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The most important factor that influences how you choose the classes is the way you want to organize in other words, group together the business data of the application Classes first and foremost provide a grouping mechanism for the data, with the associated processing included as the methods The OOP concepts of the class and the object allow you to write programs that feature more of the following than programs that use the procedural paradigm: Modularity: Because the processing that concerns an item or set of data is grouped together with the data in the same software entity (the class), a certain degree of modularity is achieved Reusability: As a result of modularity, only the extent to which a class is well designed, self-sufficient, and targeted at a precise goal determines its likelihood of being reusable in different software contexts.

from method body } ... @ApplicationException(rollback=true) public class CreditValidationException extends Exception { Specifies ... Application@ApplicationException(rollback=true) Exception public class CreditProcessingException extends Exception { ... @ApplicationException(rollback=false) Marks RuntimeException public class DatabaseException extends as ApplicationException RuntimeException { ...

beans (listings 6.12 and 6.13). The onMessage() method simply prints out a statement indicating it has received a message.

The first change from listing 6.1 you ll notice is the fact that the try-catch blocks have disappeared and have been replaced by a throws clause in the method declaration b. However, it s a good idea for you to gracefully handle the application exceptions in the client and generate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.

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.

public class MessageBean implements MessageDrivenBean, MessageListener { public void onMessage(Message msg) { MapMessage map = ( MapMessage ) msg; try { String symbol = map.getString("Symbol"); String description = map.getString("Description"); System.out.println("MDB 1 received Symbol : " + symbol + " " + description ); } catch(Exception ex) { ex.printStackTrace(); } } //other bean methods not shown }

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

Reliability: Because the data is encapsulated within objects, it can be manipulated only through the methods that define the object s interface (Directly manipulating the data is not possible) The valid ways to access the objects are therefore clearly identified, and programmers can safely use any of them Extendability: The concept of inheritance allows you to create new classes from those that already exist A new class can extend an existing class by adding data or processing, or it can specialize the existing elements For example, you could extend a class that manages data lists so that it manages only stacks (A stack is a list that requires specific rules for adding and removing elements) Because of these advantages, OOP has undeniably improved software engineering Developers have built more-complex programs in a simpler fashion than would have been possible through procedural programming.

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:

public class MessageBean2 implements MessageDrivenBean, MessageListener { public void onMessage(Message msg) { MapMessage map=(MapMessage)msg; try { String symbol = map.getString("Symbol"); String description = map.getString("Description"); System.out.println("MDB 2 received Symbol : " + symbol + " " + description ); } catch(Exception ex) { ex.printStackTrace(); } } }

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

void afterCompletion(boolean committed) Called after the transaction finishes. The boolean committed flag indicates whether a method was committed or rolled back.