In our case, it is clear that the issue seems to come from jacoco/emma conflict. Since I disabled Jacoco, a lot of things are back to work, and the test Denis made on JSF that disabled emma and kept jacoco was fine too.Any chance the stacktrace/context reveals which class is the problem and we could attach the related .class file to https://sourceforge.net/apps/trac/eclemma/ticket/196 as tried in https://sourceforge.net/projects/eclemma/forums/forum/614869/topic/5163999 ?