IBM User Guide for Java V7 on Windows > Performance > Class data sharing between JVMs > Considerations and limitations of using class data sharing

JVMTI RetransformClasses() is unsupported

You cannot run RetransformClasses() on classes loaded from the shared class cache.

The JVM might throw the exception UnmodifiableClassException if you attempt to run RetransformClasses(). It does not work because class file bytes are not available for classes loaded from the shared class cache. If you must use RetransformClasses(), ensure that the classes to be transformed are not loaded from the shared class cache, or disable the shared class cache feature.

Parent: Considerations and limitations of using class data sharing

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