[jboss-user] [EJB 3.0] - JBoss EJB3 remote invocation from client app

zecas zecas do-not-reply at jboss.com
Fri May 28 10:31:38 EDT 2010


zecas zecas [http://community.jboss.org/people/zecas] created the discussion

"JBoss EJB3 remote invocation from client app"

To view the discussion, visit: http://community.jboss.org/message/545296#545296

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Hi,

I'm trying to workout an EJB example with JBoss, but I'm having some trouble understanding some things, and making other things to work.

My Environment:
- Windows XP;
- JBoss 5.1.0.GA;
- Eclipse.

The project is composed of an EAR with an EJB 3.0 and WAR module. Then I'll try to connect remotely in a client application to invoke the EJB.


So for a start, my EJB definition is:

package com.test;
 
import javax.ejb.Stateless;
 
/**
 *  Session Bean implementation class MyBean
 */
@Stateless(name =  "my-name", mappedName = "my-map")
public class MyBean implements  MyRemote, MyLocal {
 
    /**
     * Default  constructor. 
     */
    public MyBean() {
    }
 
     public String getMyCommon() {
        return "My-Common";
    }
 
     public String getMyRemote() {
        return "My-Remote";
    }
 
     public String getMyLocal() {
        return "My-Local";
    }
 
}


package com.test;
 
import javax.ejb.Local;
 
@Local
public  interface MyLocal {
 
    public String getMyCommon();
     public String getMyLocal();
 
}


package com.test;
 
import javax.ejb.Remote;
 
@Remote
public  interface MyRemote {
 
    public String getMyCommon();
     public String getMyRemote();
 
}



My ejb-jar.xml in EJB module META-INF, has no definitions:

<?xml version="1.0" encoding="ASCII"?>
<ejb-jar  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xmlns="http://java.sun.com/xml/ns/javaee"  xmlns:ejb="http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd" version="3.0">
   <display-name>my-ejb</display-name>
</ejb-jar>



My web.xml in WAR module has no reference to EJB:

<?xml version="1.0" encoding="UTF-8"?>
<web-app  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xmlns="http://java.sun.com/xml/ns/javaee"  xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID"  version="2.5">
  <display-name>my-web</display-name>
   <welcome-file-list>
     <welcome-file>index.html</welcome-file>
   </welcome-file-list>
  <servlet>
     <servlet-name>Faces Servlet</servlet-name>
     <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
     <load-on-startup>1</load-on-startup>
  </servlet>
   <servlet-mapping>
    <servlet-name>Faces  Servlet</servlet-name>
     <url-pattern>/faces/*</url-pattern>
   </servlet-mapping>
  <servlet-mapping>
     <servlet-name>Faces Servlet</servlet-name>
     <url-pattern>*.jsf</url-pattern>
   </servlet-mapping>
</web-app>



My application.xml describes the modules:

<?xml version="1.0" encoding="UTF-8"?>
<application  xmlns="http://java.sun.com/xml/ns/javaee"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  http://java.sun.com/xml/ns/javaee/application_5.xsd" version="5">
   <display-name>my-ear</display-name>
  <module>
     <web>
       <web-uri>my-web-0.0.1-SNAPSHOT.war</web-uri>
       <context-root>/my-web</context-root>
    </web>
   </module>
  <module>
     <ejb>my-ejb-0.0.1-SNAPSHOT.jar</ejb>
  </module>
</application>



The WAR has a small test page, that injects the @EJB local interface, and successfully gets data, so I assume no other config should be necessary (for now, at least).


For deployment, I just copied the EAR to deploy directory. No errors, and checking JMX Console I can find the following info:

jboss.deployment
#  id="jboss.j2ee:ear=my-ear-0.0.1-SNAPSHOT.ear,jar=my-ejb-0.0.1-SNAPSHOT.jar,name=my-name,service=EJB3",type=Component
#   id="jboss.j2ee:ear=my-ear-0.0.1-SNAPSHOT.ear,jar=my-ejb-0.0.1-SNAPSHOT.jar,name=my-name,service=EJB3_endpoint",type=Component



I then created a small standalone project, with following code:

        Hashtable environment = new Hashtable();
 
         environment.put(Context.INITIAL_CONTEXT_FACTORY,  "org.jnp.interfaces.NamingContextFactory");
         environment.put(Context.URL_PKG_PREFIXES,  "org.jboss.naming:org.jnp.interfaces");
         environment.put(Context.PROVIDER_URL, "jnp://127.0.0.1:1099"); // remote  machine IP
 
        InitialContext context = null;
         try {
            context = new InitialContext(environment);
             Object obj = context.lookup("my-name");
             System.out.println("-->> lookup object successfully");
 
         } catch(Throwable ex) {
            ex.printStackTrace();
         } finally {
            if( context!=null ) {
                 context.close();
            }
        }



When executing, I get the exception:

javax.naming.NameNotFoundException: my-name not bound
    at  org.jnp.server.NamingServer.getBinding(NamingServer.java:771)
    at  org.jnp.server.NamingServer.getBinding(NamingServer.java:779)
    at  org.jnp.server.NamingServer.getObject(NamingServer.java:785)
    at  org.jnp.server.NamingServer.lookup(NamingServer.java:443)
    at  sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
    at  sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)
     at sun.rmi.transport.Transport$1.run(Transport.java:159)
    at  java.security.AccessController.doPrivileged(Native Method)
    at  sun.rmi.transport.Transport.serviceCall(Transport.java:155)
    at  sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
     at  sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
     at  sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
     at  java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
     at  java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
     at java.lang.Thread.run(Thread.java:619)
    at  sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
     at  sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)
    at  org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
    at  org.jnp.interfaces.NamingContext.lookup(NamingContext.java:528)
     at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:507)
     at javax.naming.InitialContext.lookup(InitialContext.java:392)



Changing the lookup to:

Object obj = context.lookup("my-map");


Works ok. Lookup goes successfull.


Replacing with:

MyRemote myRemote = (MyRemote) context.lookup("my-map");



Will return:

java.lang.ClassCastException: javax.naming.Reference cannot be cast to  com.test.MyRemote



My client application has dependency to the EJB client jar, which only has MyRemote and MyLocal classes, and a dependency to jbossall-client-3.2.3.jar.


If I narrow:

MyRemote myRemote = (MyRemote) PortableRemoteObject.narrow(
                 context.lookup("my-map"),
                MyRemote.class
                 );



I'll get:

java.lang.ClassCastException
    at  com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)
     at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
     ... 2 more
Caused by: java.lang.ClassCastException:  javax.naming.Reference cannot be cast to org.omg.CORBA.Object
    at  com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:212)
     ... 3 more



What am I doing wrong?


Thanks

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