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<bean id = "itemService" class = "actionbazaar.buslogic.ItemServiceBean"> <property name = "itemManager" ref = "itemManager"/> </bean>
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References EJB
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In listing 16.5 we define a bean instance that injects an EJB instance by looking it up in the JNDI b when referenced by another bean instance c. If you are a big fan of the new Spring 2.0 configuration, then you ll be tempted to use the following instead of JndiObjectFactoryBean. Go ahead; indulge your temptation.
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<jee:jndi-lookup id = "itemManager" jndi-name = "ejb/ItemManager" resource-ref = "true"/>
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Unlike in EJB 2, there is no difference between invoking remote or local EJBs in EJB 3, and the configuration will be identical for both local and remote session beans. We encourage you to explore the latest Spring 2.0 documentation at www.springframework.org/documentation to learn about the latest support of EJB 3 features in the Spring framework.
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16.4 Summary
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This chapter explained that even though EJB 3 is a specification and Spring is a framework, you can use them together successfully to build flexible, powerful applications. You can use parts of the EJB 3 implementation, or all of it, within your Spring applications. Spring can simplify the use of both EJB 3 and JPA, but at the price of foraging through Spring s XML configuration files. You learned how to develop a Spring-enabled EJB (session bean or MDB) and leverage the power of Spring within your EJB components. Similarly, you can access an EJB 3 session bean from your Spring bean and reuse your business logic. EJB 3 is a great framework for building enterprise Java applications, and it significantly improves developer productivity. It has some minor limitations, such as
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support for POJO injection, and we hope that these limitations will be addressed in the next version of the specification. Throughout this book we provided many best practices and tuning tips, and we trust you can use this information to effectively build your next application.
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RMI and JNDI
APPENDIX A
RMI and JNDI
Java Remote Method Invocation (RMI) and the Java Naming and Directory Interface (JNDI) are two central Java technologies that EJB 3 uses extensively under the hood. RMI is the technology that enables transparent Java native remote communication between EJB clients and beans. JNDI, on the other hand, enables a whole host of EJB functionality by acting as the central service registry for a Java EE container. One of the major enhancements in EJB 3, dependency injection (DI), is simply a wrapper over JNDI lookups. In this appendix we offer a brief primer on both of these technologies, especially as they relate to EJB 3.
A.1 Distributed communication with RMI
Java RMI made its debut very early in Java s history. (also known Java Remote Method Protocol (JRMP)). It became clear that, as a platform that touts the distributed computing mantra The network is the computer, Java must provide a simple and robust mechanism for communication across JVM instances. Ideally, method calls on an object running in one JVM should be executed transparently in another remote JVM. With the help of a small amount of boilerplate setup code combined with a few code-generation tools, RMI delivers on this promise. To invoke an object method remotely using RMI, you must
Register the remote object implementing the method with an RMI registry. Look up the remote object reference from the registry (the remote reference is accessed through an interface). Invoke the remote method through the reference obtained from the registry.
The idea of a registry to store remote object references is central to RMI. All objects that need to be invoked remotely must be registered with an RMI registry. In order to be registered with an RMI server and be invoked remotely, an object must extend a few RMI classes as well as implement a remote interface. A remote interface defines the object methods that can be invoked remotely. Like the target remote object itself, a remote interface must extend a few RMI interfaces. Once a remote object is registered with a registry, any client that can access the registry can obtain a reference to it. To get a reference to a remote object, the client must retrieve it from the registry by name and then invoke it through the remote interface. Each time a client invokes a method through the remote interface, the method invocation request is carried transparently across the wire to the remote object. The remote object method is then executed inside its own JVM.
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