IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Shared classes diagnostic data > Dealing with runtime bytecode modification

JVMTI redefinition and retransformation of classes

Redefined classes are never stored in the cache. Retransformed classes are not stored in the cache by default, but caching can be enabled using the -Xshareclasses:cacheRetransformed option.

Redefined classes are classes containing replacement bytecode provided by a JVMTI agent at run time, typically where classes are modified during a debugging session. Redefined classes are never stored in the cache.

Retransformed classes are classes with registered retransformation capable agents that have been called by a JVMTI agent at run time. Unlike RedefineClasses, the RetransformClasses function allows the class definition to be changed without reference to the original bytecode. An example of retransformation is a profiling agent that adds or removes profiling calls with each retransformation. Retransformed classes are not stored in the cache by default, but caching can be enabled using the -Xshareclasses:cacheRetransformed option. This option will also work with modification contexts or partitions.

Parent: Dealing with runtime bytecode modification

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