严重: Null component Catalina:type=JspMonitor,name=jsp,WebModule=//localhost/ztb_plat,J2EEApplication=none,J2EEServer=none
java.lang.reflect.InvocationTargetException
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.UnsupportedClassVersionError: services/xss/XssFilter : Unsupported major.minor version 51.0 (unable to load class services.xss.XssFilter)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2858)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1159)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1647)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.catalina.startup.WebAnnotationSet.loadClassAnnotation(WebAnnotationSet.java:145)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationFilterAnnotations(WebAnnotationSet.java:84)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:57)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:294)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1047)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:265)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4646)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:822)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:759)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
... 6 more
当切换jdk后服务器启动时经常会出现这个问题。
如果在win7下开发项目是使用的jdk版本和项目运行服务器jdk版本不同就会出现上面的问题。
解决方法：因为很多linux系统还不支持jdk1.7，所以要尽量避免使用jdk1.7开发程序，我将win7下的jdk重装为jdk1.6，然后将项目的java compiler改为jdk1.6，对项目进行重新编译问题就解决了。
修改项目java compiler的方法：在项目点右键->选择Perperties->在出现的菜单中选择Java Compiler->最上面选中Enable project Specific setting->然后将jdk改为jdk1.6->完成。