java.lang.NoClassDefFoundError: 2C

java 开发中遇到java.lang.NoClassDefFoundError: org/apache/avalon/framework/CascadingThrowable
错误信息,有时候会报,是什么原因导致的,如何解决,各路英雄好汉。下面附件错哦无信息图片和代码。谢谢

图片说明

package cn.com.pkufi.business.web.action.wechat;

import org.apache.avalon.framework.ExceptionUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import cn.com.jingpeng.business.util.authorize.AuthorizeUtil;
import cn.com.jingpeng.business.web.action.BaseAction;

public class Test1 extends BaseAction{

private String forwardUrl;
private String openId;
private String code;

private static final Logger logger = LoggerFactory.getLogger("wechat");



public String oauth2() {
    try {
        logger.info("[被动方式]授权用户获得的code : "+code+",req:"+request.getParameter("code"));
        String oauth2AccessToken = "" ;
        AuthorizeUtil.authorize(code);
        openId = AuthorizeUtil.openId;
        oauth2AccessToken = AuthorizeUtil.oauth2AccessToken ;
        session.put("Oauth2.AccessToken", oauth2AccessToken);
        logger.info("[被动方式]授权用户获得的openid : "+openId);
        session.put("wechat.openId", openId);
        logger.info("[被动方式]授权后跳转, forwardUrl: "+forwardUrl); 
        logger.info("=============授权成功==============="); 
    } catch (Exception e) {
        logger.error(ExceptionUtil.printStackTrace(e));
        e.printStackTrace();
        return ERROR;
    }
    return SUCCESS;
}



public String getOpenId() {
    return openId;
}

public void setOpenId(String openId) {
    this.openId = openId;
}

public String getForwardUrl() {
    return forwardUrl;
}

public void setForwardUrl(String forwardUrl) {
    this.forwardUrl = forwardUrl;
}

public String getCode() {
    return code;
}

public void setCode(String code) {
    this.code = code;
}

@Override
protected void processResultBusiness(boolean resultSuccess,
        String resultCode, String resultDescription) {
    // TODO Auto-generated method stub

}

}


[16-8-26 9:25:24:234 CST] 00000ad1 SystemOut O 2016-08-26 09:25:24,234 [WebContainer : 17] [org.hibernate.impl.SessionImpl] DEBUG org.hibernate.impl.SessionImpl -opened session at timestamp: 14721747242
[16-8-26 9:25:24:235 CST] 00000ad1 SystemOut O 2016-08-26 09:25:24,235 [WebContainer : 17] [cn.com.pkufi.business.web.action.wechat.AuthorityAction] INFO wechat -[被动方式]授权用户获得的code : null
[16-8-26 9:25:24:236 CST] 00000ad1 DefaultDispat E com.opensymphony.xwork2.util.logging.commons.CommonsLogger error Exception occurred during processing request: Method "oauth2" failed for object cn.com.pkufi.business.web.action.wechat.AuthorityAction@23fb8621
ognl.MethodFailedException: Method "oauth2" failed for object cn.com.pkufi.business.web.action.wechat.AuthorityAction@23fb8621 [java.lang.NoClassDefFoundError: org/apache/avalon/framework/CascadingThrowable]
at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1306)
at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)

6个回答

code没有赋值,没赋值就还是初始化的null,

写成code = request.getParameter("code");

这样试试吧。

java.lang.NoClassDefFoundError,看到这几字,我想到了:是不是jar包少了。

java.lang.NoClassDefFoundError一般有两种情况下会出现
一、所需要的类不在classpath中,或者类所在的jar不在classpath中
二、classLoader根据类加载规则,无法找到对应的类的字节码
第一种很好解决,只需要找到相关的类,并把它放到classpath中去,第二种一般情况比较复杂,需要按图索冀,查找到classLoader相关的信息来做分析

