Hi Benjamin,
Ian was thinking about something else ;)
You should be either able to inject an EMF or lookup an EM. See BluePrints
article at
https://blueprints.dev.java.net/bpcatalog/ee5/persistence/webonlyapp.html
thanks,
-marina
Benjamin Graf wrote:
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> Hmm,
>
> your response makes be surprised. I used that code (generated by NetBeans for
> this special problem) while working with a persistence unit scope in the web
> application. But the same code doesn't work if the scope is in the enterprise
> application? As far as I know the Persistence class should be used in the J2SE
> environment so I'm not sure I can also use it in the glassfish environment.
>
> Best regards,
> Benjamin
>
> Ian Evans wrote:
>
>>Benjamin Graf <Benjamin.Graf_at_gmx.net> wrote:
>>
>>>one problem is still there. How can I access this global defined
>>>persistence unit. I tried an lookup,
>>>
>>>Context ctx = new InitialContext();
>>>em = (EntityManager)
>>>ctx.lookup("java:comp/env/persistence/LogicalName");
>>>persistence/LogicalName registered in web.xml
>>>
>>>but the EntityManager was null.
>>
>>In a web application that can't do resource injection, you use an
>>EntityManagerFactory to create entity managers. You can't look up entity
>>managers through JNDI.
>>
>>EntityManagerFactory emf =
>>Persistence.createEntityManagerFactory("PersistenceUnitName");
>>EntityManager em = emf.createEntityManager();
>>
>>If your web app is a servlet or has a JSF backing bean, you can inject
>>the persistence unit just as you would in a session bean.
>>
>>I suggest you read the "Persistence in the Web Tier" chapter and look at
>>the bookstore examples in the Java EE Tutorial. They demonstrate
>>different strategies in web apps. For example, bookstore2 uses a servlet
>>context listener to inject the entity manager factory.
>>
>>-i
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