EJB 3 in Action, 2nd Edition by Debu Panda, Reza Rahman, Ryan Cuprak, Michael Remijan

By Debu Panda, Reza Rahman, Ryan Cuprak, Michael Remijan

The EJB three framework presents a customary method to catch enterprise good judgment in plausible server-side modules, making it more uncomplicated to jot down, hold, and expand Java EE purposes. EJB 3.2 offers extra improvements and clever defaults and integrates extra absolutely with different Java applied sciences, reminiscent of CDI, to make improvement even more uncomplicated. EJB three in motion, moment version is a fast paced educational for Java EE enterprise part builders utilizing EJB 3.2, JPA, and CDI. It tackles EJB head-on via various code samples, real-life eventualities, and illustrations. past the fundamentals, this e-book comprises inner implementation info, top practices, layout styles, functionality tuning suggestions, and diverse technique of entry together with internet providers, relaxation prone, and WebSockets.

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Extra resources for EJB 3 in Action, 2nd Edition

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The same is true of JPA and CDI as well. Intelligent defaulting is especially important when you’re dealing with automated persistence using JPA. 4 Dependency injection versus JNDI lookup EJB 3 was reengineered from the ground up for dependency injection. This means that you can inject EJBs into other Java EE components and inject Java EE components into EJBs. This is especially true when using CDI with EJB 3. sayHello("Curious George"); } Isn’t that great? The @EJB annotation B transparently “injects” the HelloUserBean EJB into the annotated variable.

The first is JPA, which is the persistence standard for Java EE and CDI, and provides dependency injection and context management services to all Java EE components including EJB. 1 saw JPA 2 moved from an EJB 3 API to a completely separate Java EE specification. But JPA has some specific runtime integration points with EJB because the specifications are so closely related. We’ll say just a few things about JPA here because we have chapters dedicated to it. Persistence is the ability to have data contained in Java objects automatically stored into a relational database like Oracle database, SQL server database, and DB2 database.

5 CDI versus EJB injection EJB-style injection predates CDI. Naturally, this means that CDI injection adds a number of improvements over EJB injection. Most importantly, CDI can be used to inject almost anything. EJB injection, on the other hand, can only be used with objects stored in JNDI, such as EJB, as well as some container-managed objects like the EJB context. CDI is far more type-safe than EJB. Generally speaking, CDI is a superset of EJB injection. sayHello("Curious George"); } It might seem that CDI should be used for all Java EE injections, but it currently has a limitation.

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