Mockito - ClassCastException when using Collection

Question

I have a puzzling problem when mocking a class with a method that gets a collection as an argument.

public class Foo {
    public Foo () { }

    public boolean doSomething(List<Bar> bars) {
        return true;
    }
}

public class Bar {
    public Bar() {}
}

When trying to create a mock

Foo foo = mock(Foo.class);

I get:

Mockito can only mock visible & non-final classes.
If you are not sure...

Underlying exception : java.lang.IllegalArgumentException: java.lang.ClassCastExcception@1ba9917e
...

Sorry for the short error description, I had to copy by hand from offline terminal.

When I change the argument of the doSomething() method to just doSomething(Bar bar) it succeeds in creating the mock.

One final weird thing, it doesn't reproduce on other workstations.

Well, do is a keyword in Java (do while loop). I wouldn't be surprised if naming method with a keyword would cause some weird errors. — Mateusz Kubuszok
– Mateusz Kubuszok, Commented Feb 28, 2016 at 10:56
My mistake, @peter, I meant to write some generic function name. I typed directly without compiler because I can't paste the code..updated — Sagi
– Sagi, Commented Feb 28, 2016 at 12:51
"Mockito can only mock visible & non-final classes" that's the problem (in your "real" code). — user180100
– user180100, Commented Feb 28, 2016 at 15:24

Sagi · Accepted Answer · 2016-03-10 09:07:38Z

1

After much trial and error, the only difference between the machines was the JDK version. On the machine where it wasn't working we had 1.8.0_05. Updating to 1.8.0_45 fixed it.

answered Mar 10, 2016 at 9:07

Sagi

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