By Debu Panda, Reza Rahman, Ryan Cuprak, Michael Remijan
The EJB three framework offers a typical approach to seize enterprise common sense in doable server-side modules, making it more straightforward to write down, hold, and expand Java EE functions. EJB 3.2 offers extra improvements and clever defaults and integrates extra absolutely with different Java applied sciences, equivalent to CDI, to make improvement even more uncomplicated. EJB three in motion, moment variation is a fast paced instructional for Java EE enterprise part builders utilizing EJB 3.2, JPA, and CDI. It tackles EJB head-on via a variety of code samples, real-life eventualities, and illustrations. past the fundamentals, this e-book contains inner implementation information, most sensible practices, layout styles, functionality tuning assistance, and diverse technique of entry together with internet prone, relaxation providers, and WebSockets.
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Extra resources for EJB 3 in Action, 2nd Edition
In the brave new world of EJB 3, a component is what it ought to be—nothing more than a POJO with some special powers. More importantly, these powers stay invisible until they’re needed and don’t distract from the real purpose of the component. You’ll see this firsthand throughout this book, especially starting in chapter 2. To use EJB services, your component must be declared to be a recognized EJB component type. EJB recognizes two specific types of components: session beans and message-driven beans.
ENTITYMANAGER Entities tell a JPA provider how they map to the database, but they don’t persist themselves. The EntityManager interface reads the ORM metadata for an entity and performs persistence operations. The EntityManager knows how to add entities to the database, update stored entities, and delete and retrieve entities from the database. JAVA PERSISTENCE QUERY LANGUAGE JPA provides a specialized SQL-like query language called Java Persistence Query Language (JPQL) to search for entities saved into the database.
Singleton session beans maintain the state, are shared by all clients, and live for the duration of the application. You could use a singleton bean for a discount processing component since the business rules for applying discounts are usually fixed and shared across all clients. 1. A session bean can be invoked either locally or remotely using Java RMI. A stateless or singleton session bean can also be exposed as a SOAP or REST web service. 2 Message-driven beans Like session beans, message-driven beans (MDBs) process business logic.