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On the other hand, if all the instances in the pool are busy, the new request will be serial-
ized since it's guaranteed that the same instance will not be allowed to serve multiple cli-
ents at the same time. Also, if a client sends out multiple messages to the server contain-
ing an MDB, there is no guarantee that the same MDB instance will be used for each mes-
sage or that the messages will be processed in the order in which the client sent them. This
means that the application should be designed to handle messages that arrive out of order.
The number of MDBs in the pool is configured in the EJB pool, which can be reached
from the console by navigating to Configuration | Container | EJB 3 | Bean Pools as de-
picted in the following screenshot:
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