eclipse ClassNotFoundException 即使包含类的 jar 正确存在于类路径中
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ClassNotFoundException even though the jar containing the class is properly present in the classpath
提问by blaiso
I'm configuring a new project in eclipse. my project has many modules including one of them named eas.core.
to the buildPath of my eas.core module, i have added a jar file common.jcr.jar containing a class named ContentRepositorySettings, that I'm using into my codes. but on runtime, I'm still getting a ClassNotFoundExceptionas shown below
我正在 eclipse 中配置一个新项目。我的项目有许多模块，其中之一名为 eas.core。在 eas.core 模块的 buildPath 中，我添加了一个 jar 文件 common.jcr.jar，其中包含一个名为 的类ContentRepositorySettings，我在代码中使用了该类。但在运行时，我仍然得到ClassNotFoundException如下所示的
java.lang.NoClassDefFoundError: cm/bao/common/jcr/ContentRepositorySettings
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2944)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1208)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1688)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
at cm.bao.eas.core.ElectronicArchivingApplicationImpl.setupGlobalSettings(ElectronicArchivingApplicationImpl.java:33)
at cm.bao.eas.core.ElectronicArchivingApplicationImpl.start(ElectronicArchivingApplicationImpl.java:49)
at cm.bao.eas.ui.gwt.server.listner.ElectronicArchivingContextListner.contextInitialized(ElectronicArchivingContextListner.java:18)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
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:745)
Caused by: java.lang.ClassNotFoundException: cm.bao.common.jcr.ContentRepositorySettings
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1718)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
回答by James Jithin
If your project is Faceted, right click on the project and go to Properties, and choose Deployment Assemblyon the left pane. Check if the dependencies exists there as Build Pathentries or Archives(jars). Once this is done you may do Project>Cleanand restart the server.
如果您的项目是Faceted，请右键单击该项目并转到Properties，然后Deployment Assembly在左侧窗格中选择。检查依赖Build Path项是否以条目或Archives(jars) 的形式存在。完成此操作后，您可以执行Project>Clean并重新启动服务器。
