JPA: How do I get an EntityManager into a javabean

I have a javabean in a web app and I am trying to get an EntityManger but I don't think I can use resource injection. My web app is in an EAR file and my persistence unit is in a jar file that is also in the EAR file. Using the Persistence.createEntityManagerFactory doesn't work perhaps because it is only looking for a classpath?
Any ideas?
thanks,
Peter

Hey it is actually an Oracle Web Service not a Java Bean (sorry new code). But it is packaged as a war file so I added this to the web xml:
<persistence-context-ref>
          <persistence-context-ref-name>
               myEM
          </persistence-context-ref-name>
          <persistence-unit-name>VISIT_IDSM</persistence-unit-name>
     </persistence-context-ref>
on this line:
em = (EntityManager) new InitialContext().lookup("java:comp/env/myEM");
it throws this error:
08/06/04 15:58:00 com.evermind.server.ejb.exception.DeploymentException: [VIPS:vips-whit-rqs-ws-1.3-b1-001-SNAPSHOT
] - Unknown persistence unit with name "VISIT_IDSM".
looks like it still can't find that persistence unit. Both my war file and persistence jar file are packaged in an EAR file
let me know if you need any more info.
Peter

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JPA: How do I get an EntityManager into a javabean

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