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

SharedClassHelper partitions

Modification contexts cause all classes loaded by a particular JVM to be stored in a separate cache area. If you need a more granular approach, the SharedClassHelper API can store individual classes under "partitions".

This ability to use partitions allows an application class loader to have complete control over the versioning of different classes and is particularly useful for storing bytecode woven by Aspects. A partition is a string key used to identify a set of classes. For example, a system might weave a number of classes using a particular Aspect path and another system might weave those classes using a different Aspect path. If a unique partition name is computed for the different Aspect paths, the classes can be stored and retrieved under those partition names.

The default application class loader or bootstrap class loader does not support the use of partitions; instead, a SharedClassHelper must be used with a custom class loader.

Parent: Dealing with runtime bytecode modification

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