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copied!<p>The problem is, that every plugin has its own Classloader and Hibernate uses Reflection to find the right classes.</p> <p>I have a very nice article at home about exactly this problem, but this one is in German. I will try to explain what you need to do.</p> <p>In order to have the datastructure shared over several plugins, you have to put it in a plugin and enable a feature called <strong>buddy-policy</strong>. Lets say you have a main-application-plugin which is initiating hibernate on startup, this plugin needs to "see" the classes from the datastructure-plugin. To do this <strong>the main-plugin sets its Buddy-Policy to "registered" and the datastructure-plugin registers itself as a "buddy"</strong>. Unfortunately you have to do this all directly in the manifest file, at least in 3.3 there was no way to do this in the editor.</p> <p><strong>Once this buddy-policy works, Hibernate will also.</strong></p> <p>I looked up my old application and here is how I did it.</p> <ol> <li>The main-application (toolseye.rcp) is dependent on the hibernate plugin (de.eye4eye.hibernate) and the datastructure-plugin (toolseye.datastructures)</li> <li>The hibernate-plugin specifies its buddy-policy as "registered"</li> <li>The datastructure-plugin registers itself to the hibernate-plugin</li> </ol> <p>Here are the important lines:</p> <p>Hibernate-plugin de.eye4eye.hibernate</p> <pre><code>Eclipse-BuddyPolicy: registered </code></pre> <p>Datastructure-plugin toolseye.datastructures</p> <pre><code>Eclipse-RegisterBuddy: de.eye4eye.hibernate </code></pre> <p>Put those line directly in the MANIFEST.MF</p> <p>Both plugins need to reexport their packages in order that the main application or whatever layer you have in between can use them. Hope that helped.</p>

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