How to call Ejb bean in same Jvm?

Question

i want to know from how many ways i can call my EJb bean without Jax-rs web service.I setup an EJB 3 interface/implementation looking like this...

UserService (interface)

package business;

public interface UserService {

    public String doSomething();

}

UserServiceBean (implementation)

@Stateless
@Local
public class UserServiceBean implements UserService{

    public UserServiceBean() {
    }

    @Override
    public String doSomething() {
        return "Work done!";
    }

}

What i know: I know by calling my web service i can get output : "Work done!" like this.

RestService (Web Service)

package webservices;

@Path("/service")
public class RestService {

    @Inject
    private UserService userService;

    public RestService() {
        // TODO Auto-generated constructor stub
    }

    @GET
    @Produces(MediaType.TEXT_HTML)
    @Path("/userService")
    public String getUserServiceResponse(String json){
        String response = userService.doSomething();
        return response;
    }

}

What I Want: I want a simple method/approach/shortcut etc you can say it. To call my EJB bean without any web service to get my expected output : "Work done!" .

As like we uses public static void main method in java application.It is very clear question which i have asked.Hope you all got it.

Your question's subject `How to call Ejb bean in same Jvm` contradicts your second last sentence `As like we uses public static void main method in java application` because you're either asking about a client that is executing in your server in the same JVM as your EJB, or a standalone EJB client (which runs in a different JVM), so your question is not clear at all. — Steve C, Nov 28 '16 at 08:03
Steve actually i donot know proper relationship how Ejb in same JVM. Can you explain me or else give me link to read it out. i only want to call my EJB bean class to get output. So can you tell me the way? — , Nov 28 '16 at 09:07
i want to call my Ejb from any class like Demo. Which can be in same folder as where Ejb is situated. — , Nov 28 '16 at 12:13
I think you are asking how to call `doSomething()` without using JAX-RS. There are lots of ways, but we don't know what you expect to be able to do. If you just want `doSomething()` to be called once at startup, you could annotate with `@PostConstruct`. If you want it triggered automatically with a timer, you could annotate with `@Schedule`. How do you want to use this method? — Mike, Nov 28 '16 at 13:59

score 0 · Accepted Answer · edited May 23 '17 at 12:07

If I understand your request properly you look for a way to call your EJB from outside the container from a java main class?

In that case you need to

get an JNDI context with the correct properties for your container
lookup a reference to the EJB within the container
execute the business method on it

Here's an example for the WildFly:

public static void main(String[] args) throws NamingException {
        Properties jndiProps = new Properties();
        jndiProps.put(Context.INITIAL_CONTEXT_FACTORY, "org.jboss.naming.remote.client.InitialContextFactory");
        jndiProps.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");
        jndiProps.put("jboss.naming.client.ejb.context", true);
        jndiProps.put(Context.PROVIDER_URL, "http-remoting://localhost:8080");
        jndiProps.put(Context.SECURITY_PRINCIPAL, "user");
        jndiProps.put(Context.SECURITY_CREDENTIALS, "xxx");
        Context ctx = new InitialContext(jndiProps);
        MyBeanRemote myBean = (MyBeanRemote) ctx.lookup("/<appname>/<beanname>!<fullqualifiedremoteinterface>");
        myBean.doSomething();
    }

Note the following:

You need to have a remote interface for your EJB
You may need to add an application user via script in WildFly's bin folder
You need to adapt the lookup string to your needs, you'll see it in WildFly logs during deployment (just leave out namespace prefix)

I included a full answer here for completeness, credits belong to user theisuru for my own question

How to call Ejb bean in same Jvm?

1 Answers1