| [aspectj-users] Testing with AspectJ question |
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Hi all I tried to test my classes in Web tier of J2EE application and got some kind of problem.
For example, in some class (Helper) I have a method that connects to EJB tier with Delegate class (using Business Delegate pattern)
public class Helper.... {
public void someMethod() { try { Delegate delegate = new Delegate(); // using delegate to invoke business methods of EJB // .....
} catch( DelegateException e) { // exception in delegate //.... } } ..................... }
Here is the Delegate class
public class Delegate { public Delegate() throws DelegateException { try { // getting home interface of ejb using JNDI and storing in local variable //..... } catch(EJBException e) { throw new DelegateException() } .... } // ... business methods delegating to the actual enterprise bean // ... }
To test Helper class (out-of-container testing) I try to isolate it from any problems that can arise in Delegate class (with JNDI and EJBs for example) So I wrote MockDelegate class that extends Delegate public class MockDelegate extends Delegate { public MockDelegate() throws DelegateException { } // my stubs for all needed business methods // ... }
Then I tried to use AspectJ to replace the creating of Delegate in Helper (with around advice)
Delegate delegate = new Delegate(); with Delegate delegate = new MockDelegate();
But this was silly because the default constructor of Delegate in any case is executed when MockDelegate object is created And I get DelegateException from Delegate constructor because of JNDI and EJB dependency what I tried to avoid. I don't know can I replace the body of constructor of Delegate class to do nothing (and how?) Or can I replace the line Delegate delegate = new Delegate(); With MockDelegate delegate = new MockDelegate() ?
(I may refactor Helper class but I may not refactor Delegate class.)
Can you give me any advice what is the best way to do this? Any help will be much appreciated!
Thanks Leonid Visochin E-mail: LVissochin@xxxxxxxxxxxxx
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