if (masterDegreeThesisDataVersion.getCurrentState().equals(State.ACTIVE)
if (masterDegreeThesisDataVersion.getCurrentState().getState().equals(State.ACTIVE)
    public static MasterDegreeThesisDataVersion readActiveByDissertationTitle(String dissertationTitle) {        for (MasterDegreeThesisDataVersion masterDegreeThesisDataVersion : RootDomainObject                .getInstance().getMasterDegreeThesisDataVersions()) {            if (masterDegreeThesisDataVersion.getCurrentState().equals(State.ACTIVE)                    && masterDegreeThesisDataVersion.getDissertationTitle().equals(dissertationTitle)) {                return masterDegreeThesisDataVersion;            }        }        return null;    }