英語 での Session bean の使用例とその 日本語 への翻訳
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To create the session bean, perform the following steps.
As its name implies,there can only be a single instance of a singleton session bean in the application.
Each session bean will contain basic access methods for its respective entity class.
With EJB 3.0 Home Interfaces for Session Beans are not mandatory anymore.
Thus, the session bean(representing the session facade) manages the relationships between business objects.
In the next section you will create a session bean in an enterprise application.
The IDE also adds thePersistenceContext annotation to inject the resource directly into the session bean component.
The application client will access the session bean via the interface in the class library.
Creating the Session Bean In this exercise you will use a wizard to create a session facade for the MyEntity entity class.
The next section demonstrateshow you can access the database using the session beans and entity classes.
Securing a Method in a Session Bean In this exercise you will create a session bean in the EJB module project.
In the wizard you will also create a remote interface for the session bean in the Class Library project.
Singleton: A singleton session bean is instantiated once per application, and exists for the lifecycle of the application.
When you click Finish, the IDE creates the singleton session bean class and opens the class in the editor.
Creating the Session Bean In this exercise you will use a wizard to create a session bean in the EJB module project.
Adding a Business Method In this exercise youwill create a simple business method in the session bean that returns a string.
When you click Finish, the IDE creates the session bean in the ejb package in the EJB module and opens the class in the editor.
The session bean also manages the life cycle of these participants by creating, locating, modifying, and deleting them as required by the workflow.
Creating a Java Class Library for the Remote Interface In this exercise you will create a simple Java class libraryproject that will contain the remote interfaces for the session bean.
Testing the Session Bean In this exercise you will create a test class for the session bean that will test the addNumbers method.
The screencast demonstrates how to use wizards in the IDE to create a simple Java EE 6 webapplication that contains an EJB 3.1 stateless session bean facade for an entity class.
You will then use a wizard to create a session bean and the remote interface for your session bean in the Class Library project.
Testing a Session Bean In this section you will create a simple Java EE web application that will contain a session bean and an entity class.
You can use a wizard to easily create a Session Bean for an entity class including the appropriate annotations and commonly used default methods.
To create the singleton session bean, perform the following steps. Right-click the Web module and choose New< Other to open the New File wizard.
Support for Enterprise Java Beans 3 session beans Simplified development of session beans and message driven beans. .
When you create the session bean, the IDE will automatically create the remote interface in the class library and add the class library JAR to the classpath of the enterprise application.
Now that you have a test for your session bean and know that your entity class connection works, you can start coding a web interface for the application.
Click Finish. Creating the Session Bean In this exercise you will create a very simple session bean that contains one method that adds two numbers.
The EJB 3.0 specification simplified the creation of session beans by reducing the amount of required code andallowing the use of annotations to declare a class as a session bean.