Why mockito returning me MockitoException while I'm expecting ClassNotFoundException?

[LOH KOK HOE]

Assume I have a class that throw ClassNotFoundException like this:

public class RealOne {

   public void funcA() {

      try {

         ...

      }

      catch( ClassNotFoundException e ) {}

   }

}

When I unit test this method like this: 

@Test(expected=ClassNotFoundException.class)

public void testingClassNotFoundException() {

   stubber.funcA();

}

I get following error:

java.lang.Exception: Unexpected exception, expected<java.lang.ClassNotFoundException> but was<org.mockito.exceptions.base.MockitoException>

...

...

Caused by: org.mockito.exceptions.base.MockitoException: 

Checked exception is invalid for this method!

Invalid: java.lang.ClassNotFoundException

May I know how could I expect ClassNotFoundException but not MockitoException?

[Johan Haleby]

Does your code throw a ClassNotFoundException? It doesn't look like it in your example.

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[LOH KOK HOE]

I'm sure ClassNotFoundException will be throw because I have this code:

PowerMockito.doThrow(new ClassNotFoundException())

.when(this.stubber, PowerMockito.method(RealOne.class, "funcA"))

.withNoArguments();

[LOH KOK HOE]

I just found something interesting, if I doThrow(new HibernateException("")), it is OK. If I doThrow(new ClassNotFoundException()), there is an exception occur in the PowerMockito. I think I have accidentally trigger a Mockito bug. Can someone please verify whether I can mock ClassNotFoundException being thrown?

[Johan Haleby]

ClassNotFoundException is a checked exception so you need to declare it on the method.

/Johan

[LOH KOK HOE]

You mention declare, do you mean this?

import java.lang.ClassNotFoundException;

I have already done that but still failed.

[Johan Haleby]

You need to declare it on the method.

/Johan

[LOH KOK HOE]

May I know how could I declare it on method? Any sample?

[Matt Lachman]

Java 101:

public void foo() throws Exception

Where Exception is whatever type thrown that does not inherit from RuntimeException.

On Jan 7, 2014, at 7:58 PM, LOH KOK HOE <huah...@gmail.com> wrote:

May I know how could I declare it on method? Any sample?

[LOH KOK HOE]

ic, that one is actually called declare on method. Got you.

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[Sean Kelly]

I thought I was having the same problem, but now I understand thanks to the explanation above. Here's a bit more... if you have:

public class RealOne {

   public void funcA() {

      try {

         someOtherMethod();

      }

      catch( ClassNotFoundException e ) {}

   }

  private void someOtherMethod() throws ClassNotFoundException {
    throw new ClassNotFoundException();
  }

}

When you mock, you can't say that funcA throws ClassNotFoundException() because it doesn't. someOtherMethod() throws that exception, so you have to mock like:

doThrow(new ClassNotFoundException()).when(realOneSpyInstance).someOtherMethod();

funcA doesn't throw the exception, therefore you can't tell mockito to throw that exception from funcA - funcA just *catches* it.

HTH...
- SK

[LOH KOK HOE]

Nice one ;)

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