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This section discusses the standard EJB deployment descriptor,

Enterprise Deployment Wizard Helps you with the entire development, assembly, and deployment process, including configuration of container-managed persistence for CMP entity beans. It is also ideal for creating deployment descriptors for existing EJB code. You can use the Enterprise Deployment Wizard as a stand-alone application or with Borland JBuilder or Forte for Java. For more information, see JRun Programmer's Guide.

XDoclet is an open source tool that generates EJB interfaces and deployment descriptors based on special Javadoc comments in a bean implementation source file. The JRun installation includes XDoclet. JRun extends XDoclet to support JRun-specific deployment descriptors, and provides automatic compilation. For more information, see JRun Programmer's Guide and the XDoclet website at http://xdoclet.sourceforge.net.

for read more information:
http://livedocs.macromedia.com/jrun/4/Assembly_and_Deployment_Guide/descriptors5.htm