错误信息： 

 SEVERE: Exception starting filter struts2

 java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor

     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:260)

     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:473)

     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:4775)

     at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5452)

     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)

 Caused by: java.lang.ClassNotFoundException: org.objectweb.asm.ClassVisitor

     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)

     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)

     ... 22 more

经百度后得知，需要添加一下jar包。

  • asm-commons-3.3.jar
  • asm-3.3.jar
  • asm-tree-3.3.jar

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