private MockThreadData threadLocalMockData() {
      try {
        return threadData.get();
      } catch (MockitoException ex) {
        throw cannotCreateMockException(getType(), ex);
      }
    }
Resolves the inline mock maker of Mockito, via different ways, depending on the Mockito version.

@return The inline mock maker of Mockito
spock-core/src/main/java/org/spockframework/mock/runtime/mockito/MockitoMockMakerImpl.java