获取异常: com/opensymphony/xwork2/util/finder/ClassFinder$InfoBuildingVisitor java.lang.NoClassDefFoundError

Question

我在我的struts项目中得到了下面的异常。我已经在CLASSPATH中包含了xwork-core-2.3.8.jar。当我部署我的应用程序时，我得到了这个错误，但是当我运行我的应用程序时，我的操作类com.logging.actions.OperationalSupportAction工作得很好，并且我能够在我的屏幕(jsp页面)上显示结果。

com.opensymphony.xwork2.util.logging.commons.CommonsLogger error
SEVERE: Unable to read class [com.logging.actions.OperationalSupportAction]
java.lang.NoClassDefFoundError: com/opensymphony/xwork2/util/finder/ClassFinder$InfoBuildingVisitor
    at com.opensymphony.xwork2.util.finder.ClassFinder.readClassDef(ClassFinder.java:717)
    at com.opensymphony.xwork2.util.finder.ClassFinder.<init>(ClassFinder.java:112)
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:390)
    at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:347)
    at org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:249)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:429)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:471)
    at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4656)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5309)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Answer 1

在struts配置中，如struts.xml，您已经编写了

<action class="com.logging.actions.OperationalSupportAction"

但是类路径上没有这样的操作，因此类阅读器无法获得该类的定义。