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POClassCastException with GWT/RequestFactory on WebLogic
 

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    <p>I'm setting up a GWT application based on GWT/RequestFactory on client side, and JPA/EclipseLink over WebLogic on server side.</p> <p>However, during development, everytime I change something on the server-side code (it can be an entity, the DAO, or even a comment in a Java file!), I get a <code>ClassCastException</code> between 2 apparently similar classes when I try to use my application, and the only way to get rid of it is to restart my WebLogic server. Even redeploying the application doesn't help.</p> <blockquote> <p>Feb 10, 2012 4:08:10 PM com.google.web.bindery.requestfactory.server.RequestFactoryServlet doPost SEVERE: Unexpected error java.lang.ClassCastException: com.mycompany.MyClass cannot be cast to com.mycompany.MyClass at com.mycompany.server.locator.CodeLevelLocator.getId(MyClassLocator.java:1) at com.google.web.bindery.requestfactory.server.LocatorServiceLayer.doGetId(LocatorServiceLayer.java:168) at com.google.web.bindery.requestfactory.server.LocatorServiceLayer.getId(LocatorServiceLayer.java:66) at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.getId(ServiceLayerDecorator.java:81)</p> </blockquote> <p>Any idea how to avoid this server restart?</p> <p>Thanks.</p> <p><em>EDIT</em>: I'm setting up a bounty on this, because restarting WebLogic after each server change is really painful!!!</p> <p><em>EDIT2</em> solved thanks to James by adding the following ServletContextListener:</p> <pre><code>public class DeploymentListener implements ServletContextListener { private static Logger log = LoggerFactory .getLogger(DeploymentListener.class.getName()); @Override public void contextDestroyed(ServletContextEvent arg0) { try { // close the Entity Manager Factory. EMF.close(); } catch (Exception e) { log.error("Error closing the Entity Manager Factory", e); } } @Override public void contextInitialized(ServletContextEvent arg0) { // nothing to do } } </code></pre>
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    1. COI'm not really qualified to answer, but I can suggest this: The error looks like a classloader issue, where the jvm apparently has two different declarations for the same class from two classloaders, and so considers them to be different classes. Most servlet containers use a specialized classloader to keep apps isolated from eachother, and to allow apps to be redeployed - my guess is that this isn't working correctly in your case.
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    2. COThanks for the hint, but here I believe there's something here specific to [GWT/RequestFactory](http://code.google.com/webtoolkit/doc/latest/DevGuideRequestFactory.html). Maybe any user of GWT around here have came across this issue?
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    3. COI'm actually a GWT developer first and foremost, and use RF in most of my projects, but I know just enough of the classloader issues to offer that suggestion. I've never seen that issue in redeploying RF classes to Jetty or Tomcat.
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