Re: [eclipselink-users] JPA: Toplink / Eclipselink works in Netbeans, n

[Tom Ware <tom.ware@xxxxxxxxxx>]

Since it is your own application server, I am not sure how the classloader 
architecture works, but I can describe a bit about how Persitence.createEMF() 
works, and perhaps you can find the problem.

When you call Persistence.createEntityManagerFactory(), the Persistence class 
will go out searching for a Persistence provider service by getting a resources 
from the classloader via ClassLoader.getResources().  It looks for a file in 
"META-INF\services\" called "javax.persistence.spi.PersistenceProvider".  That 
file will contain the names of one or more classes that can provide the 
persistence service.  The persistence class will then iterate through all the 
classes that it finds and ask them in turn to create an EntityManagerFactory. 
When it finds one that returns an EntityManagerFactory, it returns that EMF.

If I were going to debug this, I would start by looking what services files are 
available to the classloader you are using by asking that classloader for those 
resources.  If you do not get the one from the eclipselink.jar, that is likely 
your problem.  If you do, then we'll have to debug further.

-Tom

dyamanoha wrote:
> !! Sorry if this is a duplicate post, I accidentally logged in under a
> different account ant it was saying that there had been no post yet. !!
>
> Hey Tom, thanks for the reply
>
>
> tware wrote:
> > What application server are you running?  What version?  Is EclipseLink
> > installed?
>
> We're trying to run our own game server. This application that we're trying
> to start up _is_ the server.
>
>
> tware wrote:
> > Based on your error message, it looks like you have TopLink Essentials but
> > not 
> > EclipseLink.
> >
> > org.eclipse.persistence.jpa.PersistenceProvider is the EclipseLink
> > persistence 
> > provider and EclipseLink will need to be available to your app server to
> > allow 
> > you to use it.
>
> Reexamining the jar tf, I found that, indeed, I have the bytecode you
> referenced above.
>
> jar tf gatewayserver.jar (output):
>
> META-INF/
> META-INF/MANIFEST.MF
> ...
> META-INF/persistence.xml
> META-INF/maven/
> META-INF/maven/com.novel.tech1/
> META-INF/maven/com.novel.tech1/gatewayserver/
> META-INF/maven/com.novel.tech1/gatewayserver/pom.xml
> META-INF/maven/com.novel.tech1/gatewayserver/pom.properties
> ...
> org/eclipse/persistence/jpa/PersistenceProvider.class
>
>
> Here's a reference to how we're attempting to load the pu (The last line of
> the class method should be the only relevant one).  Once again, this works
> from within the netbeans ide, but fails to run as a standalone jar.
>
> http://pastebin.com/XEEXbGBK