SpringBoot框架,项目刚启动的时候没事,过一段时间就开始报错了

报错内容
我在网上查了一下,说是:如果一个DB连接在无任何操作情况下过了8个小时后(Mysql 服务器默认的“wait_timeout”是8小时),Mysql会自动把这个连接关闭;我就在配置文件中增加了些:但是还是没用:增加的

3个回答

可以尝试在数据量连接的url上添加

 autoReconnect=true

具体原因参考以下两个链接

http://blog.csdn.net/u014398624/article/details/47746473

https://stackoverflow.com/questions/32944222/no-operations-allowed-after-connection-closed-on-mysql

sun1021873926
夕阳雨晴 推荐阿里的数据库连接池com.alibaba.druid.pool.DruidDataSource,如果有帮助的话请采纳。
接近 2 年之前 回复
weixin_38290853
weixin_38290853 我换了一个连接池,让项目跑到明天,看看有没有问题,谢谢您!
接近 2 年之前 回复

MySQL的数据库连接有8个小时的idle。会自动断开,你需要进行重连处理

weixin_38290853
weixin_38290853 您好,我也知道是这个原因,我SpringBoot用的是 tomcat连接池,然后我就按照网上说的那样,但是还是不行啊!是不是需要再换一个连接池呢?
接近 2 年之前 回复

原因很简单。在对数据库操作结束后关闭连接是正确的做法,没什么大问题。至于出现:No operations allowed after connection closed。这样的问题原因只有一个,你这里和数据库的连接Connection是一个Static的,程序共享这一个Connection。所以第一次对数据库操作没问题,当把Connection关闭后,第二次还想操作数据库时Connection肯定不存在了。
http://bbs.csdn.net/topics/350157841

