顺便说一下我使用的是Myeclipse 8.5 tomcat5.5 jdk默认是sun jdk 1.6.0._13,我下载个 jdk 1.6.0_33 ！具体怎么解决，能解决我问题的分给双倍！
2012-6-25 18:56:44 org.apache.catalina.core.AprLifecycleListener init
信息: Loaded APR based Apache Tomcat Native library 1.1.22.
2012-6-25 18:56:44 org.apache.catalina.core.AprLifecycleListener init
信息: APR capabilities: IPv6 [false], sendfile [true], accept filters [false], random [true].
2012-6-25 18:56:45 org.apache.coyote.http11.Http11AprProtocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2012-6-25 18:56:45 org.apache.coyote.ajp.AjpAprProtocol init
信息: Initializing Coyote AJP/1.3 on ajp-8009
2012-6-25 18:56:45 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 813 ms
2012-6-25 18:56:45 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2012-6-25 18:56:45 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/5.5.35
2012-6-25 18:56:45 org.apache.catalina.core.StandardHost start
信息: XML validation disabled
2012-6-25 18:56:45 org.apache.catalina.startup.HostConfig deployWAR
信息: Deploying web application archive MyServlet.war
2012-6-25 18:56:45 org.apache.catalina.startup.HostConfig deployWAR
严重: Error deploying web application archive MyServlet.war
java.lang.UnsupportedClassVersionError: com/servlet/MyServlet : Unsupported major.minor version 51.0 (unable to load class com.servlet.MyServlet)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1964)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:933)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1405)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1284)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1068)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:966)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3996)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4266)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:884)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:737)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:498)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1203)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:448)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
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:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
2012-6-25 18:56:46 org.apache.catalina.core.ApplicationContext log
信息: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]