EJB 3 RemoteInterface class cast exception during lookup

StackOverflow https://stackoverflow.com/questions/21780519

Domanda

I am using WebSphere Application Server 8.0.0.1. I have two enterprise applications running in same jvm (at the moment).

I need to call an EJB-method remotely

  1. Application ("service") Interface:

    package myfirstpackage.ejb3;
@Remote
public interface TriggerManually {
    public boolean runTask(String taskName);
    public boolean resetTasks();
}

    Implementation:

    package anotherpackage.ejb.remoteclient;
@Stateless
public class TriggerManuallyBean implements TriggerManually {
    @Override
    public boolean runTask(String taskName) {
        //Syso...
        return false;
    }

    @Override
    public boolean resetTasks() {
        //Syso...
        return false;
    }

}

  2. Application ("client") uses the service (the interface is shared)

    public class TriggerManuallyClient {
  public void test() {
    Properties props = new Properties();

    props.put(Context.INITIAL_CONTEXT_FACTORY,
            "com.ibm.websphere.naming.WsnInitialContextFactory");
    props.put(javax.naming.Context.PROVIDER_URL, "iiop://localhost:2811");

    TriggerManually triggerManually;
    try {
        InitialContext ctx = new InitialContext(props);
        triggerManually = (TriggerManually) ctx
                .lookup("myjdniname");
        triggerManually.resetTasks();

    } catch (NamingException e) {
        e.printStackTrace();
    }
  }
}

But I get a Class Cast Exception during lookup:

Exception created : [java.lang.ClassCastException: myfirstpackage.ejb3._TriggerManually_Stub incompatible with anotherpackage.ejb.remoteclient.TriggerManually
    at anotherpackage.ejb.remoteclient.TriggerManuallyClient.test(TriggerManuallyClient.java:20)
    at com.ibm._jsp._status._jspService(_status.java:112)
    at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJspBase.java:99)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1147)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:722)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:449)
    at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
    at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:122)
    at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:205)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.invokeTarget(WebAppFilterChain.java:125)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:77)
    at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:919)
    at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1016)
    at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:886)
    at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1655)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:195)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
    at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:83)
    at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
    at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
    at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
    at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
    at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
    at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
    at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1650)

I thougt in EJB 3 i dont have to create stubs. How can I solve my issue?

È stato utile?

Soluzione

The problem is not the stub (and yes those still exist in EJB3) returned via lookup.

Look carefully at the ClassCastException:

myfirstpackage.ejb3._TriggerManually_Stub incompatible with anotherpackage.ejb.remoteclient.TriggerManually

You probably have a TriggerManually class in package anotherpackage.ejb.remoteclient as well.

This will probably fix it:

myfirstpackage.ejb3.TriggerManually triggerManually;
try {
    InitialContext ctx = new InitialContext(props);
    triggerManually = (myfirstpackage.ejb3.TriggerManually) ctx.lookup("myjdniname");
    triggerManually.resetTasks();

} catch (NamingException e) {
    e.printStackTrace();
}

Altri suggerimenti

Clean build your project in Maven.

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