Internal server error with weblogic

[vinnu kumar]

Hi,need help in solving this..
I executed an application in tomcat,but when it comes to weblogic it is showing internal server error.the same application is executed in tomcat.
The error what i'm getting when i run it in browser is.

Error 500--Internal Server Error

java.lang.NoClassDefFoundError: java/lang/StringBuilder
at Regsrv.service(Regsrv.java:10)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:971)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:402)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6350)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3635)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2585)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)

[suravarapu sridhar]

Check the version of JVM you have used to compile your application, did you compile with the same version as what weblogic server is running on ?