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<p style="margin: 10px 0 0 0">Yes .. we also encountered this problem in aries jpa. The simplest solution is of course to let the user create Import-Package statements for these two packages. This requires that the user is sure to use hibernate though and he will also encounter no build time error if he forgets it. For some of the aries tests I used a little more flexible solution to add Dynamic-Import statements to the bnd config. This has the advantage that it works with hibernate but also does not cause problems if the user uses another provider.</p>
<p style="margin: 10px 0 0 0">There is also a completely automatic solution that uses the ClassTransformer that can be set by the provider. It uses an OSGi weaving hook and provides two things. It calls the transformer to do the weaving and also adds dynamic import statements to the persistence bundle. So this also works if the user did not do any precautions. <br /> See: <a href="https://github.com/apache/aries/blob/trunk/jpa/jpa-container/src/main/java/org/apache/aries/jpa/container/weaving/impl/JPAWeavingHook.java" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/apache/aries/blob/trunk/jpa/jpa-container/src/main/java/org/apache/aries/jpa/container/weaving/impl/JPAWeavingHook.java</a></p>
<p style="margin: 10px 0 0 0">At the moment I just add the imports with known dynamic imports for eclipselink and openjpa which use the ClassTransformer. This is not a good solution but I am not sure if the ClassTansformer is a good solution anyway. </p>
<p style="margin: 10px 0 0 0">What I would suggest is that hibernate uses its own BundleTracker to track bundles in resolved state that need enhancement. It could then install a weaving hook for these bundles and apply the transformation as well as adding the dynamic imports. The reason why I would prefer this is that only hibernate can know what packages the current enhancement solution needs and there is no standard to communicate this in OSGi. So I think it would be best if each provider does the enhancement on its own. We could then simply remove the enhancement support in aries jpa. As a way to communicate that enhancement should be done a persistence unit bundle could use a special Require-Capability header and the hibernate bundle could provide this capabiltiy. This would also solve the timing issue as the user bundle would only be resolved when the capability is present. So the hibernate bundle would have the chance to register its BundleTracker early enough that no timing problems can occur. If you are interested in such a solution I could provide a proof of concept bundle that would do this for the hibernate runtime- as well as load-time weaving.</p>
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