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The first change from listing 6.1 you ll notice is the fact that the try-catch blocks have disappeared and have been replaced by a throws clause in the method declaration b. However, it s a good idea for you to gracefully handle the application exceptions in the client and generate appropriate error messages. The various nested method invocations still throw the three exceptions listed in the throws clause C. The most important thing to note, however, is the three @ApplicationException specifications on the custom exceptions. The @ApplicationException annotation D identifies a Java checked or unchecked exception as an application exception.
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In EJB, an application exception is an exception that the client is expected to handle. When thrown, such exceptions are passed directly to the method invoker. By default, all checked exceptions except for java.rmi.RemoteException are assumed to be application exceptions. On the other hand, all exceptions that inherit from either java.rmi. RemoteExceptions or java.lang.RuntimeException are assumed to be system exceptions (as you might already know, all exceptions that inherit from java.lang.RuntimeException are unchecked). In EJB, it is not assumed that system exceptions are expected by the client. When encountered, such exceptions are not passed to the client as is but are wrapped in a javax.ejb.EJBException instead.
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In listing 6.2, the @ApplicationException annotations on CreditValidationException and CreditProcessingException do not change this default behavior since both would have been assumed to be application exceptions anyway. However, by default, DatabaseException E would have been assumed to be a system
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Container-managed transactions
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Session synchronization
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Although using CMT doesn t give you full control over when a transaction is started, committed, or rolled back, you can be notified about the transaction s lifecycle events. This is done simply by having your CMT bean implement the javax. ejb.SessionSynchronization interface. This interface defines three methods:
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void afterBegin() Called right after the container creates a new transaction and before the business method is invoked. void beforeCompletion() Invoked after a business method returns but
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right before the container ends a transaction.
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void afterCompletion(boolean committed) Called after the transaction finishes. The boolean committed flag indicates whether a method was committed or rolled back.
Implementing this interface in a stateful session bean can be considered close to having a poor man s persistence mechanism, because data can be loaded into the bean when the transaction starts and unloaded right before the transaction finishes, while the afterCompletion callback can be used to reset default values. However, you can make a valid argument that since session beans are supposed to model processes, if it makes sense to cache some data and synchronize with the database as a natural part of a process, then this practice is just fine, if not fairly elegant. Note this facility doesn t make much sense in a stateless session bean or MDB where data should not be cached anyway; therefore, the interface is not supported for those bean types.
exception. Applying the @ApplicationException annotation to it causes it to be treated as an application exception instead. More than the @ApplicationException annotation itself, the rollback element changes default behavior in profound ways. By default, application exceptions do not cause an automatic CMT rollback since the rollback element is defaulted to false. However, setting the element to true tells the container that it should roll back the transaction before the exception is passed on to the client. In listing 6.2, this means that whenever a CreditValidationException, CreditProcessingException, or DatabaseException is thrown, the transaction will be rolled back and the client will receive an exception indicating the cause for failure, accomplishing exactly the same thing as the more verbose code in listing 6.1 aims to do. If the container detects a system exception, such as an
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