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propagated from the client, if our method indicates that the transaction should be rolled back, the container will not only roll back the whole transaction but will also throw a javax.transaction.RollbackException back to the client. This lets the client know that the transaction it started has been rolled back by another method. Our placeSnagItOrder method is most likely invoked from a nontransactional web tier. Hence, the REQUIRED value in the @TransactionAttribute annotation will cause the container to create a brand-new transaction for us when the method is executed. If all the other session bean methods we invoke from our bean are also marked REQUIRED, when we invoke them they will join the transaction created for us. This is just fine, since we want the entire ordering action to be covered by a single umbrella transaction. In general, you should use the REQUIRED value if you are modifying any data in your EJB method and you aren t sure whether the client will start a transaction of its own before calling your method. REQUIRES_NEW The REQUIRES_NEW value indicates that the container must always create a new transaction to invoke the EJB method. If the client already has a transaction, it is temporarily suspended until our method returns. This means that the success or failure of our new transaction has no effect on the existing client transaction. From the client s perspective:

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publisher = new Client( "BookJMSFactory", "BookJMSTopic" ); System.out.println("Publishing message:"); if( args.length > 0){ filename = args[0]; publisher.sendToMDB(filename); publisher.close(); } } catch(Exception ex) { ex.printStackTrace(); } } }

Its transaction is paused. Our method is invoked. Our method either commits or rolls back its own transaction. The client s transaction is resumed as soon as our method returns.

SourceLocation Returns the localizaSourceLocation is a predefined interface that getSourceLocation() tion of the joinpoint in provides access to the file name, line number, the source code and class where the joinpoint is defined. Object getTarget() Object getThis() Returns the target object of the joinpoint Returns the source object of the joinpoint When the joinpoint deals with a method, getTarget returns the called object. When the joinpoint deals with a method call, getThis returns the calling object.

The REQUIRES_NEW attribute has limited uses in the real world. You should use it if you need a transaction but don t want a rollback to affect the client. Also use this value when you don t want the client s rollback to affect you. Logging is a great example. Even if the parent transaction rolls back, you want to be able to record the failure in your logs. On the other hand, failing to log a minor debugging message should not roll back your entire transaction and the problem should be localized to the logging component. SUPPORTS The SUPPORTS attribute essentially means the EJB method will inherit whatever the transactional environment of the caller is. If the caller does not have a transaction, the EJB method will be called without a transaction. On the other hand, if the

Listing 6.11 shows the sample message-driven bean that receives data from a streamed message. This bean simply prints out the data it receives.

caller is transactional, the EJB method will join the existing transaction and won t cause the exiting transaction to be suspended This approach avoids any needless overhead in suspending or resuming the client transaction The SUPPORTS attribute is typically useful for methods that perform read-only operations such as retrieving a record from a database table In our Snag-It example, the session bean method for checking whether a bid exists on the item about to be ordered can probably have a SUPPORTS attribute since it modifies no data MANDATORY MANDATORY really means requires existing that is, the caller must have a transaction before calling an EJB method and the container should never create a transaction on behalf of the client If the EJB method using the MANDATORY attribute is invoked from a nontransactional client, the container throws an EJBTransactionRequiredException This value is also very rarely used.

You should use this value if you want to make sure the client fails if you request a rollback We can make a reasonable case to require a MANDATORY transaction on a session bean method that charges the customer After all, we want to make sure nothing is accidentally given away for free if the client neglects to detect a failure in the method charging the customer, and the invoker s transaction can be forcibly rolled back by us when necessary NOT_SUPPORTED If we assign NOT_SUPPORTED as the transaction attribute, the EJB method cannot be invoked in a transactional context If a caller with an associated transaction invokes the method, the container will suspend the transaction, invoke the method, and then resume the transaction when the method returns This attribute is typically useful only for an MDB supporting a JMS provider in nontransactional, autoacknowledge mode.