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POClassCastException When Calling an EJB Remotely that Exists on Same Server
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  1. POClassCastException When Calling an EJB Remotely that Exists on Same Server
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    copied!<p>I have 2 ejbs. Ejb-A that calls Ejb-B. They are not in the same Ear. </p> <p>For portability Ejb-B may or may not exist on the same server. (There is an external property file that has the provider URLs of Ejb-B. I have no control over this.) </p> <p>Example Code: in Ejb-A</p> <pre><code>EjbBDelegate delegateB = EjbBDelegateHelper.getRemoteDelegate(); // lookup from list of URLs from props... BookOfMagic bom = delegateB.getSomethingInteresting(); </code></pre> <hr> <p><strong>Use Cases/Outcomes</strong>:</p> <ol> <li>When Ejb-B <strong>DOES NOT EXIST</strong> on the same server as Ejb-A, everything works correctly. (it round-robbins through the URLs)</li> <li>When Ejb-B <strong>DOES EXIST</strong> on the same server, and Ejb-A happens to call Ejb-B on the same server, everything works correctly.</li> <li>When Ejb-B <strong>DOES EXIST</strong> on the same server, and Ejb-A calls Ejb-B on a different server, I get:</li> </ol> <blockquote> <p>javax.ejb.EJBException: nested exception is: java.lang.ClassCastException: $Proxy126 java.lang.ClassCastException: $Proxy126</p> </blockquote> <p>I'm using Weblogic 10.0, Java 5, EJB3</p> <p>Basically, if Ejb-B Exists on the server, it must be called ONLY on that server. </p> <p>Which leads me to believe that the class is getting loaded by a local classloader (on deployment?), then when called remotely, a different classloader is loading it. (causing the Exception) But it should work, as it should be Serialized into the destination classloader...</p> <p>What am I doing wrong?? </p> <p>Also, when reproducing this locally, Ejb-A would favor the Ejb-B on the same server, so it was difficult to reproduce. But this wasn't the case on other machines.</p> <p>NOTE: This all worked correctly for EJB2</p>
 

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