择workspace时没有出现此问题，今天发现问题后我卸载了eclipse，重新从之前的解压包中解压eclipse再次尝试，还是有同样的问题：在选择workspace时报错。
内连接、左连接、右连接的哪个性能更好？（Oracle）_course
2016-11-17 执行计划的cost，都是一样啊。。。
springboot配置支持jsp依赖报错，但是不影响项目运行。_course
2019-05-18想Spring boot 支持jsp，在pom.xml文件中加入了依赖如下： ``` <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <scope>provided</scope> </dependency> <!-- jstl标签 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> ``` 结果启动项目报错，但是最后还是成功启动了，所有功能都能实现且无异常。但是报错让人很不舒服。。。 在Maven Dependencies中，有提及的mchange-commons-java-0.2.11.jar包。 ``` . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.1.5.RELEASE) 2019-05-18 22:36:53.484 INFO 10320 --- [ main] com.theo.alpha.AlphaApplication : Starting AlphaApplication on theo with PID 10320 (E:\springboot\alpha\target\classes started by Theo in E:\springboot\alpha) 2019-05-18 22:36:53.493 INFO 10320 --- [ main] com.theo.alpha.AlphaApplication : No active profile set, falling back to default profiles: default 2019-05-18 22:36:58.575 INFO 10320 --- [g-Init-Reporter] com.mchange.v2.log.MLog : MLog clients using slf4j logging. 2019-05-18 22:36:58.673 INFO 10320 --- [ main] com.mchange.v2.c3p0.C3P0Registry : Initializing c3p0-0.9.5.2 [built 08-December-2015 22:06:04 -0800; debug? true; trace: 10] 2019-05-18 22:37:00.287 INFO 10320 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8081 (http) 2019-05-18 22:37:00.408 INFO 10320 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2019-05-18 22:37:00.412 INFO 10320 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.19] 2019-05-18 22:37:01.735 WARN 10320 --- [ main] o.a.tomcat.util.scan.StandardJarScanner : Failed to scan [file:/C:/Users/Theo/.m2/repository/com/mchange/c3p0/0.9.5.2/mchange-commons-java-0.2.11.jar] from classloader hierarchy java.io.FileNotFoundException: C:\Users\Theo\.m2\repository\com\mchange\c3p0\0.9.5.2\mchange-commons-java-0.2.11.jar (系统找不到指定的文件。) at java.util.zip.ZipFile.open(Native Method) ~[na:1.8.0_152] at java.util.zip.ZipFile.<init>(ZipFile.java:225) ~[na:1.8.0_152] at java.util.zip.ZipFile.<init>(ZipFile.java:155) ~[na:1.8.0_152] at java.util.jar.JarFile.<init>(JarFile.java:166) ~[na:1.8.0_152] at java.util.jar.JarFile.<init>(JarFile.java:130) ~[na:1.8.0_152] at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:164) ~[tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65) ~[tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49) ~[tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:374) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:309) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:266) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:229) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262) [tomcat-embed-jasper-9.0.19.jar:9.0.19] at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104) [tomcat-embed-jasper-9.0.19.jar:9.0.19] at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83) [tomcat-embed-jasper-9.0.19.jar:9.0.19] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5139) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) [tomcat-embed-core-9.0.19.jar:9.0.19] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_152] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.19.jar:9.0.19] at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_152] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:831) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) [tomcat-embed-core-9.0.19.jar:9.0.19] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_152] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.19.jar:9.0.19] at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_152] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.core.StandardService.startInternal(StandardService.java:423) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.apache.catalina.startup.Tomcat.start(Tomcat.java:455) [tomcat-embed-core-9.0.19.jar:9.0.19] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:106) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:427) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:180) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) [spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE] at com.theo.alpha.AlphaApplication.main(AlphaApplication.java:10) [classes/:na] 2019-05-18 22:37:01.782 INFO 10320 --- [ main] org.apache.jasper.servlet.TldScanner : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. 2019-05-18 22:37:01.809 INFO 10320 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/alpha] : Initializing Spring embedded WebApplicationContext 2019-05-18 22:37:01.809 INFO 10320 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 8078 ms 2019-05-18 22:37:04.034 INFO 10320 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor' 2019-05-18 22:37:05.326 INFO 10320 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8081 (http) with context path '/alpha' 2019-05-18 22:37:05.346 INFO 10320 --- [ main] com.theo.alpha.AlphaApplication : Started AlphaApplication in 13.509 seconds (JVM running for 15.915) ``` 删除依赖后不报错，但是直接访问jsp页面会变成下载，通过Controller跳转到jsp页面会报错 ``` Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Sat May 18 23:03:06 CST 2019 There was an unexpected error (type=Not Found, status=404). No message available ``` 以下是项目的POM.xml文件 ``` <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.5.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <groupId>com.theo</groupId> <artifactId>alpha</artifactId> <version>0.0.1-SNAPSHOT</version> <name>alpha</name> <description>Demo project for Spring Boot</description> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.0.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- jsp支持 --> <!-- <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <scope>provided</scope> </dependency> --> <!-- jstl标签库 --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> <!-- 上传下载用 --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <!-- 自定义标签 --> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project> ```
JDBC连接数据库时区问题_course
2020-04-19# 求求求求求求助！！！ jdbc连接时区问题  我查了报错信息，解决方案都是时区中文乱码等问题。解决方案就是在后面加 servrerTimezone=UTC 但是我加了以后没反应 命令窗口mvn jpa-schema:generate还是报上图的错 我的修改下下面  请求大佬帮助，卡在这好久了，一直解决不了
数据库迁移，旧系统数据迁移到新系统_course
2019-07-01新系统有张表是旧系统中多张表某些字段组合的数据 比如说：旧系统中A表中的a、b、c字段和B表中的e、f字段组成了新系统的C表 而且新系统的字段类型部分还需要转换 请问这种迁移时应如何实现？
mybatis insert 实体类的时候 实体类有个字段是集合 这样的数据可以for each进去吗 具体怎么写_course
2019-07-22``` private String a ; private List<String> b; private String c; xml配置文件 <resultMap type="xMain" id="xResult"> <result property="a" column="a" /> <result property="c" column="c" /> </resultMap> <insert id="insertMain" parameterType="xMain"> ** 具体这里的foreach 的 b字段怎么写！！！！！！！！！！！！！** </insert> ``` 我期望存入表中的 是 1: a b.get(1).x b.get(1)y c 2: a b.get(2).x b.get(2).y c 3: a b.get(3).x b.get(3)y c 就是集合有几条 就一次性通过mybatis的xml存进去
