Invocation statistics not collected on JMX based EJB2 managed components

This was brought to light while investigating JOPR-280.

During the Jopr AS5 plugin integration tests the metrics collection on EJB2 SFSBs, SLSBs, MDBs and Entity beans is tested.

For session beans a single remote method is called 10 times on a single bean. The test then checks for CreateCount == 1 and for appropriate method invocation statistics.
Both the create count and the invocation stats are always 0/empty. Note that this is also true for the MBeans of the session beans themselves when looking at the values in the jmx-console.

For MDBs the collection statistics fails "most of the time". This might be because the JNDI name of a bean contains @object-id. Once some messages are delivered to the bean the @object-id part of the JNDI name changes from time to time. I suspect that with that change, the stats go as well.

Entity bean metrics seem to be collected fine.