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Posted to users@tomcat.apache.org by Steve R Burrus <bu...@swbell.net> on 2006/08/31 01:12:00 UTC

Need Help w. A UnsupportedClassVersionError.

  I was trying to see a simple servlet when I got the following server
  error! What does that mean, a "UnsupportedClassVersionError" and how
  do I go about fixing this problem in hopefully the quickest way possible??


   


  HTTP Status 500 -

------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented 
it from fulfilling this request.

exception

javax.servlet.ServletException: Error allocating a servlet instance
	com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
	com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
	org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
	com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
	com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
	com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
	com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
	com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
	com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
	com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)

root cause

java.lang.UnsupportedClassVersionError: Bad version number in .class file
	java.lang.ClassLoader.defineClass1(Native Method)
	java.lang.ClassLoader.defineClass(ClassLoader.java:620)
	java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
	org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1955)
	org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:945)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1411)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1275)
	com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
	com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
	org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
	com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
	com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
	com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
	com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
	com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
	com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
	com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)

Re: Need Help w. A UnsupportedClassVersionError.

Posted by Mark Thomas <ma...@apache.org>.
Steve R Burrs wrote:
> 
>  I was trying to see a simple servlet when I got the following server
>  error! What does that mean, a "UnsupportedClassVersionError" and how
>  do I go about fixing this problem in hopefully the quickest way possible??

Usually something along the lines of running a class compiled with
Java5 without the 1.4 compatibility option turned on on a 1.4 JVM or
something similar.

Recompilation is usually the quickest fix.

Mark

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