IDEA中Tomcat服务器重启后报异常怎么解决？_course
2020-02-28``` java -Dcatalina.base=C:\Users\wx\.IntelliJIdea2017.3\system\tomcat\Tomcat_7_0_96_study_2 "-Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 7.0" "-Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 7.0\temp" -Dcom.sun.management.jmxremote= -Dcom.sun.management.jmxremote.port=1099 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.password.file=C:\Users\wx\.IntelliJIdea2017.3\system\tomcat\Tomcat_7_0_96_study_2\jmxremote.password -Dcom.sun.management.jmxremote.access.file=C:\Users\wx\.IntelliJIdea2017.3\system\tomcat\Tomcat_7_0_96_study_2\jmxremote.access -Djava.rmi.server.hostname=127.0.0.1 -cp "C:\Program Files\Apache Software Foundation\Tomcat 7.0\bin\bootstrap.jar;C:\Program Files\Apache Software Foundation\Tomcat 7.0\bin\tomcat-juli.jar" org.apache.catalina.startup.Bootstrap start [2020-02-28 12:09:58,816] Artifact Filter:war exploded: Waiting for server connection to start artifact deployment... 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Server version: Apache Tomcat/7.0.96 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Server built: Jul 24 2019 13:00:10 UTC 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Server number: 7.0.96.0 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: OS Name: Windows 8 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: OS Version: 6.2 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Architecture: amd64 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Java Home: C:\Program Files\Java\jdk1.7.0_15\jre 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: JVM Version: 1.7.0_15-b03 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: JVM Vendor: Oracle Corporation 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: CATALINA_BASE: C:\Users\wx\.IntelliJIdea2017.3\system\tomcat\Tomcat_7_0_96_study_2 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: CATALINA_HOME: C:\Program Files\Apache Software Foundation\Tomcat 7.0 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcatalina.base=C:\Users\wx\.IntelliJIdea2017.3\system\tomcat\Tomcat_7_0_96_study_2 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 7.0 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 7.0\temp 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcom.sun.management.jmxremote= 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcom.sun.management.jmxremote.port=1099 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcom.sun.management.jmxremote.ssl=false 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcom.sun.management.jmxremote.password.file=C:\Users\wx\.IntelliJIdea2017.3\system\tomcat\Tomcat_7_0_96_study_2\jmxremote.password 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcom.sun.management.jmxremote.access.file=C:\Users\wx\.IntelliJIdea2017.3\system\tomcat\Tomcat_7_0_96_study_2\jmxremote.access 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Djava.rmi.server.hostname=127.0.0.1 二月 28, 2020 12:09:59 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.7.0_15\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;D:\oracle\applocation\bin;C:\windows\system32;C:\windows;C:\windows\System32\Wbem;C:\windows\System32\WindowsPowerShell\v1.0\;C:\windows\System32\OpenSSH\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;D:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;D:\Program Files\Microsoft SQL Server\100\Tools\Binn\;D:\Program Files\Microsoft SQL Server\100\DTS\Binn\;D:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\;C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\;D:\Program Files (x86)\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files\Java\jdk1.7.0_15\bin;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Java\jdk1.8.0_201\bin;C:\AppServ\Apache24\bin;C:\AppServ\php5;C:\AppServ\MySQL\bin;C:\Users\wx\AppData\Local\Microsoft\WindowsApps;;. 二月 28, 2020 12:09:59 下午 org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["http-bio-8080"] 二月 28, 2020 12:09:59 下午 org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["ajp-bio-8009"] 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.Catalina load INFO: Initialization processed in 486 ms 二月 28, 2020 12:09:59 下午 org.apache.catalina.core.StandardService startInternal INFO: Starting service Catalina 二月 28, 2020 12:09:59 下午 org.apache.catalina.core.StandardEngine startInternal INFO: Starting Servlet Engine: Apache Tomcat/7.0.96 二月 28, 2020 12:09:59 下午 org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["http-bio-8080"] 二月 28, 2020 12:09:59 下午 org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["ajp-bio-8009"] 二月 28, 2020 12:09:59 下午 org.apache.catalina.startup.Catalina start INFO: Server startup in 45 ms Connected to server [2020-02-28 12:09:59,866] Artifact Filter:war exploded: Artifact is being deployed, please wait... 二月 28, 2020 12:10:00 下午 org.apache.catalina.deploy.WebXml setVersion WARNING: Unknown version string [4.0]. Default version will be used. 二月 28, 2020 12:10:00 下午 org.apache.catalina.core.ContainerBase addChildInternal SEVERE: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1018) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:994) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1899) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:792) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:619) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:566) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:792) at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1486) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:96) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1327) at java.security.AccessController.doPrivileged(Native Method) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1426) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:847) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322) at sun.rmi.transport.Transport$1.run(Transport.java:177) at sun.rmi.transport.Transport$1.run(Transport.java:174) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:173) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722) Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> Servlet01 in servlet mapping at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3511) at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3486) at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1452) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1300) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:388) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5606) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145) ... 