weixin_38290853
weixin_38290853 我就喜欢你一本正经的胡说八道!
接近 2 年之前 回复
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ps = conn.prepareStatement("select * from customer");在执行这条语句的时候一切正常输出rn //select top ? customercode, customername, phone, address, relationman,other from customer where customercode not in(select top ? customercode from customer) 但是执行这条语句却报出下面的错误rn //ps.setInt(1,page.getBeginIndex() ); page.getBeginIndex()=0;rn //ps.setInt(2,page.getEveryPage() ); page.getEveryPage()=5rn rs= ps.executeQuery();rnrnrncom.microsoft.sqlserver.jdbc.SQLServerException: '@P0' 附近有语法错误。rn at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:197)rn at com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(SQLServerStatement.java:1493)rn at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePreparedStatement(SQLServerPreparedStatement.java:390)rn at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PrepStmtExecCmd.doExecute(SQLServerPreparedStatement.java:340)rn at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:4575)rn at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:1400)rn at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeCommand(SQLServerStatement.java:179)rn at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeStatement(SQLServerStatement.java:154)rn at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeQuery(SQLServerPreparedStatement.java:283)rn at com.BeifengQuote.DaoImpl.CustomerDaoImpl.findCustomerAll(CustomerDaoImpl.java:215)rn at com.BeifengQuote.Action.CustomerFindAllAction.execute(CustomerFindAllAction.java:23)rn at com.BeifengQuote.Servlet.WebContral.doPost(WebContral.java:57)rn at com.BeifengQuote.Servlet.WebContral.doGet(WebContral.java:40)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)rn at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)rn at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)rn at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)rn at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)rn at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)rn at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)rn at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)rn at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)rn at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)rn at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)rn at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)rn at java.lang.Thread.run(Thread.java:619)rnrn这是什么错误呀??
程序运行到“cn.open();” 就报错了
using System;rnusing System.Collections;rnusing System.ComponentModel;rnusing System.Data;rnusing System.Drawing;rnusing System.Web;rnusing System.Web.SessionState;rnusing System.Web.UI;rnusing System.Web.UI.WebControls;rnusing System.Web.UI.HtmlControls;rnusing System.Configuration;rnusing System.Data.SqlClient;rnrnrnnamespace TMSrnrnrn public class _Default : System.Web.UI.Pagern rn protected System.Web.UI.WebControls.TextBox tbx_uid;rn protected System.Web.UI.WebControls.TextBox tbx_upassword;rn protected System.Web.UI.WebControls.Button btn_login;rn protected System.Web.UI.WebControls.Label lbl_message;rn rn private void Page_Load(object sender, System.EventArgs e)rn rn // 在此处放置用户代码以初始化页面rn rn private void btn_login_Click(object sender, System.EventArgs e)rn rn rn string strconn= ConfigurationSettings.AppSettings["dsn"];rn rn SqlConnection cn= new SqlConnection (strconn);rnrn cn.Open ();rn rn string mysql= "select * from Users where Uid='"+tbx_uid.Text +"' and UPassword='"+tbx_upassword.Text +"'";rn rn SqlCommand cm=new SqlCommand (mysql,cn);rn rn SqlDataReader dr=cm.ExecuteReader ();rn if(dr.Read ())rn rn lbl_message.Text= "";rn rn Session["uid"]=dr["uid"].ToString ();rn Session["upower"]=dr["upower"].ToString ();rn lbl_message.Text="欢迎您!"+Session["uid"];rn if(Session["upower"].ToString ()=="1") rn rn Response.Redirect ("contractcount.aspx");rn rn else if(Session["upower"].ToString ()=="2") rn rn Response.Redirect ("contractlist.aspx");rn rn rn elsern rn lbl_message.Text ="对不起,您的用户名/密码不正确,请重新输入";rn rn //关闭连接rn cn.Close();rnrnrnrnrnrnweb.config代码:rnrn rn rnrnrnrn rnrnrn
hello world就报错了
安装完android studio,按照官方的开发流程新建了hello world,第一次运行很好,无任何错误。第二天开机后直接点运行然后出现红色提示如下:rnE/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRenderingrnrngoogle了下,说是模拟机版本太低,可问题是我第一次运行是没有错误啊,确定翻看过,而关机后再运行居然就有了。rnrn烦请指点下,谢谢了。rnrnrn截图:rn[img=https://img-bbs.csdn.net/upload/201702/13/1486983392_190144.png][/img]
启动oracle是报错了
我在启动oracle报了下面的错误rnrnjava.lang.NullPointerExceptionrn at oracle.ewt.lwAWT.BufferedApplet.(Unknown Source)rn at oracle.net.ca.NetCA.(Unknown Source)rn at oracle.net.ca.NetCA.main(Unknown Source)rnOracle Net Services configuration failed. The exit code is -1rnrn各位大虾该怎么解决阿
多对多关系的时候,报错了
报错:rnException in thread "main" org.springframework.orm.hibernate3.HibernateSystemException: illegal access to loading collection; nested exception is org.hibernate.LazyInitializationException: illegal access to loading collectionrnCaused by: org.hibernate.LazyInitializationException: illegal access to loading collectionrn at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:341)rn at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)rn at org.hibernate.collection.PersistentSet.hashCode(PersistentSet.java:411)rn at wind.rose.crm.entity.Product.hashCode(Product.java:74)rn at java.util.HashMap.put(HashMap.java:372)rn at java.util.HashSet.add(HashSet.java:200)rn at java.util.AbstractCollection.addAll(AbstractCollection.java:305)rn at org.hibernate.collection.PersistentSet.endRead(PersistentSet.java:329)rn at org.hibernate.engine.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:183)rn at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:268)rn at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:249)rn at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:866)rn at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:853)rn at org.hibernate.loader.Loader.doQuery(Loader.java:717)rn at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)rn at org.hibernate.loader.Loader.loadCollection(Loader.java:1985)rn at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:36)rn at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)rn at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)rn at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)rn at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344)rn at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)rn at org.hibernate.collection.PersistentSet.hashCode(PersistentSet.java:411)rn at wind.rose.crm.entity.Order.hashCode(Order.java:79)rn at java.util.HashMap.put(HashMap.java:372)rn at java.util.HashSet.add(HashSet.java:200)rn at java.util.AbstractCollection.addAll(AbstractCollection.java:305)rn at org.hibernate.collection.PersistentSet.endRead(PersistentSet.java:329)rn at org.hibernate.engine.