[jboss-user] [EJB/JBoss] - jboss throws an exception when casting a proxy class

[jborra]

Hi all,

A casting exception is thrown when my servlet tries to bind to an EJB. I am running jboss-4.2.2.GA. Java version 1.6.0_05.

I have a servlet that tries to get a reference to a session ejb as in the following code: 

1. InitialContext initialContext = new InitialContext();
2. j2eetest.ejb.ConfigurationRemoteHome configurationRemoteHome = (j2eetest.ejb.ConfigurationRemoteHome) initialContext.lookup("ConfigurationBean");
3. ConfigurationRemote configurationRemote = configurationRemoteHome.create();

When line '2.' is executed I get the following exception:

20:42:13,140 ERROR [[/J2EETest-war]] StandardWrapper.Throwable
java.lang.ClassCastException: $Proxy71 cannot be cast to j2eetest.ejb.ConfigurationRemoteHome
        at j2eetest.J2EETester.init(J2EETester.java:39)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:623)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
        at j2eetest.Controller.processRequest(Controller.java:44)
        at j2eetest.Controller.doPost(Controller.java:85)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
        at java.lang.Thread.run(Thread.java:619)
20:42:13,140 ERROR [[J2EETester]] Allocate exception for servlet J2EETester
java.lang.ClassCastException: $Proxy71 cannot be cast to j2eetest.ejb.ConfigurationRemoteHome
        at j2eetest.J2EETester.init(J2EETester.java:39)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:623)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
        at j2eetest.Controller.processRequest(Controller.java:44)
        at j2eetest.Controller.doPost(Controller.java:85)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
        at java.lang.Thread.run(Thread.java:619)
20:42:13,140 ERROR [[Controller]] Servlet.service() for servlet Controller threw exception
java.lang.ClassCastException: $Proxy71 cannot be cast to j2eetest.ejb.ConfigurationRemoteHome
        at j2eetest.J2EETester.init(J2EETester.java:39)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:623)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
        at j2eetest.Controller.processRequest(Controller.java:44)
        at j2eetest.Controller.doPost(Controller.java:85)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
        at java.lang.Thread.run(Thread.java:619)

When inspecting JNDIView in jboss' JMX Console I see the following entry under the Global JNDI Namespace
...
  +- ConfigurationBean (proxy: $Proxy71 implements interface j2eetest.ejb.ConfigurationRemoteHome,interface javax.ejb.Handle)
...

which makes me believe that, as $Proxy71 implements the ConfigurationRemoteHome interface, there shouldn't be any problem when casting the reference returned by InitialContext.lookup(...) into the indicated type.

What could be the root of the problem I experience? 

Thank you for your help,
Jesus Borra

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