Is inheritance allowed for EJB3 Stateless Session Beans?

Question

Suppose I have a stateless bean:

@Stateless(name = "fooBean")
@LocalBean
public class Foo {
...
}

I want to create a mock for testing (with CDI)

@Alternative @Specializes
public class FooMock extends Foo {
...
}

I register the mock in beans.xml, and when I run it with OpenEJB, I get the following exception:

...
Caused by: javax.naming.NameAlreadyBoundException:
openejb/Deployment/fooBean/com.company.Foo!LocalBeanHome

It seems to me that the container creates an interface for Foo because of @LocalBean which is now implemented by FooMock, too. OpenEJB tries to bind the two classes with the with same name of same generated interface, which is not possible.

Of course, if I comment out @Stateless and @LocalBean in Foo class, it works fine.

Any idea or suggestion to solve this?

Answer 1

Rather do something like:

@Local
public interface Foo {
...
}

@Stateless
public class FooBean implements Foo {
...
}

Then make your mock.

@Alternative
@Specializes
public class FooMock implements Foo {
...
}

However I recommend you take a look at Arquillian it will make your testing so much easier without the need for @Alternative and special beans.xml entries for tests.