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

Operating system limitations

You cannot share classes between 32-bit and 64-bit JVMs. Temporary disk space must be available to hold cache information. The operating system enforces cache permissions.

For operating systems that can run both 32-bit and 64-bit applications, class data sharing is not permitted between 32-bit and 64-bit JVMs. The listAllCaches suboption lists 32-bit or 64-bit caches, depending on the address mode of the JVM being used.

The shared class cache requires disk space to store identification information about the caches that exist on the system. This information is in the user profile directory. If the identification information directory is deleted, the JVM cannot identify the shared classes on the system and must re-create the cache.

The operating system enforces the permissions for accessing a shared class cache. If you do not specify a cache name, the user name is appended to the default name so that multiple users on the same system create their own caches by default.

Parent: Considerations and limitations of using class data sharing

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