CWOBJ0073E

MISSING_CLASS_FOR_OPTIMISTIC_CALLBACK_CWOBJ0073E=CWOBJ0073E: WebSphere eXtreme Scale is unable to load the {0} class during deserialization. This class or a serializer for this class must be loadable by the eXtreme Scale runtime environment when you are using optimistic locking.

Explanation

When you are using optimistic locking, the default behavior is for the container server to check that the value was not updated. This check calls the equals method on the deserialized object. When you are using COPY_TO_BYTES copy mode, the class for the object might not exist on the container server.

User response

Use one of the following actions to resolve the error: (1) Package the specified class and any dependent classes so the container server can load the classes. (2) Package a serializer plug-in to deserialize data. (3) Use the built-in NoVersioningOptimisticCallback plug-in for this map. (4) Change the locking type to a type other than optimistic locking.