Simple session bean

[anonym365454]

Hi!
I'm totally new to Jboss and to EJB. I am trying to make a simple Session (stateless) Bean that will just output some HelloWorld.
I don't have difficulties creating the Bean, the business method, the ejb-jar.xml and the jboss.xml, the interfaces (Hello.java & HelloHome.java).

What I want to do is simply to launch a small client application that will use the EJB deployed on the server to output the helloworld.

For that, I created (actually launched the creation) of TestHello.java the test client.

After that I don't know what to do!
I think that I will need an application-client.xml file but I don't know how to create it, and I don't know how to launch the client...

If anyone has an idea, or has a tutorial to give, I'd appreciate!
(I already looked at the tutorial for Eclipse IDE + Jboss (I'm using eclipse...) but it doesn't help a lot since it's using servlets and lots of stuffs I never heard about...))

Thank you!

[anonym365454]

Please help me!

[peterj]

This is the client code I use to access my stateless session bean:

public void main(String[] args) throws Exception {
 Hashtable env = new Hashtable();
 env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
 env.put(Context.PROVIDER_URL, "localhost:1099");
 Context ctx = new InitialContext(env);
 Object obj = ctx.lookup("HelloRemote");
 HelloRemoteHome home = (HelloRemoteHome)PortableRemoteObject.narrow(obj, HelloRemoteHome.class);
 HelloRemote hello = home.create();
 System.out.println(hello.sayHello());
}

You will, of course, have to change the above code to conform with the names of the classes and methods associated with your session bean.

[anonym365454]

First of all, thanks a lot for your answer!
I tried but I still get some errors (hopefully different ones!)
This is the error I get:

javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:652)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
at javax.naming.InitialContext.init(InitialContext.java:219)
at javax.naming.InitialContext.(InitialContext.java:195)
at tutorial.ejb.Client.main(Client.java:17)
Caused by: java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:219)
at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:42)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:649)
... 4 more
Exception in thread "main"








And this is your code with my methods:
package tutorial.ejb;

import java.util.Hashtable;
import javax.rmi.PortableRemoteObject;
import javax.naming.Context;
import javax.naming.InitialContext;
import tutorial.interfaces.*;


public class Client {


public static void main(String[] args) throws Exception {
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
env.put(Context.PROVIDER_URL, "localhost:1099");
Context ctx = new InitialContext(env);
Object obj = ctx.lookup("HelloRemote");
FiboHome home = (FiboHome)PortableRemoteObject.narrow(obj, FiboHome.class);
Fibo hello = home.create();
System.out.println(hello.compute(1)[2]);
}
}



Do you know where could my problem come from?

[anonym365454]

Ok I corrected the "HelloRemote" by "Fibo" in my code but it still doesn't work...

[peterj]

Did you include the client/jbossall-client.jar file in your classpath for your client?

[anonym365454]

First of all, thank you for your help!
I added the jbossall-client.jar but it still doesn't work...

I think that I am missing smg huge...
Let me explain what I want to do so that maybe you can lead me to the right solution:
What I want is simply to deploy an EJB and access it locally with my little client application. The statless EJB will just print out a simple "Helloworld"

I am using jboss Eclipse IDE, and I launched the creation of an EJB, and then added a business method that looks like this:


public void Affichage() {
// TODO Auto-generated method stub
System.out.println("Helloworld");
}


I launched the Xdoclet generation after entering all the information needed, and what I have next is the following:

-source
...-tutopack.ejb
.....+Hello.java
.....+HelloBean.java
.....+HelloHome.java
.....+Client.java
.....+ejb-jar.xml
.....+jboss.xml
+JRE System Library [JRE 5]
+javax.servlet.jar
+jboss-j2ee.jar
+JRE System Library [JDK 1.4 2005Q1]
+JUnit Libraries (Jboss-IDE)
+jbossall-client.jar
-Adrien.ear
-application.xml
-HelloBean.jar
-HelloTestClient.jar
-packaging-build.xml
-xdoclet-build.xml



My packaging looks like this:

HelloBean.jar
+/Tuto4/output/ejb-jar.xml -> META-INF
+/Tuto4/output/jboss.xml -> META-INF
+/Tuto4/application.xml -> META-INF
+/Tuto4/source/tutopack/ejb/Hello.java
+/Tuto4/source/tutopack/ejb/HelloBean.java
+/Tuto4/source/tutopack/ejb/HelloHome.java

HelloTestClient.jar
+/Tuto4/output/tutopack/ejb/Client.java
+/Tuto4/application.xml -> META-INF

Adrien.ear
+/Tuto4/HelloBean.jar
+/Tuto4/application.xml ->META-INF




I suspect a LOT of errors in that, but since I'm a total beginner to jBoss and EJB (never actually managed to see an EJB working...) I don't know where to look...

