Enterprise Java Beans (EJBs) V2

The Java TM 2 Platform, Enterprise Edition (J2EE TM) is a Java platform that defines the standard for developing multi-tier enterprise applications. J2EE simplifies enterprise applications by basing them on standardized, reusable modular components, it provides a complete set of services to those components, and handles many details of application behavior automatically without complex programming.

PowerDesigner supports the EJB 2.0 specification, with special emphasis on entity beans (both CMP and BMP), and allows you to take full advantage of the tight integration between the PDM and OOM.

To work with EJB 2.0, you require Java 2 SDK Standard Edition (J2SE TM) 1.3 (final release), Java 2 SDK Enterprise Edition (J2EE TM) 1.3 (final release), a Java IDE or a text editor and a J2EE application server supporting EJB 2.0.

We recommend that you add the JAVA_HOME and J2EE_HOME system variables in your environment as follows:

%JAVA_HOME%\lib;%J2EE_HOME%\lib\j2ee.jar;%J2EE_HOME%\lib

%JAVA_HOME%\bin;%J2EE_HOME%\bin

For detailed information on EJB, see the Oracle Java Web site, at http://www.oracle.com/technetwork/java/index.html.

• Using EJB Types
  You can define the following types of EJB components:
• EJB Properties
  The EJB tab in the component property sheet provides additional properties.
• Creating an EJB with the Wizard
  You can create an EJB component with the wizard that will guide you through the creation of the component. It is only available if the language is Java.
• Defining Interfaces and Classes for EJBs
  An EJB comprises a number of specific interfaces and implementation classes. Interfaces of an EJB are always exposed, you define a public interface and expose it. You can attach an interface or class to only one EJB at a time.
• Defining Operations for EJBs
  You can create the following types of operations for an EJB from the property sheet of the Bean class or EJB interfaces:
• Understanding EJB Support in an OOM
  PowerDesigner simplifies the development process by transparently handling EJB concepts and enforcing the EJB programming contract.
• Previewing the EJB Deployment Descriptor
  An EJB deployment descriptor describes the structure and properties of one or more EJBs in an XML file format. It is used for deploying the EJB in the application server. It declares the properties of EJBs, the relationships and the dependencies between EJBs. One deployment descriptor is automatically generated per package or model, it describes all EJBs defined in the package.
• Generating EJBs
  The EJB generation process allows you to generate EJB source code that is compliant with J2EE 1.3 (EJB 2.0). The code generator (Java, EJB, XML, etc...) is based on templates and macros. You can customize the generated code by editing the Java object language from Tools > Resources > Object Languages.
• Generating JARs
  In order to package the EJB, the bean classes, interfaces and the deployment descriptor are placed into a .JAR file. This process is common to all EJB components.
• Reverse Engineering EJB Components
  PowerDesigner can reverse engineer EJB components located in .JAR files.