丢包了吧。检查一下吧

缺少对应的jar包,找不到这个类

检查是否最少对应的jar包,如果存在jar包找不到对应类,是需要clean

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SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/D:/apache-tomcat-7.0.40/webapps/house_my/WEB-INF/lib/slf4j-log4j12-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/D:/apache-tomcat-7.0.40/webapps/house_my/WEB-INF/lib/slf4j-nop-1.5.6.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. 2017-1-7 17:13:57 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [ActionServlet] in context with path [/house_my] threw exception [Servlet execution threw an exception] with root cause java.lang.NoClassDefFoundError: Could not initialize class com.bdqn.dao.HibernateUtil at com.bdqn.dao.impl.UserDaoImpl.select(UserDaoImpl.java:46) at com.bdqn.biz.impl.UserBizImpl.login(UserBizImpl.java:30) at com.bdqn.web.ActionServlet.doPost(ActionServlet.java:73) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)

mybatis与struts1 [java.lang.NoClassDefFoundError:org/apache/ibatis/io/Resources]

在Action中,当我要向数据库中插入一条记录时,报了下面的错误: [code="java"] javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/ibatis/io/Resources org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:294) org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187) com.zrxx.action.ProjectAction.execute(ProjectAction.java:33) org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) javax.servlet.http.HttpServlet.service(HttpServlet.java:637) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) java.lang.NoClassDefFoundError: org/apache/ibatis/io/Resources com.zrxx.util.SqlSessionFactoryTool.getSqlSessionFactory(SqlSessionFactoryTool.java:30) com.zrxx.dao.BaseDao.openSession(BaseDao.java:15) com.zrxx.dao.BaseDao.openSession(BaseDao.java:10) com.zrxx.dao.ProjectDao.insertPro(ProjectDao.java:13) com.zrxx.action.ProjectAction.add(ProjectAction.java:54) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270) org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187) com.zrxx.action.ProjectAction.execute(ProjectAction.java:33) org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) javax.servlet.http.HttpServlet.service(HttpServlet.java:637) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) [/code] 这个错误是当dao对象已经创建了,调用dao.insert()时发出的 附上我的SqlSessionFactoryTool源代码: [code="java"] public class SqlSessionFactoryTool { private static SqlSessionFactoryTool tool; private SqlSessionFactory factory; public static SqlSessionFactoryTool getInstance(){ if(tool == null) tool = new SqlSessionFactoryTool(); return tool; } public SqlSessionFactory getSqlSessionFactory(){ String resource = "/mybatis.xml"; Reader reader = null; try { reader = Resources.getResourceAsReader(resource); } catch (IOException e) { e.printStackTrace(); } factory = new SqlSessionFactoryBuilder().build(reader); return factory; } [/code] 这是我的目录结构 [img]http://dl.iteye.com/upload/attachment/597707/8f659481-6204-34e4-9c24-18ba93290695.png[/img]

SSM使用shiro注解报错:nested exception is java.lang.NoClassDefFoundError: org/aspectj/util/PartialOrder$PartialComparable