Once more, thank you very much for your support because I'm totally lost with that. I would really like to find a tutorial somewhere for total beginners in EJB, but I can't, everytime I find one it's running on a different server (not jboss) and I get confused. The only tutorial with jboss and Eclipse I found is using those servlets...

[peterj]

I really don't see anything specifically wrong based on the file information you posted. But, when you changed your classpath, you should have now gotten a different error message, but since you didn't post the new error, I can't tell what is still wrong (possibly you are not including your ejb jar file in the client classpath?).

I decided to post a full EJB. I am using JBoss 4.0.3SP1, Sun JVM 1.5.0_06, XDoclet 1.2.3 and Ant 1.6.5.

File: src/main/java/peter/HelloBean.java

package peter;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
/**
 * @ejb.bean name="Hello" display-name="HelloBean" jndi-name="HelloRemote"
 * type="Stateless" transaction-type="Container" view-type="remote"
 */
public class HelloBean implements SessionBean {
 private SessionContext ctx;
 public void setSessionContext(SessionContext ctx) throws EJBException,
 RemoteException {
 this.ctx = ctx;
 }
 public void ejbRemove() throws EJBException, RemoteException {}
 public void ejbActivate() throws EJBException, RemoteException {}
 public void ejbPassivate() throws EJBException, RemoteException {}
 public void ejbCreate() throws CreateException {}
 /**
 * @ejb.interface-method view-type="remote"
 * @ejb.transaction type="Supports"
 */
 public String sayHello() throws EJBException {
 return "You say good-bye, but I say hello.";
 }
}

File: src/main/java/peter/Client.java

package peter;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
public class Client {
 public static void main(String[] args) throws Exception {
 Hashtable env = new Hashtable();
 env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
 env.put(Context.PROVIDER_URL, "localhost:1099");
 Context ctx = new InitialContext(env);
 Object obj = ctx.lookup("HelloRemote");
 HelloRemoteHome home = (HelloRemoteHome)PortableRemoteObject.narrow(obj, HelloRemoteHome.class);
 HelloRemote hello = home.create();
 System.out.println(hello.sayHello());
 }
}

File: build.xml

<project name="helloejb" default="all" basedir=".">
 <property environment="env" />
 <property name="dir.java" location="src/main/java" />
 <property name="dir.gen.java" location="target/gen/java" />
 <property name="dir.gen.ejb" location="target/gen/ejb" />
 <property name="dir.class" location="target/classes" />
 <property name="dir.dist" location="target" />
 <property name="jar.name" value="${ant.project.name}.jar" />
 <property name="jar.path" location="${dir.dist}/${jar.name}" />
 <path id="compile.classpath">
 <fileset dir="${env.XDOCLET_HOME}/lib" includes="**/*.jar" />
 <fileset dir="${env.JBOSS_HOME}/client" includes="**/*.jar" />
 </path>
 <target name="all" depends="jar" />
 <target name="clean">
 <delete dir="target" includeemptydirs="true" />
 </target>
 <target name="compile">
 <mkdir dir="${dir.class}" />
 <javac debug="true" srcdir="${dir.java}:${dir.gen.java}" destdir="${dir.class}">
 <classpath refid="compile.classpath" />
 </javac>
 </target>
 <target name="jar" depends="ejbdoclet, compile">
 <mkdir dir="${dir.dist}" />
 <jar destfile="${jar.path}">
 <fileset dir="${dir.class}" />
 <metainf dir="${dir.gen.ejb}" />
 </jar>
 </target>
 <target name="ejbdoclet">
 <taskdef name="ejbdoclet"
 classname="xdoclet.modules.ejb.EjbDocletTask"
 classpathref="compile.classpath"
 />
 <mkdir dir="${dir.gen.java}" />
 <mkdir dir="${dir.gen.ejb}" />
 <ejbdoclet destdir="${dir.gen.java}" ejbspec="2.1">
 <fileset dir="${dir.java}">
 <include name="**/*Bean.java" />
 </fileset>
 <remoteinterface pattern="{0}Remote" />
 <homeinterface pattern="{0}RemoteHome" />
 <deploymentdescriptor destdir="${dir.gen.ejb}" />
 <jboss version="4.0" destdir="${dir.gen.ejb}" />
 </ejbdoclet>
 </target>
</project>

To use:

1) Create the above files
2) Set the XDOCLET_HOME and JBOSS_HOME environment variables
3) Build using Ant
4) Copy the ejbhello.jar file to JBOSS_HOME/server/default/deploy
5) Start JBoss
6) Run the client, as follows (assumes Windows, adjust for *nix):

java -cp target\classes;%JBOSS_HOME%\client\jbossall-client.jar peter.Client