GroupManger Stupidity

Concurrency1.java

    public UserData getUser(UUID userId) {

        if (getUsers().containsKey(userId)) {
            return getUsers().get(userId);
        }

        // No user account found so create a new one.
        UserData newUser = createUser(userId);

        return newUser;
    }
    
    public UserData createUser(UUID userId) {

        if (getUsers().containsKey(userId)) {
            return null;
        }
        UserData newUser = new UserData(this, GroupManager.getInstance().getUserManager().getUser(userId));
        newUser.setGroup(groups.getDefaultGroup(), false);
        addUser(newUser);
        setUsersChanged(true);
        return newUser;
    }