9:31 a.m.
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
--------------------------------------------------------------
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
--------------------------------------------------------------
Reply to this message by going to Community
[http://community.jboss.org/message/545296#545296]
Start a new discussion in EJB 3.0 at Community
[http://community.jboss.org/choose-container!input.jspa?contentType=1&...]