https://issues.apache.org/bugzilla/show_bug.cgi?id=44633

           Summary: say which jar/class is wrong when throwing
                    UnsupportedClassVersionError
           Product: Tomcat 6
           Version: 6.0.16
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


after happily using tomcat 6/java6, we had to move back to tomcat 5/java5. 

Unfortunately, it seems that one jar or .class files not yet compiled under
java5 got there too.

Suggestion:

in  at
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1815)

catch UnsupportedClassVersionError and re-throw it after adding hints with
which class sought/jar file it happens!

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:585)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
Caused by: java.lang.UnsupportedClassVersionError: Bad version number in .class
file
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1815)
        at
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:869)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1322)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1201)
        at
org.apache.catalina.core.StandardWrapper$1.run(StandardWrapper.java:1017)
        at java.security.AccessController.doPrivileged(Native Method)
        at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1013)
        at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932)
        at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3951)
        at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4225)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
        at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
        at
org.apache.catalina.core.StandardService.start(StandardService.java:450)
        at
org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
        ... 6 more


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