java - 嵌套异常错误java.lang.NoClassDefFoundError

Question

我使用 Eclipse 进行 Java 编程，出现以下错误:

GRAVE: Exception lors de l'envoi de l'évènement contexte initialisé (context initialized) à l'instance de classe d'écoute (listener) org.springframework.web.context.ContextLoaderListenerorg.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [com.sis.artemis.dashboard.statistics.sdis.personnels.service.SdisPersonnelsStatisticsServiceImpl] for bean with name 'sdisPersonnelsStatisticsService' defined in class path resource [resources/sdis-services.xml]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: com/sis/artemis/dashboard/statistics/sdis/personnels/service/SdisPersonnelsStatisticsService    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1238)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:576)    at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1304)    at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:870)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:556)    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)    at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)    at org.apache.catalina.core.StandardService.start(StandardService.java:519)    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)    at org.apache.catalina.startup.Catalina.start(Catalina.java:581)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)    at java.lang.reflect.Method.invoke(Method.java:597)    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)Caused by: java.lang.NoClassDefFoundError: com/sis/artemis/dashboard/statistics/sdis/personnels/service/SdisPersonnelsStatisticsService    at java.lang.ClassLoader.defineClass1(Native Method)    at java.lang.ClassLoader.defineClass(ClassLoader.java:620)    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2722)    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1124)    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1612)    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)    at org.springframework.util.ClassUtils.forName(ClassUtils.java:257)    at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:408)    at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1256)    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1227)    ... 24 more20 juil. 2011 11:32:36 org.apache.catalina.core.StandardContext startGRAVE: Error listenerStart20 juil. 2011 11:32:36 org.apache.catalina.core.StandardContext startGRAVE: Erreur de démarrage du contexte [/artemis-dashboard-spring] suite aux erreurs précédentes

但是类定义良好，今天早上我没有这个问题，并且我没有更改任何内容。

有人有办法解决我的问题吗？

Answer 1

对于此错误，首先要认识到它是一个运行时问题，通常是类路径问题。确保它所提示的类位于您的类路径中。如果相关类位于另一个 jar 中，请确保该 jar 位于您的类路径中。如果该类位于项目中的其他位置，请确保如果您从 eclipse 运行该类，则该类位于源文件夹或类似文件夹中。

此错误意味着该类在编译时存在，但现在运行代码的 JVM 无法再找到有问题的类。