I generated the new Famix Java. There is one error in ScopingEntity : @FameProperty(name = "globalVariables", opposite = "parentModule", derived = true) public Collection<GlobalVariable> getGlobalVariables() { if (globalVariables == null) { globalVariables = new MultivalueSet<GlobalVariable>() { @Override protected void clearOpposite(GlobalVariable e) { e.setParentModule(null); } @Override protected void setOpposite(GlobalVariable e) { e.setParentModule(ScopingEntity.this); here ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ setParentModule wants a Module and not a Scope } }; } return globalVariables; }