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@Resource private MessageDrivenContext context;

transaction.commit(); }catch( Exception e ) { //need to rollback if( transaction == null ) transaction.rollback(); } //start next section of important code try { transaction = ejbContext.getUserTransaction(); transaction.begin(); //perform important code transaction.commit(); }catch( Exception e ) { //need to rollback if( transaction == null ) transaction.rollback(); } }

@Resource(name="jdbc/TurtleDS") injection public void setDataSource(DataSource dataSource) { this.dataSource = dataSource; } @PostConstruct public void initialize() { try { connection = dataSource.getConnection(); } catch (SQLException sqle) { sqle.printStackTrace(); } } @PreDestroy

abstract aspect, AspectJ, 50 Chain of Responsibility pattern, 165 167 Command pattern, 161 164 Observer pattern, 157 161 Proxy pattern, 168 170 acc (.acc) extension aspect-configuration files, JAC, 75 access modifiers, AspectJ wildcard for access modifiers, 31 ACCESSORS method-type operators, JAC, 70, 71 Account EJB implementation of business object pattern, 233 239 Account interface sample application, 213 AccountBean class, 234 AccountDetails class, 278 AccountPOJO class, 244 acs property, jac, 78 AddDateItf interface, Order class, 48 ADDERS method-type operators, JAC, 71 addItem method Customer Class, AspectJ, 24 Order Class, AspectJ, 25 TraceAspect class, JAC, 62, 67 Administration and Supervision functions, 191 204 introduction, 171 Java Management Extensions, 191 194 agent layer, 193 distributed services layer, 193 using JMX with AOP, 194 202 advice binding, JBoss AOP weaving pointcuts, 108 advice code, 17 19 AOP summary, 21 comparing AOP tools, 142 143 definition, 17 pointcuts and joinpoints, 28 types of, 17 advice code execution joinpoint type comparing AOP tools, 141 advice code, AspectJ, 43 47 after advice code, 44 after returning advice code, 45

public void cleanup() { try { connection.close(); connection = null; } catch (SQLException sqle) { sqle.printStackTrace(); } } public void onMessage(Message message) { Defines lifecycle callbacks try { ObjectMessage objectMessage = (ObjectMessage)message; ShippingRequest shippingRequest = (ShippingRequest)objectMessage.getObject(); processShippingRequest(shippingRequest); } catch (JMSException jmse) { jmse.printStackTrace(); context.setRollBackOnly();(); } catch (SQLException sqle) { sqle.printStackTrace(); context.setRollBackOnly(); } }

At times, you need a finer-grained control of transactions than the singletransaction-per-business method provided by container-managed transactions. If this is the case, it makes sense to change your session beans to bean-managed transactions. By managing transactions on your own, you can create as many as you need within a single method. This gives you the ability to specify small rollbacks, attempt to recover from errors, and provide specific explanation of exceptions. In a situation like this, you may even consider using nested transactions starting one transaction while executing within another. Unfortunately, this type of transactional programming is not allowed. Possibly in the future we will see the EJB specification modified to handle this behavior. For clarification, an EJB that declares its transactional behavior with RequiresNew called within another transaction is not an example of nested transactions. The containing transaction is suspended while the new one executes, and resumes when the new transaction completes. The inside transaction does not affect the first transaction. For EJBs, transactions are either suspended or propagated.

private void processShippingRequest(ShippingRequest request) throws SQLException { Statement statement = connection.createStatement(); statement.execute( "INSERT INTO " + "SHIPPING_REQUEST (" + "ITEM, " + "SHIPPING_ADDRESS, " + "SHIPPING_METHOD, " + "INSURANCE_AMOUNT ) " + "VALUES ( " + request.getItem() + ", " + "\'" + request.getShippingAddress() + "\', " + "\' " + request.getShippingMethod() + "\', " + request.getInsuranceAmount() + " )"); } }

The @MessageDriven annotation b identifies this object as an MDB and specifies the MDB configuration, including the fact that we are listening on the shipping request queue. Our code then marks this MDB as a JMS message listener C. The onMessage method implements the message listener interface F and processes incoming messages. A message-driven context is injected D and used inside the