IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Shared classes diagnostic data > Debugging problems with shared classes

Dealing with verification problems

Verification problems (typically seen as java.lang.VerifyErrors) are potentially caused by the cache returning incorrect class bytes.

This problem should not occur under typical usage, but there are two situations in which it could happen:

• The class loader is using a SharedClassTokenHelper and the classes in the cache are out-of-date (dynamic updates are not supported with a SharedClassTokenHelper).
• Runtime bytecode modification is being used that is either not fully predictable in the modifications it does, or it is sharing a cache with another JVM that is doing different (or no) modifications. When you have determined the cause of the problem, destroy the cache, correct the cause of the problem, and try again.

Parent: Debugging problems with shared classes

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