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Here we have defined bidder as a transient object and the EJB container will not serialize the bidder object when a bean instance gets passivated or when its state is replicated to another server. If after marking several fields as transient you observe data missing from your objects, it simply means that you went a little overboard and will need to undo some of the fields you marked as transient.

props.put( Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory" ); props.put( Context.PROVIDER_URL, "http://MyRemoteHost:7001" );

The following are some guidelines that you can use to optimize the performance of your MDB applications. We provided some MDB best practices in chapter 5 that you can use as a starting point. After implementing those techniques, you may want to revisit this section for some additional tips.

Most of the performance issues surrounding MDBs are generally related to the underlying JMS providers. Some general tips that we provided in chapter 4 include choosing the right messaging models and persistence strategy, using the correctly sized messages, setting the lifetime of messages, and using appropriate filters and handling of poison messages. Check your vendor documentation for the JMS provider you are using for your applications.

Most applications are comprised of two types of concerns: business and nonfunctional. Business concerns, also called functional requirements, correspond to the real-world behavior that you want to model. Nonfunctional concerns, or nonfunctional requirements, are additional services that the application must implement essentially, technical or system-level concerns. For example, in an application that manages human resources, the functionalities for adding

Consult your application server s documentation for the exact properties you need to provide. In addition, to make your beans more portable (and maintainable), you should read the property values in from an environment variable (or similar mechanism). Notice also that the example EJB uses the javax.rmi.PortableRemoteObject class to retrieve the EJB s stub for use. You must always use this class s narrow() method when retrieving a remote stub to ensure that the remote stub conforms to the IIOP protocol used now by Java RMI.

Initializing resources Like stateless session beans, MDB instances are pooled, and initialization tasks are performed only once, for any given MDB instance. You can perform expensive tasks such as initialization of resources (opening database connections, sockets, files, etc.) in any method annotated with @PostConstruct. Methods marked with @PostConstruct will be invoked only once, immediately after creation. Similarly, close any resources in methods annotated with @PreDestroy. This will significantly improve the performance of your classes in general, and your MDBs in particular. Sizing the pool

MDBs are pooled, and the pool size is usually configured using vendor-specific deployment descriptors. Improper sizing of MDB pools may degrade perfor-

mance of your applications when large numbers of messages arrive and there is not a sufficient number of bean instances available to process those messages. Make sure you do some predictive analysis in determining the capacity your system will need to support (including spikes, and growth over the short term). Then run some tests that will show how your hardware, operating system, and application server will perform to meet these expectations. There are almost as many ways to configure hardware and operating systems as there are combinations of the two. Once you are happy with that configuration, make sure your application server pool for MDBs is sized as well. This concludes the discussion on EJB performance. It s time to focus on scalability and high availability, which are two other important aspects of enterprise applications.

1.1 Invoking a local EJB from another EJB 1.12 Improving your client-side EJB lookup code 2.1 Generating home, remote, local, and local home interfaces 4.1 Retrieving an environment variable

and deleting an employee are business concerns, whereas application security and privileges are nonfunctional concerns. However, you need to be careful when using this distinction because a service can be nonfunctional in one application but functional in another. In most cases, the nonfunctional services are called throughout the code of the business layer. Nonfunctional services are therefore fundamentally crosscutting. Consequently, nonfunctional services are implemented as aspects in AOP, whereas business concerns are implemented as classes. In some cases, however, the business concerns are crosscutting making it appropriate to implement them as aspects.