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:183)rn at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:268)rn at org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:249)rn at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:866)rn at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:853)rn at org.hibernate.loader.Loader.doQuery(Loader.java:717)rn at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)rn at org.hibernate.loader.Loader.loadCollection(Loader.java:1985)rn at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:36)rn at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565)rn at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)rn at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716)rn at org.hibernate.collection.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:454)rn at org.hibernate.engine.StatefulPersistenceContext.initializeNonLazyCollections(StatefulPersistenceContext.java:755)rn at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:229)rn at org.hibernate.loader.Loader.doList(Loader.java:2211)rn at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2095)rn at org.hibernate.loader.Loader.list(Loader.java:2090)rn at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:388)rn at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)rn at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)rn at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)rn at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)rn at org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:857)rn at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:366)rn at org.springframework.orm.hibernate3.HibernateTemplate.findByNamedParam(HibernateTemplate.java:848)rn at org.springframework.orm.hibernate3.HibernateTemplate.findByNamedParam(HibernateTemplate.java:839)rn at wind.rose.crm.customer.persist.impl.OrderDaoImpl.findProductByName(OrderDaoImpl.java:27)rn at wind.rose.crm.customer.service.impl.OrderServiceImpl.findByProductName(OrderServiceImpl.java:42)rn at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)rn at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)rn at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)rn at java.lang.reflect.Method.invoke(Method.java:597)rn at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:288)rn at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:181)rn at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)rn at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:100)rn at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)rn at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)rn at $Proxy10.findByProductName(Unknown Source)rn at test.Test.main(Test.java:54)rn
换到eclipse就报错了
不知道为什么会报这个错误,在myeclipse下完全没有错误,换到eclipse报错了rnrn[code=java]package org.mopon.demo1;rnrnimport javax.annotation.PostConstruct;rnimport javax.annotation.PreDestroy;rnimport javax.sql.DataSource;rnrnimport org.springframework.beans.factory.annotation.Autowired;rnimport org.springframework.context.annotation.Scope;rnimport org.springframework.stereotype.Repository;rnrn@Repository("userDao")//用来标注访问层rn@Scope("prototype")//用来保证每次有访问都会创建一个不同的对象 因为spring中的bean默认为单例模式(singleton)rnpublic class JdbcUserDao implements UserDaornrn @Autowiredrn private DataSource ds;rn rn @PostConstructrn public void init()rn System.out.println("初始化方法");rn rn rn @PreDestroy //rn public void destroy()rn System.out.println("销毁方法");rn rn rn public void findByName() rn System.out.println("查询用户信息");rn rnrnrn[/code]rnrnrnException in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [C:\Users\lenovo\workspace\spring_day03\build\classes\org\mopon\demo1\JdbcUserDao.class]; nested exception is org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn't supported yet: file [C:\Users\lenovo\workspace\spring_day03\build\classes\org\mopon\demo1\JdbcUserDao.class]; nested exception is java.lang.IllegalArgumentExceptionrn at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:290)rn at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:242)rn at org.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:84)rn at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)rn at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1438)rn at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1428)rn at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:195)rn at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:139)rn at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:108)rn at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)rn at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)rn at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)rn at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)rn at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)rn at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)rn at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)rn at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:243)rn at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)rn at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)rn at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)rn at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:537)rn at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:451)rn at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)rn at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:83)rn at org.mopon.demo1.test.main(test.java:10)rnCaused by: org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn't supported yet: file [C:\Users\lenovo\workspace\spring_day03\build\classes\org\mopon\demo1\JdbcUserDao.class]; nested exception is java.lang.IllegalArgumentExceptionrn at org.springframework.core.type.classreading.SimpleMetadataReader.(SimpleMetadataReader.java:56)rn at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:80)rn at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:102)rn at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:266)rn ... 24 morernCaused by: java.lang.IllegalArgumentExceptionrn at org.springframework.asm.ClassReader.(Unknown Source)rn at org.springframework.asm.ClassReader.(Unknown Source)rn at org.springframework.asm.ClassReader.(Unknown Source)rn at org.springframework.core.type.classreading.SimpleMetadataReader.(SimpleMetadataReader.java:53)rn ... 27 morern
刚学会写函数,一用就报错了~
刚学PHP,写个函数用来绘制img标签,,但报错,求解~rnrnfunction draw_img($src,$class,$id,$other,$insert)rn$str=''.$insert.'';rnreturn $str;rnrnrnrnecho draw_img(MYIMAGESPATH.'icons/E-mail.png';)rnrnrn错误内容:rnParse error: syntax error, unexpected ';' in F:\PHP\www\htdocs\MyLife\Index.php on line 39
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springboot电商项目之易买网,完整的pom.xml配置,jsp页面,有购物车,三级分类和后台管理功能
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   项目介绍 面向学习型的开源框架,简洁高效,减少过渡封装,展现技术本质 Springboot作为基础框架,使用mybatis作为持久层框架 使用官方推荐的thymeleaf做为模板引擎,shiro作为安全框架,主流技术,“一网打尽” 极简配置,一键前后台代码生成    获取源码 Github地址:https://github.com/lcg0124/bootdo.git Oschi...
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