Use OpenEJB for Junit Test

I was struggling yesterday to find a way to do Junit test for EJB and I found OpenEJB. But  the configuration gave me errors. So I thought to write a complete example because I couldn't find it anywhere.

First lets create a simple ejb.

Here is the interface

  package com.imesh.testejb;

  import javax.ejb.Local;

  @Local

  public interface IHello {

    public string sayHi();

  }

OK now the bean class.

 

  package com.imesh.testejb;

 

  import javax.ejb.Stateless;

  /**

   * Session Bean implementation class Hello

   */

  @Stateless

  public class HelloBean implements IHello{

    /**

     * Default constructor.

     */

    public HelloBean() {

    }

    @Override

    public string sayHi() {

      return "HI";

    }

  }

Write our unit test class.

package com.imesh.test.ejbtest;

import static org.junit.Assert.*;

import java.util.Properties;

import javax.ejb.EJB;

import javax.naming.InitialContext;

import org.apache.openejb.api.LocalClient;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

@LocalClient

public class HelloBeanTest {

 @Before

 public void setUp() throws Exception {

     Properties properties = new Properties();
     properties.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.LocalInitialContextFactory");
     properties.setProperty("openejb.deployments.classpath.include", ".*");
     initialContext = new InitialContext(properties);

 }

 @After

 public void tearDown() throws Exception {

 }

 @Test

 public void testSayHi() {

   bean = (IHello) initialContext.lookup("HelloBeanLocal");

   assertEquals("Hi", bean.sayHi());

  

 }

  private InitialContext initialContext;

 private IHello bean ;

}

Ok now we need ejb-jar.xml file which should be located in the META-INF folder.

ejb-jar.xml contains nothing but   just empty tag. I couldn't run the unit test without this xml but nobody mentioned about this xml in examples. The error I got is relate to the JNDI name not found.

If you do use annotation in your ejb class, ejb-jar.xml will overwrite your annotation. So you can add this xml to test > resources > META-INF folder because we need this only for unit test. 

Next is dependencies. You may not want slf4j dependency. But I had some errors without it.


            org.apache.openejb
            openejb-core
            3.1.3
            test
       
       
            org.slf4j
            slf4j-nop
            1.6.1

 That's it. We are done. you can compile and run the unit test.