Question

I’m trying to test my Session Beans with JUnit, but I can’t. I’ve tried a lot of method, but still get some exceptions.
Here is what I need:

• I have a few Stateless Session Beans I need to test. Each has the same @PersistenceContext and uses an EntityManager
• With my test cases I need to test their methods. For instance: if I add an user with username X and then I try to add another one with the same username, I want to catch an Exception.

Can someone provide a simple and short generic test example? I’ve already read many, but I always get an error (I get NullPointerException for the EntityManager when I call a method like: sessionBean.method() (which does, for instance, entityManager.find(...)), or I am not able to initialize the Context, or other PersistenceException).

Answer 1

I solved creating a Stateless Session Bean and injecting its Entity Manager to test classes. I post the code in case someone will need it:

@Stateless(name = "TestProxy")
@Remote({TestProxyRemote.class})
public class TestProxy implements TestProxyRemote {

    @PersistenceContext(unitName = "mph")
    private EntityManager em;

    @Override
    public void persist(Object o) {
        em.persist(o);
    }

    @Override
    public void clear() {
        em.clear();
    }

    @Override
    public void merge(Object o) {
        em.merge(o);
    }

    @Override
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public Object find(Class classe, String key) {
        return em.find(classe, key);
    }

    @Override
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public Object find(Class classe, long key) {
        return em.find(classe, key);
    }

    @SuppressWarnings("rawtypes")
    @Override
    public List getEntityList(String query) {
        Query q = em.createQuery(query);
        return q.getResultList();
    }

}



public class MyTest {

    @BeforeClass
    public static void setUpBeforeClass() throws NamingException {
        Properties env = new Properties();
        env.setProperty(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
        env.setProperty(Context.PROVIDER_URL, "localhost:1099");
        env.setProperty("java.naming.factory.url.pkgs","org.jboss.naming:org.jnp.interfaces");
        jndiContext = new InitialContext(env);
        try {
            proxy = (TestProxyRemote) jndiContext.lookup("TestProxy/remote");
        } catch (NamingException e) {
            e.printStackTrace();
        }
    }
}

Then I can use proxy.find() to get the entities I need, o proxy.getEntityList() to execute a query to retrieve all the instance of an Entity. Or I can add other methods if I want.