java ee lookup ejbs from from different app - rest

Question

Java EE Tutorial is not helpful at all. Internet search was underwhelming.
I have an EJB module that is deployed to glassfish by itself. It has #Local and #Remote annotated iterfaces which are both implemented by the concrete class.
Then i have a REST resource that needs to get a reference to that ejb module and invoke some methods.
Can you give me a barebones, simple example of how that is done? I mean, i can't even inject SessionContext into my rest app, as it crashes... Please, keep it simple.
The ejb should just have a:
public String getMsg(){
return "ohai";
}
The rest service:
#GET
#Produces("text/plain")
public String asd(){
return <the myterious ejb that was injected somehow>.getMsg();
}
Thanks.

Answer 1

Alright, i figured it out. Using NetBeans, but probably applicable to Eclipse. Server - glassfish
Create webapp, an EJB -> call EJB from webapp. All these run inside the same server as separate modules.
First: create an EJB module, it will be deployed on its own:
remote interface:
package main;
import javax.ejb.Remote;
#Remote
public interface YourRemoteInterface{
public String tellMeSomething();
public void otherMethod(); //etc...
}
then create the EJB implementation class:
concrete implementation
package main;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.ejb.EJB; //crucial to JNDI lookup
#Remote(RemoteInterface.class)
#Stateless
#EJB(name="java:global:/MYSTUFF", beanInterface=YourRemoteInterface.class)
public class YourConcreteClass implements YourRemoteInterface{
#Override
public String tellMeSomething(){//...} //and do the other methods
}
#EJB name attribute names your bean, that you will use to look it up. Can by any name. For ex: "some-name", or "java:global/YourConcreteClass"
Part two - webapp:
For web app i used a rest service, but surely can be another EJB or a SE client app. For SE client you'd need to set connection info, but that for another life.
#Path("/somePath")
public class Service{
#GET
#Produces("text/plain")
public String qwe(){
try{
javax.naming.InitialCOntext ic = new javax.naming.InitialContext();
YourRemoteInterface rb = (YourRemoteInterface)ic.lookup("java:global:/MYSTUFF");
return rb.tellMeSomething();
} catch (Exception ex) {
return "F*uck your life";
}
}
}
Now, from Project Properties of your webapp, you need to:
1) add the ejb jar file to Libraries so it shows in the Compile tab. I used the "Add project" button
2) Build -> Packaging: add the ejb jar file to WAR content. I used "Add file/folder", where i navigated to NetBeans projects / the EJB module / build / dist
note: you may experience an error when trying to deploy the ejb, or redeploy it. Error name is: java.lang.RuntimeException: Error while binding JNDI name main.RemoteInterface#main.RemoteInterface for EJB RemoteBean . Skipping the vague explanation, to cure it, you need to execute a command in glassfish:
asadmin set server.ejb-container.property.disable-nonportable-jndi-names="true"
Now, you can compile the webapp and deploy it. Should work.
At the end it's that simple. I swear i've eaten the WHOLE ejb section in glassfish tutorial and nowhere do they tell you this stuff. It's so annoying.