42 more 二月 28, 2020 12:10:00 下午 org.apache.tomcat.util.modeler.BaseModelMBean invoke SEVERE: Exception invoking method manageApp java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]] at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1022) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:994) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1899) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:792) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:619) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:566) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:792) at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1486) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:96) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1327) at java.security.AccessController.doPrivileged(Native Method) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1426) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:847) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322) at sun.rmi.transport.Transport$1.run(Transport.java:177) at sun.rmi.transport.Transport$1.run(Transport.java:174) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:173) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722) 二月 28, 2020 12:10:00 下午 org.apache.tomcat.util.modeler.BaseModelMBean invoke SEVERE: Exception invoking method createStandardContext javax.management.RuntimeOperationsException: Exception invoking method manageApp at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:309) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:792) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:619) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:566) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:792) at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1486) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:96) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1327) at java.security.AccessController.doPrivileged(Native Method) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1426) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:847) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322) at sun.rmi.transport.Transport$1.run(Transport.java:177) at sun.rmi.transport.Transport$1.run(Transport.java:174) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:173) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722) Caused by: java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]] at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1022) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:994) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1899) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) ... 33 more [2020-02-28 12:10:00,214] Artifact Filter:war exploded: Error during artifact deployment. See server log for details. 二月 28, 2020 12:10:09 下午 org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\manager 二月 28, 2020 12:10:09 下午 org.apache.catalina.startup.HostConfig deployDirectory INFO: Deployment of web application directory C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\manager has finished in 143 ms ```  **上面是异常代码，下面是一部分截图，然后访问jsp页面或servlet页面也不会404，就只是空白页面**
使用c3p0连接池是出现了空指针异常_course
2014-08-09连接不上我的mysql数据库，但是我单独测试又可以连接上，测试代码如下： Connection conn = null; Statement stmt = null; ResultSet rs = null; try { Class.forName("com.mysql.jdbc.Driver"); String url = "jdbc:mysql://localhost:3306/shi"; String name = "root"; String password = "root"; conn = DriverManager.getConnection(url, name, password); String sql = "select * from t_user"; stmt = conn.createStatement(); rs = stmt.executeQuery(sql); while(rs.next()) { String username = rs.getString("name"); System.out.println(username); } } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } finally { if(rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if(stmt != null) { try { stmt.close(); } catch (SQLException e) { e.printStackTrace(); } } if(rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } } 但是使用c3p0的时候就出问题了： c3p0的配置如下： <?xml version="1.0" encoding="UTF-8"?> <c3p0-config> <default-config> <property name="jdbcUrl">jdbc:mysql://localhost:3306/shi?useUnicode=true&characterEncoding=utf8</property> <property name="driverClass">com.mysql.jdbc.Driver</property> <property name="user">root</property> <property name="password">root</property> <!-- <property name="jdbcUrl">jdbc:oracle:thin:@localhost:1521:orcl</property> <property name="driverClass">oracle.jdbc.driver.OracleDriver</property> <property name="user">scott</property> <property name="password">tiger</property> --> <property name="c3p0.testConnectionOnCheckout">true</property> <property name="acquireIncrement">3</property> <property name="initialPoolSize">10</property> <property name="minPoolSize">2</property> <property name="maxPoolSize">10</property> </default-config> </c3p0-config> 出现的异常如下： kate Tom 2014-8-9 9:31:05 com.mchange.v2.log.MLog 信息: MLog clients using java 1.4+ standard logging. 2014-8-9 9:31:06 com.mchange.v2.c3p0.C3P0Registry 信息: Initializing c3p0-0.9.5-pre8 [built 04-April-2014 04:20:15 -0700; debug? true; trace: 10] 2014-8-9 9:31:06 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource 信息: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> 2sa1hd931f5tqer1kt6lht|2c766a24, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> null, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceUseNamedDriverClass -> false, identityToken -> 2sa1hd931f5tqer1kt6lht|2c766a24, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> null, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties -> {}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ] 2014-8-9 9:31:36 com.mchange.v2.resourcepool.BasicResourcePool 警告: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@6c3b78cf -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507) at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476) at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307) at java.sql.DriverManager.getDriver(DriverManager.java:253) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:278) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:158) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:161) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:147) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:200) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1086) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1073) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:44) at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1814) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696) 