complete working ejb3 helloworld session bean jbos

下面是一个完整的EJB3 session bean的 HelloWorld 例子，环境：Eclipse +JBoss

 

1.Download

 i downloaded jboss 4.2.2.GA and extracted it here:
C:\Program Files\jboss

2. start eclipse

3. install jbosstools
help > software updates > find and install > search for new features to install > new remote site:
name: jboss
url: http://download.jboss.org/jbosside/updates/stable

put a check mark next to "jboss" > Finish
install all the jboss stuff
restart eclipse

4. create a new ejb3 project
file > new > Project (the white icon , NOT the purple one) > EJB > EJB Project
next

Project name: MyFirstEJBProject
Target runtime: JBoss 4.2 runtime
Configurations: Default
finish

5. create EJB3 session bean
highlight MyFirstEJBProject in the project explorer
(rightclick) > new > other > EJB > EJB3 Session Bean
next

bean package: myejb3test
bean name: EJB3HelloWorld
finish

6. configure the project environment
highlight MyFirstEJBProject in the project explorer
(rightclick) > properties:

java build path > libraries > jre system library:
make sure this is an updated version of the java jre (i think you need java 5+, i am using jre1.6.0_6)

server > choose JBoss 4.2 server > apply
If it is not in the list of servers then just set up a new server:
close that properties window
file > new > other > server > server
next
JBoss, a division of Red Hat > JBoss AS, 4.2
next
available projects: highlight MyFirstEJBProject and then push the Add button to add it to Configured Projects
finish

7. write your bean code
expand the ejbModule folder > expand the myejb3test folder:

open EJB3HelloWorld.java
paste in this code:

package myejb3test;

import javax.ejb.Remote;

@Remote
public interface EJB3HelloWorld {
    public void sayHello(String text);
}

 open EJB3HelloWorldBean.java
paste in this code:

package myejb3test;

import javax.ejb.Stateless;
import myejb3test.EJB3HelloWorld;

public @Stateless class EJB3HelloWorldBean implements EJB3HelloWorld {
    public void sayHello(String hello) {
        System.out.println(hello);
    }
}

 right click myejb3test in the project explorer > new > class
name: EJB3HelloWorldClient
put a check mark by public static void main(String[] args)
finish

open EJB3HelloWorldClient.java
paste in this code:

package myejb3test;

import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class EJB3HelloWorldClient {

    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("java.naming.factory.initial", "org.jboss.naming.HttpNamingContextFactory" );
        props.put("java.naming.provider.url", "http://localhost:8080/invoker/JNDIFactory");
        props.put("java.naming.factory.url.pkgs", "org.jboss.naming");
        
        try {
            Context context = new InitialContext(props);
            System.out.println("Looking up HelloWorld");
            try {
                EJB3HelloWorld helloWorld = (EJB3HelloWorld)context.lookup("EJB3HelloWorldBean/remote");
                helloWorld.sayHello("Hello world");
            } catch (NamingException e) {
                System.out.println("couldnt look it up");
                e.printStackTrace();
            }
        } catch (NamingException e) {
            System.out.println("naming exception");
            e.printStackTrace();
        } 
    }
}

 8. start the jboss server
in the Servers tab at the bottom of eclipse, right click the JBoss 4.2 Server > start
wait for it to start up

9. run your code =)
right click somewhere in the EJB3HelloWorldClient.java file > run as > java application