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From Rick Curtis <>
Subject Re: newbie: null Entity Manager Factory in Eclipse
Date Mon, 20 Jul 2009 14:06:01 GMT
It sounds like your META-INF/persistence.xml file isn't found on your
classpath when running your RCP application. I really wish that
createEntityManagerFactory would do something other than return null if a
persistence unit isn't found.

I'd suggest taking a close look at the classpath for your RCP application.
Hopefully this helps!


On Mon, Jul 20, 2009 at 8:50 AM, Christopher Giblin <>wrote:

> Hi,
> When I run my test as a standalone Java program, things work.
> When I launch the same code from within a plugin in an Eclipse RCP app,
> Persistence.createEntityManagerFactory returns null.
> I have called Persistence.createEntityManagerFactory both ways, with and
> without persistence.xml. Get null both ways.
> I have googled and have done everything recommended in those posts,
> including initializing the factory with properties and making sure the jdbc
> driver is on the class path. Still get null.
> I feel I am now going round in circles. Any hints?
> Thanks, chris

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