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J2EE™ Tutorial, The by Beth Stearns, Monica Pawlan, Eric Jendrock, Kim Haase, Dale Green, Stephanie Bodoff

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Handling Exceptions

The exceptions thrown by enterprise beans fall into two categories: system and application.

A system exception indicates a problem with the services that support an application. Examples of these problems include the following: a database connection cannot be obtained, a SQL insert fails because the database is full, or a lookup method cannot find the desired object. If your enterprise bean encounters a system-level problem, it should throw a javax.ejb.EJBException. The container will wrap the EJBException in a RemoteException, which it passes back to the client. Because the EJBException is a subclass of the RuntimeException, you do not have to specify it in the throws clause of the method declaration. If a system exception ...

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