MANDATORY

The container must invoke an enterprise bean method whose transaction attribute is set to MANDATORY in a client's transaction context. The client is REQUIRED to call with a transaction context.

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If the client calls with a transaction context, the container performs the same steps as described in the REQUIRED case.
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If the client calls without a transaction context, the container throws the javax.ejb.EJBTransactionRequiredException. If the EJB 2.1 client view is used, the container throws the javax.transaction.TransactionRequiredException exception if the client is a remote client, or the javax.ejb.TransactionRequiredLocalException if the client is a local client.