2014-8-9 9:31:36 com.mchange.v2.resourcepool.BasicResourcePool 警告: Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@5c1fe88d is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests. 2014-8-9 9:31:36 com.mchange.v2.resourcepool.BasicResourcePool 警告: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@53416c84 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507) at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476) at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307) at java.sql.DriverManager.getDriver(DriverManager.java:253) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:278) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:158) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:161) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:147) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:200) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1086) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1073) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:44) at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1814) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696) java.sql.SQLException: Connections could not be acquired from the underlying database! at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:690) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140) at jdbcUtils.JdbcUtils.getConnection(JdbcUtils.java:44) at jdbcUtils.TestUtils.main(TestUtils.java:59) Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source. at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1422) at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:606) at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:526) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:756) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:683) ... 3 more 2014-8-9 9:31:36 com.mchange.v2.resourcepool.BasicResourcePool 警告: Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@5c1fe88d is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests. 2014-8-9 9:31:36 com.mchange.v2.resourcepool.BasicResourcePool 警告: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@58a2353d -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507) at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476) at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307) at java.sql.DriverManager.getDriver(DriverManager.java:253) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:278) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:158) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:161) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:147) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:200) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1086) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1073) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:44) at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1814) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696) 2014-8-9 9:31:36 com.mchange.v2.resourcepool.BasicResourcePool 警告: Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@5c1fe88d is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
定时任务执行一段时间JVM会自动退出问题，急求大神帮忙。_course
2014-05-12最近程序很不稳定，运行一段时间后，JVM会自动退出，急求ITeye大神帮忙看下。 下面是错误日志： # # A fatal error has been detected by the Java Runtime Environment: # # Internal Error (safepoint.cpp:308), pid=16953, tid=139961315587840 # guarantee(PageArmed == 0) failed: invariant # # JRE version: 6.0_31-b04 # Java VM: Java HotSpot(TM) 64-Bit Server VM (20.6-b01 mixed mode linux-amd64 compressed oops) # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp # --------------- T H R E A D --------------- Current thread (0x00007f4b4c070000): VMThread [stack: 0x00007f4b486f7000,0x00007f4b487f8000] [id=16963] Stack: [0x00007f4b486f7000,0x00007f4b487f8000], sp=0x00007f4b487f6b30, free space=1022k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) V [libjvm.so+0x85eba5] VMError::report_and_die()+0x265 V [libjvm.so+0x3e40d6] report_vm_error(char const*, int, char const*, char const*)+0x56 V [libjvm.so+0x783666] SafepointSynchronize::begin()+0x4f6 V [libjvm.so+0x86d01c] VMThread::loop()+0x18c V [libjvm.so+0x86cb2e] VMThread::run()+0x6e V [libjvm.so+0x710bdf] java_start(Thread*)+0x13f VM_Operation (0x00007f4b11fb9380): ParallelGCFailedAllocation, mode: safepoint, requested by thread 0x00007f4b4c90c000 --------------- P R O C E S S --------------- Java Threads: ( => current thread ) 0x00007f4ab8004800 JavaThread "Keep-Alive-Timer" daemon [_thread_blocked, id=5410, stack(0x00007f4a4f3f4000,0x00007f4a4f4f5000)] 0x00007f4ae8014000 JavaThread "FetchRunnable-0" [_thread_blocked, id=5171, stack(0x00007f4a4d5b8000,0x00007f4a4d6b9000)] 0x00007f4b0001a800 JavaThread "Thread-20-EventThread" daemon [_thread_blocked, id=5168, stack(0x00007f4a4e4c7000,0x00007f4a4e5c8000)] 0x00007f4b0001a000 JavaThread "Thread-20-SendThread(mota30.domain:2181)" daemon [_thread_blocked, id=5167, stack(0x00007f4a4cdb0000,0x00007f4a4ceb1000)] 0x00007f4af8005800 JavaThread "Thread-20-EventThread" daemon [_thread_blocked, id=5166, stack(0x00007f4a4ceb1000,0x00007f4a4cfb2000)] 0x00007f4af8010800 JavaThread "Thread-20-SendThread(mota31.domain:2181)" daemon [_thread_blocked, id=5165, stack(0x00007f4a4d6b9000,0x00007f4a4d7ba000)] 0x00007f4adc03f800 JavaThread "Thread-20-EventThread" daemon [_thread_blocked, id=5164, stack(0x00007f4a4dbbe000,0x00007f4a4dcbf000)] 0x00007f4adc03f000 JavaThread "Thread-20-SendThread(mota32.domain:2181)" daemon [_thread_blocked, id=5163, stack(0x00007f4a4e5c8000,0x00007f4a4e6c9000)] 0x00007f4acc01c800 JavaThread "Thread-20-EventThread" daemon [_thread_blocked, id=5162, stack(0x00007f4a4c9ac000,0x00007f4a4caad000)] 0x00007f4acc020000 JavaThread "Thread-20-SendThread(mota31.domain:2181)" daemon [_thread_blocked, id=5161, stack(0x00007f4a4e1c4000,0x00007f4a4e2c5000)] 0x00007f4aa001b000 JavaThread "Thread-20-EventThread" daemon [_thread_blocked, id=5160, stack(0x00007f4a4d8bb000,0x00007f4a4d9bc000)] 0x00007f4aa001a000 JavaThread "Thread-20-SendThread(mota31.domain:2181)" daemon [_thread_blocked, id=5159, stack(0x00007f4a4e2c5000,0x00007f4a4e3c6000)] 0x00007f4ac401e800 JavaThread "Thread-20-EventThread" daemon [_thread_blocked, id=5074, stack(0x00007f4a4ccaf000,0x00007f4a4cdb0000)] 0x00007f4ac401c000 JavaThread "Thread-20-SendThread(mota31.domain:2181)" daemon [_thread_blocked, id=5073, stack(0x00007f4a4dcbf000,0x00007f4a4ddc0000)] 0x00007f4a94073000 JavaThread "MySQL Statement Cancellation Timer" daemon [_thread_blocked, id=17076, stack(0x00007f4a4d0b3000,0x00007f4a4d1b4000)] 0x00007f4aa000a800 JavaThread "Thread-82" daemon [_thread_blocked, id=17075, stack(0x00007f4a4d1b4000,0x00007f4a4d2b5000)] 0x00007f4ab028c800 JavaThread "prism_mota28-1399511679861-89dd70f0_watcher_executor" [_thread_blocked, id=17073, stack(0x00007f4a4d3b6000,0x00007f4a4d4b7000)] 0x00007f4ab0295800 JavaThread "Kafka-consumer-autocommit-0" [_thread_blocked, id=17072, stack(0x00007f4a4d4b7000,0x00007f4a4d5b8000)] 0x00007f4ab0226800 JavaThread "ZkClient-EventThread-101-mota30:2181,mota31:2181,mota32:2181" daemon [_thread_blocked, id=17069, stack(0x00007f4a4d7ba000,0x00007f4a4d8bb000)] 0x00007f4ab01f5800 JavaThread "ZkClient-EventThread-98-mota30:2181,mota31:2181,mota32:2181" daemon [_thread_blocked, id=17066, stack(0x00007f4a4dabd000,0x00007f4a4dbbe000)] 0x00007f4ab01d6800 JavaThread "ZkClient-EventThread-95-mota30:2181,mota31:2181,mota32:2181" daemon [_thread_blocked, id=17063, stack(0x00007f4a4ddc0000,0x00007f4a4dec1000)] 0x00007f4ab01af000 JavaThread "ZkClient-EventThread-92-mota30:2181,mota31:2181,mota32:2181" daemon [_thread_blocked, id=17060, stack(0x00007f4a4e0c3000,0x00007f4a4e1c4000)] 0x00007f4ab007d000 JavaThread "ZkClient-EventThread-89-mota30:2181,mota31:2181,mota32:2181" daemon [_thread_blocked, id=17057, stack(0x00007f4a4e3c6000,0x00007f4a4e4c7000)] 0x00007f4ab0024000 JavaThread "ZkClient-EventThread-86-mota30:2181,mota31:2181,mota32:2181" daemon [_thread_blocked, id=17054, stack(0x00007f4a4e7d1000,0x00007f4a4e8d2000)] 0x00007f4af0019000 JavaThread "Timer-0" daemon [_thread_blocked, id=17045, stack(0x00007f4a4f4f5000,0x00007f4a4f5f6000)] 0x00007f4a98003800 JavaThread "Thread-74" [_thread_blocked, id=17043, stack(0x00007f4a4f8f9000,0x00007f4a4f9fa000)] 0x00007f4a8c03f000 JavaThread "Thread-73" [_thread_blocked, id=17042, stack(0x00007f4a4f9fa000,0x00007f4a4fafb000)] 0x00007f4a80011000 JavaThread "Thread-72" [_thread_blocked, id=17041, stack(0x00007f4a4fafb000,0x00007f4a4fbfc000)] 0x00007f4a84004800 JavaThread "Thread-71" [_thread_blocked, id=17040, stack(0x00007f4a4f6f7000,0x00007f4a4f7f8000)] 0x00007f4a80004000 JavaThread "Thread-69" daemon [_thread_blocked, id=17039, stack(0x00007f4a4f5f6000,0x00007f4a4f6f7000)] 0x00007f4b4c00a800 JavaThread "DestroyJavaVM" [_thread_blocked, id=16954, stack(0x00007f4b51ff0000,0x00007f4b520f1000)] 0x00007f4b4c958000 JavaThread "Thread-64" [_thread_blocked, id=17034, stack(0x00007f4a4f7f8000,0x00007f4a4f8f9000)] 0x00007f4b4c950800 JavaThread "Thread-60" [_thread_blocked, id=17030, stack(0x00007f4a4fbfc000,0x00007f4a4fcfd000)] 0x00007f4b4c94e800 JavaThread "Thread-59" [_thread_blocked, id=17029, stack(0x00007f4a4fcfd000,0x00007f4a4fdfe000)] 0x00007f4b4c94c800 JavaThread "Thread-58" [_thread_blocked, id=17028, stack(0x00007f4a4fdfe000,0x00007f4a4feff000)] 0x00007f4b4c94a800 JavaThread "Thread-57" [_thread_blocked, id=17027, stack(0x00007f4a4feff000,0x00007f4a50000000)] 0x00007f4b4c948800 JavaThread "Thread-56" [_thread_blocked, id=17026, stack(0x00007f4b1009c000,0x00007f4b1019d000)] 0x00007f4b4c946800 JavaThread "Thread-55" [_thread_blocked, id=17025, stack(0x00007f4b1019d000,0x00007f4b1029e000)] 0x00007f4b4c944800 JavaThread "Thread-54" [_thread_blocked, id=17024, stack(0x00007f4b1029e000,0x00007f4b1039f000)] 0x00007f4b4c942800 JavaThread "Thread-53" [_thread_blocked, id=17023, stack(0x00007f4b1039f000,0x00007f4b104a0000)] 0x00007f4b4c940800 JavaThread "Thread-52" [_thread_blocked, id=17022, stack(0x00007f4b104a0000,0x00007f4b105a1000)] 0x00007f4b4c93e800 JavaThread "Thread-51" [_thread_blocked, id=17021, stack(0x00007f4b105a1000,0x00007f4b106a2000)] 0x00007f4b4c93c800 JavaThread "Thread-50" [_thread_blocked, id=17020, stack(0x00007f4b106a2000,0x00007f4b107a3000)] 0x00007f4b4c93a800 JavaThread "Thread-49" [_thread_blocked, id=17019, stack(0x00007f4b107a3000,0x00007f4b108a4000)] 0x00007f4b4c938800 JavaThread "Thread-48" [_thread_blocked, id=17018, stack(0x00007f4b108a4000,0x00007f4b109a5000)] 0x00007f4b4c936800 JavaThread "Thread-47" [_thread_blocked, id=17017, stack(0x00007f4b109a5000,0x00007f4b10aa6000)] 0x00007f4b4c934800 JavaThread "Thread-46" [_thread_blocked, id=17016, stack(0x00007f4b10aa6000,0x00007f4b10ba7000)] 0x00007f4b4c932800 JavaThread "Thread-45" [_thread_blocked, id=17015, stack(0x00007f4b10ba7000,0x00007f4b10ca8000)] 0x00007f4b4c930800 JavaThread "Thread-44" [_thread_blocked, id=17014, stack(0x00007f4b10ca8000,0x00007f4b10da9000)] 0x00007f4b4c92e800 JavaThread "Thread-43" [_thread_in_Java, id=17013, stack(0x00007f4b10da9000,0x00007f4b10eaa000)] 0x00007f4b4c92c800 JavaThread "Thread-42" [_thread_blocked, id=17012, stack(0x00007f4b10eaa000,0x00007f4b10fab000)] 0x00007f4b4c92a800 JavaThread "Thread-41" [_thread_blocked, id=17011, stack(0x00007f4b10fab000,0x00007f4b110ac000)] 0x00007f4b4c928800 JavaThread "Thread-40" [_thread_blocked, id=17010, stack(0x00007f4b110ac000,0x00007f4b111ad000)] 0x00007f4b4c926800 JavaThread "Thread-39" [_thread_blocked, id=17009, stack(0x00007f4b111ad000,0x00007f4b112ae000)] 0x00007f4b4c924800 JavaThread "Thread-38" [_thread_blocked, id=17008, stack(0x00007f4b112ae000,0x00007f4b113af000)] 0x00007f4b4c922800 JavaThread "Thread-37" [_thread_blocked, id=17007, stack(0x00007f4b113af000,0x00007f4b114b0000)] 0x00007f4b4c920800 JavaThread "Thread-36" [_thread_blocked, id=17006, stack(0x00007f4b114b0000,0x00007f4b115b1000)] 0x00007f4b4c91e800 JavaThread "Thread-35" [_thread_blocked, id=17005, stack(0x00007f4b115b1000,0x00007f4b116b2000)] 0x00007f4b4c91c800 JavaThread "Thread-34" [_thread_blocked, id=17004, stack(0x00007f4b116b2000,0x00007f4b117b3000)] 0x00007f4b4c91a800 JavaThread "Thread-33" [_thread_blocked, id=17003, stack(0x00007f4b117b3000,0x00007f4b118b4000)] 0x00007f4b4c918800 JavaThread "Thread-32" [_thread_blocked, id=17002, stack(0x00007f4b118b4000,0x00007f4b119b5000)] 0x00007f4b4c916800 JavaThread "Thread-31" [_thread_blocked, id=17001, stack(0x00007f4b119b5000,0x00007f4b11ab6000)] 0x00007f4b4c914000 JavaThread "Thread-30" [_thread_blocked, id=17000, stack(0x00007f4b11ab6000,0x00007f4b11bb7000)] 0x00007f4b4c912000 JavaThread "Thread-29" [_thread_blocked, id=16999, stack(0x00007f4b11bb7000,0x00007f4b11cb8000)] 0x00007f4b4c910000 JavaThread "Thread-28" [_thread_blocked, id=16998, stack(0x00007f4b11cb8000,0x00007f4b11db9000)] 0x00007f4b4c90e000 JavaThread "Thread-27" [_thread_blocked, id=16997, stack(0x00007f4b11db9000,0x00007f4b11eba000)] 0x00007f4b4c90c000 JavaThread "Thread-26" [_thread_blocked, id=16996, stack(0x00007f4b11eba000,0x00007f4b11fbb000)] 0x00007f4b4c90a000 JavaThread "Thread-25" [_thread_blocked, id=16995, stack(0x00007f4b11fbb000,0x00007f4b120bc000)] 0x00007f4b4c908000 JavaThread "Thread-24" [_thread_blocked, id=16994, stack(0x00007f4b120bc000,0x00007f4b121bd000)] 