最近在学习shiro,在整合ssm使用shiro注解授权时一直报错: ``` org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'systemController' defined in file [E:\shiro\code\shiro9-springMVC\out\artifacts\shiro9_springMVC_war_exploded\WEB-INF\classes\com\shiro\controller\SystemController.class]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/util/PartialOrder$PartialComparable ``` web.xml部分代码: ``` <filter> <filter-name>shiroFilter</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> <init-param> <param-name>targetFilterLifecycle</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>shiroFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!--路径监听--> <listener> <listener-class>com.shiro.commons.ShiroContextListener</listener-class> </listener> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <!--配置文件的位置和名字--> <param-name>contextConfigLocation</param-name> <param-value>classpath*:springmvc.xml</param-value> </init-param> <!-- Servlet默认是请求到达服务器时创建对象 并初始化 load-on-startup:表示 服务器启动时创建对象并初始化 --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> ``` springmvc.xml部分代码: ``` <!--配置注解扫描--> <context:component-scan base-package="com.shiro" /> <!--shiro配置--> <import resource="classpath:shiro-config.xml" /> <!--使用shiro的权限注解 需要Shiro的 SpringAOP集成来扫描合适的注解类以及执行必要的安全逻辑--> <!--开启aop对类的代理--> <aop:config proxy-target-class="true" /> <!--开启shiro注解支持 配置shiro的注解适配器--> <bean class="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor"> <property name="securityManager" ref="securityManager" /> </bean> ``` shiro-config.xml配置: ``` <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd"> <!--加密方式配置--> <bean id="credentialsMatcher" class="org.apache.shiro.authc.credential.HashedCredentialsMatcher"> <property name="hashAlgorithmName" value="md5" /> <property name="hashIterations" value="2" /> </bean> <!--自定义realm--> <bean id="realm" class="com.shiro.commons.UserRealm"> <property name="credentialsMatcher" ref="credentialsMatcher" /> </bean> <!--配置缓存 ehcache--> <bean id="cacheManager" class="org.apache.shiro.cache.ehcache.EhCacheManager"> <!--可以配置ehcache--> <!--<property name="cacheManagerConfigFile" value=""></property>--> </bean> <!--将shiro安全管理器交给spring ioc容器管理--> <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager"> <!--设置realm--> <property name="realm" ref="realm" /> <!--设置缓存--> <property name="cacheManager" ref="cacheManager" /> </bean> <!--shiro web过滤器--> <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean"> <!--注入安全管理器--> <property name="securityManager" ref="securityManager" /> <!--未认证跳转的页面配置--> <property name="loginUrl" value="pages/login.jsp" /> <!--配置安全规则 --> <property name="filterChainDefinitions"> <value> <!--登录请求不做拦截--> /pages/login.jsp = anon /pages/guest.jsp = anon /toLogin = anon <!--静态资源不做拦截--> /static/** = anon <!--需要拦截的请求 user表示身份认证通过可以访问--> /** = user </value> </property> </bean> <!--使用工厂类将securityManager设置到环境中去 相当于 SecurityUtils.setSecurityManager--> <bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <!--调用静态方法--> <property name="staticMethod" value="org.apache.shiro.SecurityUtils.setSecurityManager"/> <!--需要的参数--> <property name="arguments" ref="securityManager" /> </bean> <!--shiro生命周期处理器--> <bean name="lifecycleBeanPostProcessor" class="org.apache.shiro.spring.LifecycleBeanPostProcessor"/> </beans> ``` 报错的controller注解代码 ``` /* * 使用shiro的权限注解 * 1、@RequiresPermissions 验证是拥有某权限,多个用‘,’隔开,参数2定义用and或者or连接条件 默认是and * */ //2、@RequiresAuthentication 通过认证的用户才可以访问 //3、@RequiresRoles(value = {"超级管理员","系统管理"},logical = Logical.OR) 验证是拥有某角色,多个用‘,’隔开,参数2定义用and或者or连接条件 默认是and //@RequiresGuest @RequiresPermissions(value = {"sys:add","sys:info"},logical = Logical.AND) @RequestMapping("System/updateRuleForm") public String updateRuleForm(HttpServletRequest request, Role role){ request.setAttribute("role",role); return "updateRole"; } ``` aop相关jar包 ``` <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.9</version> </dependency> <!-- https://mvnrepository.com/artifact/aopalliance/aopalliance --> <dependency> <groupId>aopalliance</groupId> <artifactId>aopalliance</artifactId> <version>1.0</version> </dependency> <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjrt --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.8.13</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>5.0.7.RELEASE</version> </dependency> <!-- https://mvnrepository.com/artifact/cglib/cglib-nodep --> <dependency> <groupId>cglib</groupId> <artifactId>cglib-nodep</artifactId> <version>2.2</version> </dependency> ``` 之前百度都说的缺少各种jar包,我现在把aop能用到的jar包都引入了,但还是报错 控制台报错代码: ``` 11-May-2020 15:14:13.134 信息 [RMI TCP Connection(4)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log No Spring WebApplicationInitializer types detected on classpath 11-May-2020 15:14:13.681 信息 [RMI TCP Connection(4)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log Initializing Spring FrameworkServlet 'springmvc' 11-May-2020 15:14:17.051 严重 [RMI TCP Connection(4)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log StandardWrapper.Throwable org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'systemController' defined in file [E:\shiro\code\shiro9-springMVC\out\artifacts\shiro9_springMVC_war_exploded\WEB-INF\classes\com\shiro\controller\SystemController.class]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/util/PartialOrder$PartialComparable at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:589) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:503) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:672) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:638) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:686) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:554) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:499) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:172) at javax.servlet.GenericServlet.init(GenericServlet.java:158) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1124) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1079) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:971) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4829) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5143) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:743) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:719) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:703) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1737) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:457) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:406) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357) at sun.rmi.transport.Transport$1.run(Transport.java:200) at sun.rmi.transport.Transport$1.run(Transport.java:197) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:196) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NoClassDefFoundError: org/aspectj/util/PartialOrder$PartialComparable at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2352) at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:833) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1278) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1138) at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.sortAdvisors(AspectJAwareAdvisorAutoProxyCreator.java:72) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:98) at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:76) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:352) at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:304) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:439) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1712) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:581) ... 63 more ``` 请大佬们看看是什么问题!!!

