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classloading and remote access in ejb3
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created by <a href="http://community.jboss.org/people/lodrantj">Jure Lodrant</a> in <i>EJB3</i> - <a href="http://community.jboss.org/message/570450#570450">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi guys</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I love the dynamic classloading features of Java but it seems sometimes love is not enough, I'm lacking knowledge about it. Here it goes:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm using JBPM 3.2 in my EJB3 / web based app. JBPM is hidden in EJB3 layer. Now, I'd like to make a clear separation between everything process related on one side and the web part on the other. So I figured I'd just add some GUI content generating classes into the jbpm par archive, dynamically load them through a par classloader and simply send them as Class objects to the client. That was the theory.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>So far, of course, it doesn't work. I simple get an exception on Class.newInstance call on the client. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>On the second ran, I tried to call Class.newInstance inside the EJB and return the Object to the client as an implementation of a known interface. All I got was ClassNotFoundExceptions.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Now, before I dig any further, the question: Do I have I shot here, or am I just plain lurking in the impossible land?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>It's basically down to this: Can a remote EJB expose a method returning an interface, of which the implementing class is dynamically evaluated and - this is vital - is not present on the client?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Please, advise!</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you..</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Jure</p></div>
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