Hi,
Welcome to JavaRanch!
I've read about this error message being caused by a bug in the compiler used to compile the class reported in the error message (here, oracle/apps/fem/mappingwizard/validation/server/ValidationEngineAMImpl). Both the "fastjava" compiler that comes with Netbeans and the Eclipse
IDE compiler have reportedly created class files with bad line number tables in some circumstances. For the Eclipse compiler, it was new-style "for" loops with generics that could trigger the bug.
Anyway, since this is happening in an Oracle-provided class, there's not much you can do about it other than upgrade to the newest patchlevel of OAS that you can and hope they've fixed it.