The EJB container controls the lifecycle of a Message-driven bean. The Message-driven bean instance lifecycle has three states, as shown in Figure 10.1:
Does Not Exist— The Message-driven bean has not been instantiated yet or is awaiting garbage collection.
Method Ready Pool— A pool of Message-driven bean instances, similar to the instance pool used for stateless session beans.
Processing a message— The Message-driven bean has been instantiated and is handling a message.
After constructing the new instance of the Message-driven bean object, the container invokes ...