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From "Phani Madgula" <>
Subject Re: Trying to create EntityManager in web application
Date Tue, 03 Jun 2008 11:28:43 GMT
Thanks Jacek.

On 6/3/08, Jacek Laskowski <> wrote:
> On Tue, Jun 3, 2008 at 11:52 AM, Phani Madgula
> <> wrote:
>> I was able to inject EntityManager in a servlet class by placing
>> META-INF/persistence.xml in WEB-INF/classes. Only when
>> META-INF/peristence.xml is placed in WEB-INF/classes does the web
>> application is able to read the persistence.xml (application
>> classloader is able to find it).
> I couldn't figure it out myself either why META-INF in the webapp root
> was not searched for persistence.xml's, but that's how it's in webapps
> (I guess it's because the classloader for a webapp doesn't include /
> in its classpath). It'll change in Java EE 6 (I couldn't resist
> mentioning it ;-))
> Anyway, I think you'd be better off placing your entities (or better
> the classes that constitute the model) to a separate project and
> include jar file only. It makes your model "technology clean" and no
> ties with JPA will ever exist in the model. persistence.xml and
> orm.xml would go to WEB-INF/classes/META-INF or any other jar file in
> WEB-INF/lib. It could be that  the jar file with orm.xml and
> persistence.xml files would contain these files only so it's possible
> to replace just the jar file to change the jpa configuration.
> Just a couple of ideas.
> Jacek
> --
> Jacek Laskowski

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