Enterprise JavaBeans 3.0 Simplified API Quiz

1. How many Local business interfaces can one EJB 3.0 Session bean have?

2. Given a Session bean class with the following annotations:

private @EJB(name="fooejbref") Foo foo;
private @Resource SessionContext sessionCtx;

Which of the following could be used to retrieve the ejb dependency declared above?

3. Which are valid declarations for a Local business interface?

public interface Foo1 {
  public void foo();
}

import javax.ejb.Local;
@Local
public interface Foo2 {
  public void foo();
}

import javax.ejb.*;
@Local
public interface Foo3 extends EJBLocalObject {
  public void foo();
}

import javax.ejb.*;
@Local
@Remote
public interface Foo4 {
  public void foo();
}

4. An interceptor class may contain:

5. Given the following @EJB declarations:

@EJB(beanName="foo") Foo ref1;
@EJB(beanName="foo") Foo ref2;

@EJB(beanName="bar") Bar ref3;
@EJB(beanName="bar") Bar ref4;

Where ejb "foo" is a Stateful Session bean with Local business interface Foo and ejb "bar" is a Stateless Session bean with Local business interface Bar

After injection has completed, what would be the output of the following code?

System.out.println(ref1.equals(ref2));
System.out.println(ref3.equals(ref4));

6. Which is a valid declaration of a PostConstruct method in a Session bean class?

public  @PostConstruct void postConstruct1() {}
private @PostConstruct void postConstruct2() {}

7. Given the following Message Driven Bean declaration:

@MessageDriven
public class FooMsgBean implements javax.jms.MessageListener {
  public void onMessage(Message m) { ... }
}

Assuming it is deployed without an ejb-jar.xml, which best describes the transactional nature of the onMessage method ?

8. Given the following Remote business interface:

@Remote 
public interface Hello {
  public String hello();
}

Which exceptions can be received by the caller as a result of invoking the hello() method?

9. In a Stateful Session bean, dependency injection takes place:

10. Which of the following results in the removal of an EJB 3.0 Stateful Session bean?