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 .

The following picture illustrates the overall EJB development process.

The following picture focuses on the PowerDesigner part, and highlights the role of O/R Mapping generation. The O/R mapping can be created when generating a PDM from an OOM or generating an OOM from a PDM.

For more information on object mapping, see O/R Mapping Modeling.

When generating an EJB, a typical generation process could be to:

• What Kind of Generation to Use?
  You may face two situations when generating EJB source code:
• Understanding EJB Source and Persistence
  You generate persistence management methods based on the object language. Depending if the EJB is of a CMP or BMP type, the deployment descriptor file is displayed different:
• Generating EJB Source Code
  When generating an EJB, classes and interfaces of the EJB are directly selected. The generation retrieves the classes used by the component, as well as the interfaces associated with the classes.
• Generating EJB Deployment Descriptor
  The EJB deployment descriptor is an XML file called ejb-jar.XML generated in the META-INF directory. It is independent from the application server.
• Generating O/R Mapping for an Application Server
  Object to relational mapping allows you to generate objects from an Object-Oriented Model into a Physical Data Model. It is the process of having classes, attributes and operations mapped to relational tables, columns and queries by using DBMS compliant codes for OOM objects generated into the PDM. The purpose is to set up object storage in a relational database.
• Choosing a Target Application Server
  You can import an extended model definition in the current model, generate the specific descriptors of an application server, or choose an O/R mapping tool as follows:

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Created October 7, 2009. Send feedback on this help topic to Sybase Technical Publications: pubs@sybase.com