JaCoCo integration with gwtmockito

Question

I am using JaCoCo maven plugin for the test coverage reports. It works with MockitoJUnitRunner, but when I use it with tests that run with GwtMockitoTestRunner (annotated @RunWith(GwtMockitoTestRunner.class)) I always get zero coverage. In the gwtmockito project documentation there is a JaCoCo support in the version 1.1.5 so I would expect it to work. Can you explain why it doesn't? Is there a way to make it work with JaCoCo, or are there some other tools that can measure code coverage of gwtmockito tests?