0x00007f4b4c906000 JavaThread "Thread-23" [_thread_blocked, id=16993, stack(0x00007f4b121bd000,0x00007f4b122be000)] 0x00007f4b4c904000 JavaThread "Thread-22" [_thread_blocked, id=16992, stack(0x00007f4b122be000,0x00007f4b123bf000)] 0x00007f4b4c902800 JavaThread "Thread-21" [_thread_blocked, id=16991, stack(0x00007f4b123bf000,0x00007f4b124c0000)] 0x00007f4b4c900800 JavaThread "Thread-20" [_thread_blocked, id=16990, stack(0x00007f4b124c0000,0x00007f4b125c1000)] 0x00007f4b4c8ff000 JavaThread "Thread-19" [_thread_blocked, id=16989, stack(0x00007f4b125c1000,0x00007f4b126c2000)] 0x00007f4b4c462800 JavaThread "Thread-18" [_thread_blocked, id=16988, stack(0x00007f4b126c2000,0x00007f4b127c3000)] 0x00007f4b4c460800 JavaThread "Thread-17" [_thread_blocked, id=16987, stack(0x00007f4b127c3000,0x00007f4b128c4000)] 0x00007f4b4c45e800 JavaThread "Thread-16" [_thread_blocked, id=16986, stack(0x00007f4b128c4000,0x00007f4b129c5000)] 0x00007f4b4c45d000 JavaThread "Thread-15" [_thread_blocked, id=16985, stack(0x00007f4b129c5000,0x00007f4b12ac6000)] 0x00007f4b4c8d6000 JavaThread "Thread-14" [_thread_blocked, id=16984, stack(0x00007f4b12ac6000,0x00007f4b12bc7000)] 0x00007f4b4c8d4000 JavaThread "Thread-13" [_thread_blocked, id=16983, stack(0x00007f4b12bc7000,0x00007f4b12cc8000)] 0x00007f4b4c8d2800 JavaThread "Thread-12" [_thread_blocked, id=16982, stack(0x00007f4b12cc8000,0x00007f4b12dc9000)] 0x00007f4b4c8d1000 JavaThread "Thread-11" [_thread_blocked, id=16981, stack(0x00007f4b12dc9000,0x00007f4b12eca000)] 0x00007f4b4c8b2800 JavaThread "Thread-10" [_thread_blocked, id=16980, stack(0x00007f4b12eca000,0x00007f4b12fcb000)] 0x00007f4b4c8b1800 JavaThread "Thread-9" [_thread_blocked, id=16979, stack(0x00007f4b12fcb000,0x00007f4b130cc000)] 0x00007f4b4c64c000 JavaThread "Thread-8" [_thread_blocked, id=16978, stack(0x00007f4b130cc000,0x00007f4b131cd000)] 0x00007f4b4c8ae000 JavaThread "Thread-7" [_thread_blocked, id=16977, stack(0x00007f4b131cd000,0x00007f4b132ce000)] 0x00007f4b4c8f2000 JavaThread "Thread-6" [_thread_blocked, id=16976, stack(0x00007f4b132ce000,0x00007f4b133cf000)] 0x00007f4b4c8c3000 JavaThread "Thread-5" [_thread_blocked, id=16975, stack(0x00007f4b133cf000,0x00007f4b134d0000)] 0x00007f4b4c8bf000 JavaThread "Thread-4" [_thread_blocked, id=16974, stack(0x00007f4b134d0000,0x00007f4b135d1000)] 0x00007f4b4c883000 JavaThread "Thread-3" [_thread_blocked, id=16973, stack(0x00007f4b135d1000,0x00007f4b136d2000)] 0x00007f4b4c8e0800 JavaThread "Thread-2" [_thread_blocked, id=16972, stack(0x00007f4b136d2000,0x00007f4b137d3000)] 0x00007f4b4c467000 JavaThread "Thread-1" [_thread_blocked, id=16971, stack(0x00007f4b137d3000,0x00007f4b138d4000)] 0x00007f4b4c09c000 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=16969, stack(0x00007f4b13eff000,0x00007f4b14000000)] 0x00007f4b4c099800 JavaThread "C2 CompilerThread1" daemon [_thread_blocked, id=16968, stack(0x00007f4b48069000,0x00007f4b4816a000)] 0x00007f4b4c096800 JavaThread "C2 CompilerThread0" daemon [_thread_blocked, id=16967, stack(0x00007f4b4816a000,0x00007f4b4826b000)] 0x00007f4b4c094800 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=16966, stack(0x00007f4b4826b000,0x00007f4b4836c000)] 0x00007f4b4c078800 JavaThread "Finalizer" daemon [_thread_blocked, id=16965, stack(0x00007f4b484f5000,0x00007f4b485f6000)] 0x00007f4b4c076800 JavaThread "Reference Handler" daemon [_thread_blocked, id=16964, stack(0x00007f4b485f6000,0x00007f4b486f7000)] Other Threads: =>0x00007f4b4c070000 VMThread [stack: 0x00007f4b486f7000,0x00007f4b487f8000] [id=16963] 0x00007f4b4c0ae800 WatcherThread [stack: 0x00007f4b13dfe000,0x00007f4b13eff000] [id=16970] VM state:synchronizing (normal execution) VM Mutex/Monitor currently owned by a thread: ([mutex/lock_event]) [0x00007f4b4c0071f0] Safepoint_lock - owner thread: 0x00007f4b4c070000 [0x00007f4b4c007270] Threads_lock - owner thread: 0x00007f4b4c070000 [0x00007f4b4c007770] Heap_lock - owner thread: 0x00007f4b4c90c000 Heap PSYoungGen total 613504K, used 544384K [0x00000007d6560000, 0x00000007ffe80000, 0x0000000800000000) eden space 544384K, 100% used [0x00000007d6560000,0x00000007f7900000,0x00000007f7900000) from space 69120K, 0% used [0x00000007f7900000,0x00000007f7900000,0x00000007fbc80000) to space 67200K, 0% used [0x00000007fbce0000,0x00000007fbce0000,0x00000007ffe80000) PSOldGen total 440320K, used 197954K [0x0000000783000000, 0x000000079de00000, 0x00000007d6560000) object space 440320K, 44% used [0x0000000783000000,0x000000078f150960,0x000000079de00000) PSPermGen total 65792K, used 42880K [0x000000077de00000, 0x0000000781e40000, 0x0000000783000000) object space 65792K, 65% used [0x000000077de00000,0x00000007807e00e0,0x0000000781e40000) Code Cache [0x00007f4b49000000, 0x00007f4b49a20000, 0x00007f4b4c000000) total_blobs=3270 nmethods=2829 adapters=393 free_code_cache=39915648 largest_free_block=25536 Dynamic libraries: 40000000-40009000 r-xp 00000000 08:02 1680687 /usr/lib/jvm/j2sdk1.6-oracle/bin/java 40108000-4010a000 rwxp 00008000 08:02 1680687 /usr/lib/jvm/j2sdk1.6-oracle/bin/java 41c2b000-41d12000 rwxp 00000000 00:00 0 [heap] 77de00000-781e40000 rwxp 00000000 00:00 0 781e40000-782d80000 ---p 00000000 00:00 0 782d80000-783000000 rwxp 00000000 00:00 0 783000000-79de00000 rwxp 00000000 00:00 0 79de00000-7d6560000 rwxp 00000000 00:00 0 7d6560000-7ffe80000 rwxp 00000000 00:00 0 7ffe80000-800000000 ---p 00000000 00:00 0 7f4a44000000-7f4a45217000 rwxp 00000000 00:00 0 7f4a45217000-7f4a48000000 ---p 00000000 00:00 0 7f4a48000000-7f4a4823d000 rwxp 00000000 00:00 0 7f4a4823d000-7f4a4c000000 ---p 00000000 00:00 0 7f4a4c8ab000-7f4a4c8ae000 ---p 00000000 00:00 0 7f4a4c8ae000-7f4a4c9ac000 rwxp 00000000 00:00 0 7f4a4c9ac000-7f4a4c9af000 ---p 00000000 00:00 0 7f4a4c9af000-7f4a4caad000 rwxp 00000000 00:00 0 7f4a4caad000-7f4a4cab0000 ---p 00000000 00:00 0 7f4a4cab0000-7f4a4cbae000 rwxp 00000000 00:00 0 7f4a4cbae000-7f4a4cbb1000 ---p 00000000 00:00 0 7f4a4cbb1000-7f4a4ccaf000 rwxp 00000000 00:00 0 7f4a4ccaf000-7f4a4ccb2000 ---p 00000000 00:00 0 7f4a4ccb2000-7f4a4cdb0000 rwxp 00000000 00:00 0 7f4a4cdb0000-7f4a4cdb3000 ---p 00000000 00:00 0 7f4a4cdb3000-7f4a4ceb1000 rwxp 00000000 00:00 0 7f4a4ceb1000-7f4a4ceb4000 ---p 00000000 00:00 0 7f4a4ceb4000-7f4a4cfb2000 rwxp 00000000 00:00 0 7f4a4cfb2000-7f4a4cfb5000 ---p 00000000 00:00 0 7f4a4cfb5000-7f4a4d0b3000 rwxp 00000000 00:00 0 7f4a4d0b3000-7f4a4d0b6000 ---p 00000000 00:00 0 7f4a4d0b6000-7f4a4d1b4000 rwxp 00000000 00:00 0 7f4a4d1b4000-7f4a4d1b7000 ---p 00000000 00:00 0 7f4a4d1b7000-7f4a4d2b5000 rwxp 00000000 00:00 0 7f4a4d2b5000-7f4a4d2b8000 ---p 00000000 00:00 0 7f4a4d2b8000-7f4a4d3b6000 rwxp 00000000 00:00 0 7f4a4d3b6000-7f4a4d3b9000 ---p 00000000 00:00 0 7f4a4d3b9000-7f4a4d4b7000 rwxp 00000000 00:00 0 7f4a4d4b7000-7f4a4d4ba000 ---p 00000000 00:00 0 7f4a4d4ba000-7f4a4d5b8000 rwxp 00000000 00:00 0 7f4a4d5b8000-7f4a4d5bb000 ---p 00000000 00:00 0 7f4a4d5bb000-7f4a4d6b9000 rwxp 00000000 00:00 0 7f4a4d6b9000-7f4a4d6bc000 ---p 00000000 00:00 0 7f4a4d6bc000-7f4a4d7ba000 rwxp 00000000 00:00 0 7f4a4d7ba000-7f4a4d7bd000 ---p 00000000 00:00 0 7f4a4d7bd000-7f4a4d8bb000 rwxp 00000000 00:00 0 7f4a4d8bb000-7f4a4d8be000 ---p 00000000 00:00 0 7f4a4d8be000-7f4a4d9bc000 rwxp 00000000 00:00 0 7f4a4d9bc000-7f4a4d9bf000 ---p 00000000 00:00 0 7f4a4d9bf000-7f4a4dabd000 rwxp 00000000 00:00 0 7f4a4dabd000-7f4a4dac0000 ---p 00000000 00:00 0 7f4a4dac0000-7f4a4dbbe000 rwxp 00000000 00:00 0 7f4a4dbbe000-7f4a4dbc1000 ---p 00000000 00:00 0 7f4a4dbc1000-7f4a4dcbf000 rwxp 00000000 00:00 0 7f4a4dcbf000-7f4a4dcc2000 ---p 00000000 00:00 0 7f4a4dcc2000-7f4a4ddc0000 rwxp 00000000 00:00 0 7f4a4ddc0000-7f4a4ddc3000 ---p 00000000 00:00 0 7f4a4ddc3000-7f4a4dec1000 rwxp 00000000 00:00 0 7f4a4dec1000-7f4a4dec4000 ---p 00000000 00:00 0 7f4a4dec4000-7f4a4dfc2000 rwxp 00000000 00:00 0 7f4a4dfc2000-7f4a4dfc5000 ---p 00000000 00:00 0 7f4a4dfc5000-7f4a4e0c3000 rwxp 00000000 00:00 0 7f4a4e0c3000-7f4a4e0c6000 ---p 00000000 00:00 0 7f4a4e0c6000-7f4a4e1c4000 rwxp 00000000 00:00 0 7f4a4e1c4000-7f4a4e1c7000 ---p 00000000 00:00 0 7f4a4e1c7000-7f4a4e2c5000 rwxp 00000000 00:00 0 7f4a4e2c5000-7f4a4e2c8000 ---p 00000000 00:00 0 7f4a4e2c8000-7f4a4e3c6000 rwxp 00000000 00:00 0 7f4a4e3c6000-7f4a4e3c9000 ---p 00000000 00:00 0 7f4a4e3c9000-7f4a4e4c7000 rwxp 00000000 00:00 0 7f4a4e4c7000-7f4a4e4ca000 ---p 00000000 00:00 0 7f4a4e4ca000-7f4a4e5c8000 rwxp 00000000 00:00 0 7f4a4e5c8000-7f4a4e5cb000 ---p 00000000 00:00 0 7f4a4e5cb000-7f4a4e6c9000 rwxp 00000000 00:00 0 7f4a4e6c9000-7f4a4e6d0000 r-xp 00000000 08:02 1680052 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libnio.so 7f4a4e6d0000-7f4a4e7cf000 ---p 00007000 08:02 1680052 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libnio.so 7f4a4e7cf000-7f4a4e7d1000 rwxp 00006000 08:02 1680052 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libnio.so 7f4a4e7d1000-7f4a4e7d4000 ---p 00000000 00:00 0 7f4a4e7d4000-7f4a4e8d2000 rwxp 00000000 00:00 0 7f4a4e8d2000-7f4a4e8d8000 r-xp 00000000 08:02 1680007 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libmanagement.so 7f4a4e8d8000-7f4a4e9d7000 ---p 00006000 08:02 1680007 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libmanagement.so 7f4a4e9d7000-7f4a4e9d9000 rwxp 00005000 08:02 1680007 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libmanagement.so 7f4a4e9d9000-7f4a4e9f1000 r-xp 00000000 08:02 1490969 /lib/x86_64-linux-gnu/libresolv-2.15.so 7f4a4e9f1000-7f4a4ebf1000 ---p 00018000 08:02 1490969 /lib/x86_64-linux-gnu/libresolv-2.15.so 7f4a4ebf1000-7f4a4ebf2000 r-xp 00018000 08:02 1490969 /lib/x86_64-linux-gnu/libresolv-2.15.so 7f4a4ebf2000-7f4a4ebf3000 rwxp 00019000 08:02 1490969 /lib/x86_64-linux-gnu/libresolv-2.15.so 7f4a4ebf3000-7f4a4ebf5000 rwxp 00000000 00:00 0 7f4a4ebf5000-7f4a4ebfc000 r-xp 00000000 08:02 1490981 /lib/x86_64-linux-gnu/libnss_dns-2.15.so 7f4a4ebfc000-7f4a4edfb000 ---p 00007000 08:02 1490981 /lib/x86_64-linux-gnu/libnss_dns-2.15.so 7f4a4edfb000-7f4a4edfc000 r-xp 00006000 08:02 1490981 /lib/x86_64-linux-gnu/libnss_dns-2.15.so 7f4a4edfc000-7f4a4edfd000 rwxp 00007000 08:02 1490981 /lib/x86_64-linux-gnu/libnss_dns-2.15.so 7f4a4edfd000-7f4a4ee02000 r-xp 00000000 08:02 1680013 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/headless/libmawt.so 7f4a4ee02000-7f4a4ef01000 ---p 00005000 08:02 1680013 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/headless/libmawt.so 7f4a4ef01000-7f4a4ef03000 rwxp 00004000 08:02 1680013 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/headless/libmawt.so 7f4a4ef03000-7f4a4ef95000 r-xp 00000000 08:02 1680009 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libawt.so 7f4a4ef95000-7f4a4f094000 ---p 00092000 08:02 1680009 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libawt.so 7f4a4f094000-7f4a4f0ae000 rwxp 00091000 08:02 1680009 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libawt.so 7f4a4f0ae000-7f4a4f0d2000 rwxp 00000000 00:00 0 7f4a4f15c000-7f4a4f2dd000 rwxp 00000000 00:00 0 7f4a4f2dd000-7f4a4f2f0000 r-xp 00000000 08:02 1680053 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libnet.so 7f4a4f2f0000-7f4a4f3f1000 ---p 00013000 08:02 1680053 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libnet.so 7f4a4f3f1000-7f4a4f3f4000 rwxp 00014000 08:02 1680053 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/libnet.so 7f4a4f3f4000-7f4a4f3f7000 ---p 00000000 00:00 0 7f4a4f3f7000-7f4a4f4f5000 rwxp 00000000 00:00 0 7f4a4f4f5000-7f4a4f4f8000 ---p 00000000 00:00 0 7f4a4f4f8000-7f4a4f5f6000 rwxp 00000000 00:00 0 7f4a4f5f6000-7f4a4f5f9000 ---p 00000000 00:00 0 7f4a4f5f9000-7f4a4f6f7000 rwxp 00000000 00:00 0 7f4a4f6f7000-7f4a4f6fa000 ---p 00000000 00:00 0 7f4a4f6fa000-7f4a4f7f8000 rwxp 00000000 00:00 0 7f4a4f7f8000-7f4a4f7fb000 ---p 00000000 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7f4b53819000-7f4b53842000 rwxp 00000000 00:00 0 7f4b53842000-7f4b538d9000 rwxp 00000000 00:00 0 7f4b538d9000-7f4b538e1000 rwxs 00000000 08:02 2367662 /tmp/hsperfdata_mota/16953 7f4b538e1000-7f4b538e4000 rwxp 00000000 00:00 0 7f4b538e4000-7f4b538eb000 r-xp 00000000 08:02 1680058 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/jli/libjli.so 7f4b538eb000-7f4b539ec000 ---p 00007000 08:02 1680058 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/jli/libjli.so 7f4b539ec000-7f4b539ee000 rwxp 00008000 08:02 1680058 /usr/lib/jvm/j2sdk1.6-oracle/jre/lib/amd64/jli/libjli.so 7f4b539ee000-7f4b539ef000 rwxp 00000000 00:00 0 7f4b539ef000-7f4b539f0000 r-xs 00005000 08:02 1982520 /home/mota/usr/prism/client/lib/forumfetcher-0.0.8.jar 7f4b539f0000-7f4b539f2000 r-xs 0000e000 08:02 1982538 /home/mota/usr/prism/client/lib/activation-1.1.jar 7f4b539f2000-7f4b539f3000 rwxp 00000000 00:00 0 7f4b539f3000-7f4b539f4000 ---p 00000000 00:00 0 7f4b539f4000-7f4b539f6000 rwxp 00000000 00:00 0 7f4b539f6000-7f4b539f7000 r-xp 00022000 08:02 1490966 /lib/x86_64-linux-gnu/ld-2.15.so 7f4b539f7000-7f4b539f9000 rwxp 00023000 08:02 1490966 /lib/x86_64-linux-gnu/ld-2.15.so 7fffdde20000-7fffdde43000 rwxp 00000000 00:00 0
resultSet.getString( )搜索数据库方法问题_course
