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javaeclipsetomcatclassformaterror

java.lang.UnsupportedClassVersionError: yy/ii : Unsupported major.minor version 51.0

This is how error happened.Now i am using Eclipse Indigo integrated with apache tomcat 6.0 and also changed the default port to 9090.

Caused by: java.lang.UnsupportedClassVersionError: yy/ii : Unsupported major.minor version 51.0 (unable to load class yy.ii)
    at     org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1851)                                                                                             at     org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:108)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:58)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:297)
    at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1068)
    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.start(ContainerBase.java:1045)
    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)
    ... 6 more
Solution

  • Sounds like you're compiling with JDK7 but running Tomcat with JDK6. One way or another, you're trying to run class files in a JVM that's older than the compiler that compiled them. Make sure to run Tomcat with the same JVM as what you run Eclipse in.