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Building EJB JARs 
This creates a JAR file containing all the enterprise beans and deployment descriptors of an EJB project.
The JAR file will also be created in the EJB project when an EAR file that references the EJB project is built.
1. In the J2EE Explorer view, select the EJB Module project.
2. From the context menu, choose Build jar files.
3. In the J2EE DC Explorer, select the EJB Module DC project.
4. Choose Development Component ® Build.
5. Select the projects to be built.
6. Choose OK.
A JAR file with the same name as the EJB project is created.