Unable to load impl class error after WAR file rebuilt

Hi
I have the source code for a working WAR file. I wanted to make a small change to the code and rebuilt the WAR. Now the previous WAR version works but even when I rebuild the WAR from the unedited code I get the error "unable to load impl class"
and ClassNotFoundException: Class bytes found but defineClass() failed for ...
Does anyone know what kind of changes in my environment would cause this problem?
Thanks
J Armstrong

This was caused by using jdk1.6.0_02 to compile the java files where jdk1.50_06 was required

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