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POHow to avoid ClassCastException in Struts 1.3.x due to its class loading strategy?
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  1. POHow to avoid ClassCastException in Struts 1.3.x due to its class loading strategy?
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    copied!<p><strong>EDIT :</strong> I made changes since I think my question may be missing some technical details</p> <p><strong>The problem occurs in Struts 1.3.x and is described by the following :</strong></p> <p>When modify classes related to Struts (e.g ActionForm, Action, and/or any class I use with them) then I get ClassCastException when I test my modifications (<strong>Without restarting my webapp</strong>).</p> <p>If I restart my webapp after making the same modifications then there is no exception and changes made are visible when testing.</p> <p><strong>This behaviour is said to be NORMAL because of the following reasons :</strong></p> <p>My web container (weblogic) is configured to reload servlet and classes if changes are made</p> <p>I assume that a different ClassLoader is used when modifications are made to my classes. Which may causes ClassCastException.</p> <p><strong>Thus I have to restart webapp everytime I want to test my source modifications...</strong></p> <p><strong>What I wanna know is what can I do (programming pattern ? best practice ?) to avoid this kind of ClassCastException or to avoid restarting webapp to view my changes ?</strong></p> <p>Here is the stack trace :</p> <pre><code>java.lang.ClassCastException: my.package.here.MyActionClassNameHere at org.apache.struts.chain.commands.servlet.CreateAction.getAction(CreateAction.java:65) at org.apache.struts.chain.commands.AbstractCreateAction.execute(AbstractCreateAction.java:91) at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51) at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191) at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305) at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191) at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1914) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:463) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at javax.servlet.http.HttpServlet.service(HttpServlet.java:821) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201) at weblogic.work.ExecuteThread.run(ExecuteThread.java:173) </code></pre> <p>I have seen <strong>JRebel</strong> about page. It may be a solution but I am not ready to use it for my purpose (which is some <strong>very simple</strong> test using struts 1.3.x).</p> <p>I'll continue to do some parallel tests to understand a little more about this exception...</p>
 

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