Following operations within singleton EJB should be allowed in POST_CONSTRUCT and PRE_DESTROY callbacks according to EJB 3.1 spec --> section.4.8.6 --> Table 3.

Following operations within singleton EJB should be allowed in POST_CONSTRUCT and PRE_DESTROY callbacks according to EJB 3.1 spec --> section.4.8.6 --> Table 3.

case timerMethod:
case setRollbackOnly:
case getRollbackOnly:
case UserTransactionMethod:

Seems current SingletonContext was copied from StatelessContext so that they looks similar. But for the operations above, singleton EJB has different definition to that of stateless EJB according the the spec.