I must admit I'm quite illiterate when it comes to Eclipse --ditched it a long time ago in favor of Idea. You must be right about the build.xml being a not-so-straightforward root for Eclipse import, it didn't occur to me that it could be used that way. Having said that, here's my (purely speculative) comments about the problem you're having:

[java] javax.persistence.PersistenceException: Invalid or inaccessible
provider class: org.apache.openjpa.persistence.PersistenceProviderImpl
    [java] at
That sure looks like a classpath problem to me, and the fact that it's coming from ant..ExecuteJava is somewhat telling, the Eclipse-generated build.xml is running a <java ..> task instead of an <openjpac> task, possibly with a different classpath.

Is the use of <taskdef name="openjpac" classname="
the equivalent of what is done for the examples with

               Specifying the openjpa jar as the javaagent argument is
necessary in order for automatic class-enhancement to work.
           <jvmarg value="-javaagent:${javaagent}"/>    ?

<openjpac> task performs a build-time class enhancement, whereas the "-javaagent" method performs a run-time enhancement, you can use either as long as the environment is setup properly. Since the above exception is coming from a <java> task, I'm assuming you're using run-time enhancement method, then it boils down to setting the correct classpath entries.

If you can post the relevant parts of your build.xml, it'll be easier to spot the problem.


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