将一个简单的数据库查询部署到Tomcat时java.lang.NoClassDefFoundError: Could not initialize class

在完成一个数据库查询操作部署到Tomcat时报错java.lang.NoClassDefFoundError: Could not initialize class. 在没有使用服务器时,查询功能可以正常运行. 在启动服务器查询时报错 Servlet代码如下: ``` package com.lxl.web.servlet; import com.lxl.smis.dao.impl.IStudentDAO; import com.lxl.smis.dao.impl.StudentDAOImpl; import com.lxl.smis.domain.Student; 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 java.io.IOException; import java.util.List; @WebServlet("/student/list") public class ListStudentServlet extends HttpServlet { private IStudentDAO dao; public void init() throws ServletException { dao = new StudentDAOImpl(); } @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //1.接受请求参数,封装对象 //2.调用业务方法处理请求 System.out.println("hello"); List<Student> stus= dao.listAll(); for (Student stu : stus) { System.out.println(stu); } //3.控制界面跳转 } } ``` 错误提示: ![图片说明](https://img-ask.csdn.net/upload/201911/16/1573886138_700745.png) ```16-Nov-2019 15:29:27.029 严重 [http-nio-8080-exec-3] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [com.lxl.web.servlet.ListStudentServlet] in context with path [] threw exception [Servlet execution threw an exception] with root cause java.lang.NoClassDefFoundError: Could not initialize class com.lxl.smis.util.JDBCUtil at com.lxl.smis.util.JDBCTemplate.query(JDBCTemplate.java:73) at com.lxl.smis.dao.impl.StudentDAOImpl.listAll(StudentDAOImpl.java:41) at com.lxl.web.servlet.ListStudentServlet.service(ListStudentServlet.java:28) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) ``` 使用DeBug运行 感觉是这里出现问题,但并不知道到是什么意思 ![图片说明](https://img-ask.csdn.net/upload/201911/16/1573886445_32104.png) 查找网上解决方法 说这个报错的问题原因就是static变量的初始化失败导致 但我如果不用Servlet运行这个查找功能,直接在本地实现这个方法,是可以正常运行的. 请教一下各位大佬,是什么原因? 我是初学JAVA的小白,各位大佬见笑了.

Exception in thread "main" java.lang.NoClassDefFoundError:

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