Transaction types

In “Creating the MDB” on page 567 we specified the transaction as Bean.

Specifying Container would have these consequences:

  • The default container transaction type is Required. That means that a transaction is started for the onMessage method. The resources that are part of this transaction are the messages.

  • This transaction would also be used for the database access in the CMP beans, and the database is another resource.

  • The synchronization of multiple resources requires two-phase commit.

  • For the CMP we used a regular JDBC driver, not the XA-compliant driver that supports two-phase commit.

  • At the first database access, we get an error message that the resource cannot be added:

     TransactionIm E WTRN0063E: An illegal attempt to enlist ...

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