A OperationRuntimeDescription object contains immutable data that is needed during the runtime
(i.e. to cache marshal and demarshal information). The OperationRuntimeDescription object must
be immutable so that it can safely accessed by multiple theads without synchronization.
It cannot be used to store information that may not be available in different threads/
classloaders (i.e. it cannot have references to Class objects)
The actual OperationRuntimeDescription objects are accessed via the key.