How to run Hello World example in Eclipse with Glassfish v3 as appserver

[L. Wei]

Hi, I am reading "EJB3 In Action", and trying to run the Hello World example in the first chapter in Eclipse. I've correctly setup Glassfish v3 in Eclipse and I've created a server in the Servers console. I created a project and then copied 3 files of the chapter 1 example from the book website www.manning.com/panda

HelloUser.java

package ejb3inaction.example;
import javax.ejb.Remote;
@Remote
public interface HelloUser {
	public void sayHello(String name);
}

HelloUserBean.java

package ejb3inaction.example;
import javax.ejb.Stateless;
@Stateless                                                          
public class HelloUserBean implements HelloUser {                   
    public void sayHello(String name) {
        System.out.println("Hello " + name + " welcome to EJB 3 In Action!");
    }
}

HelloUserClient.java

package ejb3inaction.example;
import javax.ejb.EJB;
public class HelloUserClient {
	@EJB
	private static HelloUser helloUser;
	public static void main(String[] args) {
		helloUser.sayHello("Curious George");
		System.out.println("Invoked EJB successfully ... see server console for output");
	}
}

I deploy the ejb in Glassfish successfully, but when I running HelloUserClient, I got NullPointerException

Exception in thread "main" java.lang.NullPointerException
	at ejb3inaction.example.HelloUserClient.main(HelloUserClient.java:9)

I know it's because helloUser reference to null. However, is it supposed to be right for this example? or Did I miss anything else? or I can't just copy and paste the sample code into eclipse and run from there? (the book examples are run in command line). I have no clue. Please help. Thanks

[Christophe Verré]

How did you run the application ? The HelloUser will not be injected if you execute it outside the container. Try to use Glassfish's appclient instead (there's an example here).

[L. Wei]

Christophe Verré wrote:How did you run the application ? The HelloUser will not be injected if you execute it outside the container. Try to use Glassfish's appclient instead (there's an example here).

I deployed the ejb in glassfish (I thought it's in container), but I ran HelloUserClient.java as Java Application in Eclipse. I think it's wrong, but I dont know how to run HelloUserClient in Glassfish instead of Java application.

[Christophe Verré]

L. Wei wrote:I dont know how to run HelloUserClient in Glassfish instead of Java application.

Use Glassfish's appclient. Check the link in my previous post.

[André Asantos]

Does anybody have any exemple that use web interface?

[André Asantos]

L. Wei wrote:Hi, I am reading "EJB3 In Action", and trying to run the Hello World example in the first chapter in Eclipse. I've correctly setup Glassfish v3 in Eclipse and I've created a server in the Servers console. I created a project and then copied 3 files of the chapter 1 example from the book website www.manning.com/panda

HelloUser.java

package ejb3inaction.example;
import javax.ejb.Remote;
@Remote
public interface HelloUser {
	public void sayHello(String name);
}

HelloUserBean.java

package ejb3inaction.example;
import javax.ejb.Stateless;
@Stateless                                                          
public class HelloUserBean implements HelloUser {                   
    public void sayHello(String name) {
        System.out.println("Hello " + name + " welcome to EJB 3 In Action!");
    }
}

HelloUserClient.java

package ejb3inaction.example;
import javax.ejb.EJB;
public class HelloUserClient {
	@EJB
	private static HelloUser helloUser;
	public static void main(String[] args) {
		helloUser.sayHello("Curious George");
		System.out.println("Invoked EJB successfully ... see server console for output");
	}
}

I deploy the ejb in Glassfish successfully, but when I running HelloUserClient, I got NullPointerException

Exception in thread "main" java.lang.NullPointerException
	at ejb3inaction.example.HelloUserClient.main(HelloUserClient.java:9)

I know it's because helloUser reference to null. However, is it supposed to be right for this example? or Did I miss anything else? or I can't just copy and paste the sample code into eclipse and run from there? (the book examples are run in command line). I have no clue. Please help. Thanks

To skip out that code error try on:

package modelo;

import javax.ejb.EJB;

import appinterface.HelloUser;

public class HelloUserClient {  
	
    @EJB  
    private static HelloUser helloUser = new HelloUserBean();  
    
    public static void main(String[] args) {  
        helloUser.sayHello("Curious George");  
    }  
}

[Cong Yu]

the HelloUserClient is not a container managed component when you run it as a java application, so the @EJB annotation doesn't work here because DI is not enabled outside the container. Instead, you must use a JNDI lookup to retrieve the EJB.

here's the example code in the main method

InitialContext ic = new InitialContext();
HelloUser user = (HelloUser) ic.lookup("the JNDI name of the EJB");
user.sayHello("blabla");

[kurt hanni]

Include gf-client.jar in your classpath, then do the lookup code