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 by means of an writer crew with twenty years of mixed firm JavaBeans adventure, you are going to tips on how to use the recent EJB 3.2 APIs. you will achieve the information and abilities you will have to create the advanced firm purposes that run brand new transactions and extra. distinct at Java and Java EE builders, with and with no past EJB event, starting EJB three is full of functional insights, technique counsel, and code examples. As each one bankruptcy unfolds, you will not just discover a brand new quarter of the spec; you are going to additionally see how one can use it on your individual purposes via particular examples.
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Extra info for Beginning EJB 3, 2nd Edition: Java EE 7 Edition
Checking the status of the asynchronous method using the isDone() method • Cancelling the method invocation using cancel(boolean) method. Calling cancel() does not interrupt the thread, it simply sets a state flag that can be checked within the running method so that it may gracefully interrupt its execution and return. • Checking if the method invocation was cancelled using isCancelled() method • Checking for exceptions ■■Note Session bean methods that are exposed as web services can’t be asynchronous.
The following sections will walk you through the steps necessary to compile, deploy, and test these session beans. Prerequisites Before performing any of the steps detailed in the next sections, complete the “Getting Started” section of Chapter 1. This section will walk you through the installation and environment setup required for the samples in this chapter. Compiling the Session Beans and their Clients Copy the Chapter02-SessionSamples directory and its contents into a directory of your choice.
Table 2-2. Considerations for Choosing Between Local and Remote Clients • Remote Local Loose coupling between the bean and the client Lightweight access to a component Location independence Location dependence Expensive remote calls Must be collocated with the bean Objects must be serialized Not required Objects are passed by value Objects are passed by reference Web Services: You can publish stateless session beans as web services that can be invoked by Web Services clients. We will discuss Web Services and clients in Chapter 6.
Beginning EJB 3, 2nd Edition: Java EE 7 Edition by Jonathan Wetherbee, Chirag Rathod, Raghu Kodali, Peter Zadrozny