2017-05-17package com.buy.bean.coin; import java.sql.Connection; import java.sql.ResultSet; import java.sql.Statement; import com.buy.bean.comm.database.DBConnect; public class UsercoinSelectBean { //查询用户信息的方法 public String selectUsercoin(String ID, int i) { //声明查询语句的字符串类型变量 String condition = null; if(i == 0) { //如果参数i为0表示查询用户电子货币余额 condition = "select coin from user where id = " + ID; } else if(i == 1) { //如果参数i为1表示查询用户已花费的电子货币 condition = "select consume from user where id = " + ID; } else if(i == 2) { //如果参数i为2表示查询用户累计的电子货币 condition = "select coin + consume from user where id = " + ID; } else if(i == 3) { //如果参数i为3表示查询用户的姓名 condition = "select name from user where id = " + ID; } else if(i == 4) { //如果参数i为4表示查询用户的类型 condition = "select type from user where id = " + ID; } ResultSet rs = null; Statement sql = null; String str = new String(); try { int coin; //获得数据库连接 Connection conn = DBConnect.getConnection(); //建立Statement sql = conn.createStatement(); //执行数据库查询 rs = sql.executeQuery(condition); //取结果集记录中的第一个字符 while(rs.next()) { str = rs.getString(1); } //将取得的字符串转化成整型 coin = Integer.parseInt(str); //关闭结果集 rs.close(); //关闭Statement sql.close(); //关闭连接 conn.close(); } catch (Exception e) { //如果查询错误 return new String("can not select"); } //返回结果 return str; } } ``` ``` 用resultSet.getString( )方法 name和type都是varchar类型的 前面几个整型都能打印出来 varchar类型的打印不出来 查询语句正常 放入数据库里能检索到 求教什么问题。
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2019-01-10比如有一个表存放用户信息 一个表存放留言信息 其中定义外键为用户的id 当要删除用户的时候 怎么用JDBC来实现删除用户以及他对应的留言。
springboot程序不能启动_course
2019-03-152019-03-15 16:50:33.588 INFO 12140 --- [ main] c.h.s.SpringBoot01Application : Starting SpringBoot01Application on DESKTOP-QUO396V with PID 12140 (F:\Ideal\spring-boot-01\target\classes started by PC in F:\Ideal\spring-boot-01) 2019-03-15 16:50:33.635 INFO 12140 --- [ main] c.h.s.SpringBoot01Application : No active profile set, falling back to default profiles: default 2019-03-15 16:50:35.666 INFO 12140 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2019-03-15 16:50:35.744 INFO 12140 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2019-03-15 16:50:35.744 INFO 12140 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.16] 2019-03-15 16:50:35.744 INFO 12140 --- [ main] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [E:\JDK\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;E:\xftp\;E:\xshell\;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;E:\JDK\bin;E:\mysql-8.0.14-winx64\mysql-8.0.14-winx64\bin;E:\apache-maven-3.3.9\bin;E:\git\Git\cmd;C:\Users\PC\AppData\Local\Microsoft\WindowsApps;C:\Users\PC\AppData\Local\Pandoc\;.] 2019-03-15 16:50:36.073 INFO 12140 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2019-03-15 16:50:36.073 INFO 12140 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2391 ms 2019-03-15 16:50:36.307 INFO 12140 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor' 2019-03-15 16:50:36.541 INFO 12140 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '' 2019-03-15 16:50:36.572 INFO 12140 --- [ main] c.h.s.SpringBoot01Application : Started SpringBoot01Application in 3.702 seconds (JVM running for 6.318) 为什么springboot程序启动不起来
存储过程一直锁临时表，对这个临时表只有insert操作而且直插入几万条数据？怎么解决_course
2019-05-07对这个临时表只有insert操作而且直插入几万条数据？怎么解决
为什么数据库的左外连接查询特别慢？_course
2019-04-25就查了7条记录就要2秒钟，绝对不能忍，用内连接很快，为什么用左外连接就慢成蜗牛。 查询语句： ``` explain select * from ( select * from device where enterprise_id in ( select enterprise_id from user_enterprise where user_id = 1 ) ) t1 left join ( select * from device_data where device_data_id in ('139212', '139295', '142934', '142935') ) t2 using(device_id) ``` 表结构：  explain结果： 
24.46MB图书管理系统（Java + Mysql）我的第一个完全自己做的实训项目
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专为程序员设计的数学课_course
2019-11-11<p> 限时福利限时福利，<span>15000+程序员的选择！</span> </p> <p> 购课后添加学习助手（微信号：csdn590），按提示消息领取编程大礼包！并获取讲师答疑服务！ </p> <p> <br> </p> <p> 套餐中一共包含5门程序员必学的数学课程（共47讲） </p> <p> 课程1：《零基础入门微积分》 </p> <p> 课程2：《数理统计与概率论》 </p> <p> 课程3：《代码学习线性代数》 </p> <p> 课程4：《数据处理的最优化》 </p> <p> 课程5：《马尔可夫随机过程》 </p> <p> <br> </p> <p> 哪些人适合学习这门课程？ </p> <p> 1）大学生，平时只学习了数学理论，并未接触如何应用数学解决编程问题； </p> <p> 2）对算法、数据结构掌握程度薄弱的人，数学可以让你更好的理解算法、数据结构原理及应用； </p> <p> 3）看不懂大牛代码设计思想的人，因为所有的程序设计底层逻辑都是数学； </p> <p> 4）想学习新技术，如：人工智能、机器学习、深度学习等，这门课程是你的必修课程； </p> <p> 5）想修炼更好的编程内功，在遇到问题时可以灵活的应用数学思维解决问题。 </p> <p> <br> </p> <p> 在这门「专为程序员设计的数学课」系列课中，我们保证你能收获到这些:<br> <br> <span> </span> </p> <p class="ql-long-24357476"> <span class="ql-author-24357476">①价值300元编程课程大礼包</span> </p> <p class="ql-long-24357476"> <span class="ql-author-24357476">②应用数学优化代码的实操方法</span> </p> <p class="ql-long-24357476"> <span class="ql-author-24357476">③数学理论在编程实战中的应用</span> </p> <p class="ql-long-24357476"> <span class="ql-author-24357476">④程序员必学的5大数学知识</span> </p> <p class="ql-long-24357476"> <span class="ql-author-24357476">⑤人工智能领域必修数学课</span> </p> <p> <br> 备注：此课程只讲程序员所需要的数学，即使你数学基础薄弱，也能听懂，只需要初中的数学知识就足矣。<br> <br> 如何听课？ </p> <p> 1、登录CSDN学院 APP 在我的课程中进行学习； </p> <p> 2、登录CSDN学院官网。 </p> <p> <br> </p> <p> 购课后如何领取免费赠送的编程大礼包和加入答疑群？ </p> <p> 购课后，添加助教微信：<span> csdn590</span>，按提示领取编程大礼包，或观看付费视频的第一节内容扫码进群答疑交流！ </p> <p> <img src="https://img-bss.csdn.net/201912251155398753.jpg" alt=""> </p>
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3KB谷粒商城-2020.5月最新升级全套版-基础+高级+高可用集群
2020-07-16谷粒商城-2020.5月最新升级-全套版-基础+高级+高可用集群，已完结！
程序员的MySQL学习宝典_course
2020-06-22<p> 程序员的必经之路！ </p> <p> 【限时优惠】 </p> <p> <br> </p> <p> 现在下单，还享四重好礼：<br> 1、教学课件免费下载<br> 2、课程案例代码免费下载<br> 3、专属VIP学员群免费答疑<br> 4、下单还送800元编程大礼包 </p> <p> <br> </p> <p> 【超实用课程内容】 </p> <p> 根据《2019-2020年中国开发者调查报告》显示，超83%的开发者都在使用MySQL数据库。使用量大同时，掌握MySQL早已是运维、DBA的必备技能，甚至部分IT开发岗位也要求对数据库使用和原理有深入的了解和掌握。 学习编程，你可能会犹豫选择 C++ 还是 Java；入门数据科学，你可能会纠结于选择 Python 还是 R；但无论如何， MySQL 都是 IT 从业人员不可或缺的技能！ </p> <p> <br> </p> <p> 套餐中一共包含2门MySQL数据库必学的核心课程（共98课时） </p> <p> 课程1：《MySQL数据库从入门到实战应用》 </p> <p> 课程2：《高性能MySQL实战课》 </p> <p> <br> </p> <p> 【哪些人适合学习这门课程？】 </p> <p> 1）平时只接触了语言基础，并未学习任何数据库知识的人； </p> <p> 2）对MySQL掌握程度薄弱的人，课程可以让你更好发挥MySQL最佳性能； </p> <p> 3）想修炼更好的MySQL内功，工作中遇到高并发场景可以游刃有余； </p> <p> 4）被面试官打破沙锅问到底的问题问到怀疑人生的应聘者。 </p> <p> <br> </p> <p> 【课程主要讲哪些内容？】 </p> <p> 课程一：<span>《MySQL数据库从入门到实战应用》 主要从基础篇，SQL语言篇、MySQL进阶篇三个角度展开讲解，帮助大家更加高效的管理MySQL数据库。</span> </p> <p> <br> </p> <p> <img src="https://img-bss.csdnimg.cn/202006261532354009.png" alt=""> </p> <p> <br> </p> <p> 课程二：《高性能MySQL实战课》主要从高可用篇、MySQL8.0新特性篇，性能优化篇，面试篇四个角度展开讲解，帮助大家<span>发挥MySQL的最佳性能的优化方法，<span>掌握如何处理海量业务数据和高并发请求</span></span> </p> <p> <br> </p> <p> <img src="https://img-bss.csdnimg.cn/202006261533103261.png" alt=""> </p> <p> <br> </p> <p> 【你能收获到什么？】 </p> <p> 1.基础再提高，针对MySQL核心知识点学透，用对； </p> <p> 2.能力再提高，日常工作中的代码换新貌，不怕问题； </p> <p> 3.面试再加分，巴不得面试官打破沙锅问到底，竞争力MAX。 </p> <p> <br> </p> <p> 【课程如何观看？】 </p> <p> 1、登录CSDN学院 APP 在我的课程中进行学习； </p> <p> 2、移动端：CSDN 学院APP（注意不是CSDN APP哦） </p> <p> 本课程为录播课，课程永久有效观看时长 【资料开放】 课件、课程案例代码完全开放给你，你可以根据所学知识，自行修改、优化。 </p> <p> 下载方式：电脑登录课程观看页面，点击右侧课件，可进行课程资料的打包下载。 </p>
111.65MBDirectX修复工具V4.0增强版
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