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Employee emp = emfind(Employeeclass, empId); emremove(empgetParkingSpace()); When the transaction commits, we see the DELETE statement for the PARKING_SPACE table get generated, but then we get an exception containing a database error that shows that we have violated a foreign key constraint It turns out that a referential integrity constraint exists between the EMPLOYEE table and the PARKING_SPACE table The row was deleted from the PARKING_SPACE table, but the corresponding foreign key in the EMPLOYEE table was not set to NULL To correct the problem we have to explicitly set the parkingSpace attribute of the Employee entity to null before the transaction commits: Employee emp = emfind(Employeeclass, empId); ParkingSpace ps = empgetParkingSpace(); empsetParkingSpace(null); emremove(ps); Relationship maintenance is the responsibility of the application We will repeat this statement over the course of this book, but it cannot be emphasized enough.

A malicious user could pass a name to the application that contained a terminating quote and semicolon, followed by another SQL command (such as delete from products) that would let them do whatever they wanted. They would just need to end with another command that matched the SQL statement s ending quote. This is a very common attack, especially if the malicious user can guess details of your database structure.

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Almost every problem related to removing an entity always comes back to this issue If the entity to be removed is the target of foreign keys in other tables, those foreign keys must be cleared for the remove to succeed The remove operation will either fail as it did here or it will result in stale data being left in the foreign key columns referring to the removed entity in the event that there is no referential integrity An entity can be removed only if it is managed by a persistence context This means that a transaction-scoped entity manager can be used to remove an entity only if there is an active transaction Attempting to invoke remove() when there is no transaction will result in a TransactionRequiredException exception.

You can solve the blocking problem discussed earlier by allowing the actual report generation service request to be handled asynchronously. JMS message listeners can be applied to process this business request asynchronously. However, a more robust approach would be to use a message-driven bean (MDB). This is because MDBs combine the asynchronous behavior of the message listener with services provided by the EJB container. Spring provides support for building MDBs as well as sending messages to a JMS queue or topic. Just like stateless session beans, Spring also provides convenient base classes to develop MDBs, as shown in Figure 5-3. The root of the class hierarchy is the AbstractEnterpriseBean class, which can be used to load a Spring application context. The subclass AbstractMessageDrivenBean is the convenient class for developing MDBs. The setMessageDrivenContext is used to save the MessageDrivenContext object supplied by the EJB container. The subclasses can override the onEjbCreate method for the initializing or loading of any bean from the Spring application context associated with the MDB. The AbstractJmsMessageDrivenBean implements the MessageListener interface, thus making MDBs compatible with JMS messages.

Like the persist() operation we described earlier, application-managed and extended entity managers can remove an entity outside of a transaction, but the change will not take place in the database until a transaction involving the persistence context is committed After the transaction has committed, all entities that were removed in that transaction are left in the state that they were in before they were removed A removed entity instance can be persisted again with the persist() operation, but the same issues with generated state that we discussed in the Transaction Rollback and Entity State section apply here as well..

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