hibernate/src/java/org/apache/fulcrum/security/hibernate/basic/HibernateModelManagerImpl.java [89:124]:
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        if (!groupExists)
        {
            throw new UnknownEntityException("Unknown group '" + group.getName() + "'");
        }
        if (!userExists)
        {
            throw new UnknownEntityException("Unknown user '" + user.getName() + "'");
        }
    }

    /**
     * Removes a user in a group.
     * 
     * This method is used when removing a user to a group
     * 
     * @param user
     *            the User.
     * @throws DataBackendException
     *             if there was an error accessing the data backend.
     * @throws UnknownEntityException
     *             if the user or group is not present.
     */
    public synchronized void revoke(User user, Group group) throws DataBackendException, UnknownEntityException
    {
        boolean groupExists = false;
        boolean userExists = false;
        Transaction transaction = null;

        try
        {
            groupExists = getGroupManager().checkExists(group);
            userExists = getUserManager().checkExists(user);
            if (groupExists && userExists)
            {
                Session session = getPersistenceHelper().retrieveSession();
                transaction = session.beginTransaction();
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hibernate/src/java/org/apache/fulcrum/security/hibernate/dynamic/HibernateModelManagerImpl.java [207:242]:
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        if (!groupExists)
        {
            throw new UnknownEntityException("Unknown group '" + group.getName() + "'");
        }
        if (!userExists)
        {
            throw new UnknownEntityException("Unknown user '" + user.getName() + "'");
        }
    }

    /**
     * Removes a user in a group.
     * 
     * This method is used when removing a user to a group
     * 
     * @param user
     *            the User.
     * @throws DataBackendException
     *             if there was an error accessing the data backend.
     * @throws UnknownEntityException
     *             if the user or group is not present.
     */
    public synchronized void revoke(User user, Group group) throws DataBackendException, UnknownEntityException
    {
        boolean groupExists = false;
        boolean userExists = false;
        Transaction transaction = null;

        try
        {
            groupExists = getGroupManager().checkExists(group);
            userExists = getUserManager().checkExists(user);
            if (groupExists && userExists)
            {
                Session session = getPersistenceHelper().retrieveSession();
                transaction = session.beginTransaction();
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