my first ejb program and finding it hard to run ?

[gurpeet singh]

hi,
i'm trying to run a simple hello world kind of ejb program in eclipse. here is what i did.

i created a new enterprise application project. after that there was an option of NEW MODULE . i clicked on it and it gave me option of creating default module. i created application client module and ejb module.

IN EJB MODULE:

i have a POJI and a POJO which is a stateless bean as given below :

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


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!");
    }
}

in the application client module i have :

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");     
        }
}

so in project explorer i have an enterprise application project with 2 modules viz. ejb module and client module. i right clicked enterprise project and clicked run on server. then i exported the application client module project as export > application client jar file. i placed the jar file in the location of appclient binary of glassfish. i invoked appclient - client Testclient.jar and it gave me error that it cannot find class HelloUser.

i have included ejb moduel project in build path of application module. Please help ?

if i dont create enterprise application project but just create ejb project and put all 3 files in the single project then it runs fine.

please help

thanks and regards

[Frits Walraven]

Hi Gurpeet,

Trying to access an EJB from a Java SE project or the ACC (Application Client Container) is always a bit tricky as you need to configure some things manually. The best way is to test from a Servlet, as you are now quite familiar with Servlets. Injection of an EJB in a Servlet doesn't need any extra configuration.

Did you read the Oracle ACC article?

You can also try if the lookup from the JNDI (replace ApplicationClientContainerTest with your ear-project name and ApplicationClientContainerTestEJB with your EJB-project name) works:

import javax.ejb.EJB;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import ejb3inaction.example.HelloUser;


public class Main {
	@EJB  
    private static HelloUser helloUser;  
	public static void main(String[] args) throws NamingException {		
		if (helloUser==null){
			System.out.println("Injection failed, going to do a lookup...");
			helloUser = lookup();
		}
		helloUser.sayHello("Curious George");  
        System.out.println("Invoked EJB successfully .. see server console for output");
	}

	private static HelloUser lookup() throws NamingException {
		InitialContext context = new InitialContext();
		HelloUser helloBean = (HelloUser)context.lookup("java:global/ApplicationClientContainerTest/ApplicationClientContainerTestEJB/HelloUserBean");
		return helloBean;
	}

	/* (non-Java-doc)
	 * @see java.lang.Object#Object()
	 */
	public Main() {
		super();
	}

}

Regards,
Frits