Beginning EJB 3, 2nd Edition: Java EE 7 Edition by Jonathan Wetherbee, Chirag Rathod, Raghu Kodali, Peter

By Jonathan Wetherbee, Chirag Rathod, Raghu Kodali, Peter Zadrozny

Boost robust, standards-based, back-end company common sense with starting EJB three, Java EE 7 version. Led via an writer group with twenty years of mixed firm JavaBeans event, you will how to use the hot EJB 3.2 APIs. you are going to achieve the data and abilities you will want to create the complicated company functions that run present day transactions and extra. particular at Java and Java EE builders, with and with no earlier EJB event, starting EJB three is filled with functional insights, approach tips, and code examples. As each one bankruptcy unfolds, you will not just discover a brand new quarter of the spec; you will additionally see how one can use it on your individual purposes via particular examples.

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Extra resources for Beginning EJB 3, 2nd Edition: Java EE 7 Edition

Sample text

When a session bean client invokes an asynchronous method, the container immediately returns the control to the client. This allows the client to perform tasks in parallel while the business method completes its execution on a separate thread. For example, clients can use this functionality to show the progress of a long running task using a progress bar. Asynchronous annotation. An @Asynchronous annotation at the class level marks all the business methods of the session bean as asynchronous. Future interface.

Increments are supported only by second, minute, and hour. Duplicate values within a list are ignored. Examples of Calendar-Based Time Expressions Let us see some examples that demonstrate the use of calendar-based time expressions. S. Pacific Time” • • @Schedule(dayOfWeek="Fri") “Every six hours on weekends” • • @Schedule(second="*", minute="*", hour="*") @Schedule(dayOfMonth="-1") “Every day only for year 2013” • @Schedule(year="2013") Timer Persistence Timers are persistent. A timer is persisted by the Timer Service by storing it in a database.

Following are the callbacks that map to the preceding events: • PostConstruct: Denoted with the @PostConstruct annotation. • PreDestroy: Denoted with the @PreDestroy annotation. • PreActivate: Denoted with the @PreActivate annotation. • PrePassivate: Denoted with the @PrePassivate annotation. The PostConstruct callback happens after a bean instance is instantiated in the EJB container. If the bean is using any dependency injection mechanism for acquiring references to resources or other objects in its environment, the PostConstruct event happens after injection is performed and before the first business method in the bean class is called.

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