JBoss EJB3 remote invocation from client app
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
