[Rmock-developer] Fwd: ClassCastException: Why is it occurring?

[Joakim O. <joa...@ag...>]

---------- Forwarded message ----------
From: Joakim Ohlrogge <joa...@ag...>
Date: Jan 30, 2007 9:40 PM
Subject: Re: [Rmock-developer] ClassCastException: Why is it occurring?
To: Michael Nyika <ny...@ya...>


It took me a little while to spot the problem:


Here you are saying:

>
> ctx.getEntityManager();

* expect that ctx.getEntityManager() is called
  - once
  - return null (or if EntityManager is an interface, a mocked entity manager)

> modify().returnValue(is.instanceOf(EntityManager.class));

Here you are changing the recorded expectation to return an instance
of  InstanceOfConstraint primed with EntityManager.class. This gives a
class cast exception since what you should be returning is an instance
of an EntityManager.

What you want to do here to fix it is:

EntityManager entityManager = new EntityManager(); // or a mock if you prefer
modify().returnValue(entityManager);

I hope this helps some.
Regards Joakim Ohlrogge