IllegalAccessError when using GwtMockitoTestRunner

[tazle]

We tried to update to the latest gwtmockito (1.1.9), and after solving the missing parent module issue by publishing it ourselves to out private Maven repo, we ran into IllegalAccessErrors in tests run with GwtMockitoTestRunner.

Please see the reproduction here: https://github.com/tazle/gwtmockito/tree/illegalaccess-repro

The issue seems to be related to javassist version. Downgrading to 1.1.8 and javassist 3.22.0-GA makes the test pass. Staying with 1.1.8 gwtmockito and just upgrading javassist to 3.23.0-GA or 3.25.0-GA makes it fail.