Developing Business Logic with EJB 3.0 

Use

EJB components are an essential part of Java EE applications. In the SAP NetWeaver Developer Studio, you create EJB 3.0 components (as of the Java EE 5 specification) in EJB 3.0 Projects.

More information: EJB Overview

Procedure

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       1.      Create an EJB 3.0 Project.

More information: Creating EJB 3.0 Projects in the Developer Studio.

       2.      Use the corresponding wizards to create enterprise beans and helper classes.

More information: Creating Session Beans in the Developer Studio and Creating Message-Driven Beans in the Developer Studio.

       3.      Implement the source code.

You can use the following features:

○       (Optional) Use dependency injection to use external resources.

More information: Using Dependency Injection

○       (Optional) Change the default transaction configuration in which the EJB runs.

More information: Specifying Transaction Attributes

○       (Optional) Specify the security roles that are allowed to invoke the EJB methods using the security-related metadata annotations.

More information: Specifying Security

○       (Optional) Program and configure the business interceptor method or life cycle callback interceptor method.

More information: Using Interceptors and Life Cycle Callbacks

○       (Optional) Use Java Persistence API.

More information: Using Java Persistence API (JPA)

○       (Optional) Expose your Enterprise JavaBeans as Web service endpoints.

More information: Using Enterprise JavaBeans as Web Service Endpoints

       4.      (Optional) Edit the EJB deployment descriptors to configure the application.

More information: Editing the ejb-j2ee-engine.xml.

       5.      (Optional) Access Enterprise JavaBeans from non-Java EE applications.

More information: Accessing Enterprise JavaBeans from Non-Java EE Applications

       6.       (Optional) If you want to provide methods to allow callbacks to be scheduled for time-based events, use the EJB Timer service.

More information: Using Timers

       7.      If you have not done so initially, add the EJB 3.0 Project to an Enterprise Application.

More information: Creating Enterprise Application 5 Projects.