Entity Bean and Exception

The exception thrown by entity beans are divided into two categories. The first is a system exception, such as SQLException, which alerts the container that there is problem with services that suport an application, therefore requiring the services of a system administrator to fix the problem. The other type of exception is an application exception, which alerts the container to an error in the business processes of a bean. Application exceptions are further divided into customized and predefined exceptions. A customized exception is an exception you have created specifically for your application.

A predefined exception is alreay part of a Java package and is provided to deal with common problems that arise within EJBs, for example, the CreateException.