严重: Null component Catalina:type=JspMonitor,name=jsp,..J2EEApplication=none,J2EE

2010-1-7 10:20:53 org.apache.catalina.core.AprLifecycleListener init
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: D:\J2EE\MyEclipse Blue 7.0 M2\bin;D:\J2EE\Apache Software Foundation\Tomcat 6.0\bin
2010-1-7 10:20:53 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2010-1-7 10:20:53 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 882 ms
2010-1-7 10:20:53 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2010-1-7 10:20:53 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.16
2010-1-7 10:20:55 org.apache.tomcat.util.modeler.Registry registerComponent
严重: Null component Catalina:type=JspMonitor,name=jsp,WebModule=//localhost/nxyc,J2EEApplication=none,J2EEServer=none
2010-1-7 10:20:55 org.apache.catalina.startup.HostConfig deployDirectory
严重: Error deploying web application directory nxyc
java.lang.UnsupportedClassVersionError: Bad version number in .class file
 at java.lang.ClassLoader.defineClass1(Native Method)
 at java.lang.ClassLoader.defineClass(Unknown Source)
 at java.security.SecureClassLoader.defineClass(Unknown Source)
 at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1819)
 at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)
 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1327)
 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)
 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:297)
 at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1064)
 at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261)
 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4252)
 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
 at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:924)
 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:887)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
 at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1147)
 at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
 at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
 at org.apache.catalina.core.StandardService.start(StandardService.java:516)
 at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2010-1-7 10:20:56 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2010-1-7 10:20:56 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2010-1-7 10:20:56 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/47  config=null
2010-1-7 10:20:56 org.apache.catalina.startup.Catalina start
信息: Server startup in 2427 ms

解决办法:
1.打开MyEclipse
2.Window
3.Preferences
4.选择Java节点
5.Installed JREs
6.可以看到当前使用的JVM是什么版本，路径在哪里，现在我们要改正和Tomcat一样的虚拟机.
6.Edit
7.JRE home directory
8.Browse 找到:C:\Sun\SDK\jdk\jre(找到你的安装目录)
9.ok
搞定了.!

分析:
比如，你項目中的是JRE5.0但compile是JRE6.0則出現上述錯誤。或者版本不一致!

如果工程原来是jre1.5编译的，换到一个新的MyEclipse版本需要维持用1.5,不能是1.6等，修改办法：
window-->preferences-->Java-->Compiler-->Compiler compience level将1.6改成1.5

 

本人出现的问题属于编译器版本的更改，以前工程在MyEclipse6.0里面，用的是1.5，现在导入到MyEclipse7.0/8.0 M中，编译器默认是1.6故出现无法运行的情况，按照上面红色的步骤修改，重新编译部署运行success.