SSH整合后tomcat启动报错SEVERE: Exception starting filter struts2 java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor

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