hibernate/src/java/org/apache/fulcrum/security/hibernate/turbine/HibernateModelManagerImpl.java [74:114]:
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                return;
            }
        }
        catch (Exception e)
        {
            throw new DataBackendException("grant(Role,Permission) failed", e);
        }
        if (!roleExists)
        {
            throw new UnknownEntityException("Unknown role '" + role.getName() + "'");
        }
        if (!permissionExists)
        {
            throw new UnknownEntityException("Unknown permission '" + permission.getName() + "'");
        }
    }

    /**
     * Revokes a Permission from a Role.
     * 
     * @param role
     *            the Role.
     * @param permission
     *            the Permission.
     * @throws DataBackendException
     *             if there was an error accessing the data backend.
     * @throws UnknownEntityException
     *             if role or permission is not present.
     */
    public synchronized void revoke(Role role, Permission permission) throws DataBackendException, UnknownEntityException
    {
        boolean roleExists = false;
        boolean permissionExists = false;
        try
        {
            roleExists = getRoleManager().checkExists(role);
            permissionExists = getPermissionManager().checkExists(permission);
            if (roleExists && permissionExists)
            {
                ((TurbineRole) role).removePermission(permission);
                ((TurbinePermission) permission).removeRole(role);
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memory/src/java/org/apache/fulcrum/security/memory/turbine/MemoryTurbineModelManagerImpl.java [69:110]:
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                return;
            }
        }
        catch (Exception e)
        {
            throw new DataBackendException("grant(Role,Permission) failed", e);
        }

        if (!roleExists)
        {
            throw new UnknownEntityException("Unknown role '" + role.getName() + "'");
        }
        if (!permissionExists)
        {
            throw new UnknownEntityException("Unknown permission '" + permission.getName() + "'");
        }
    }

    /**
     * Revokes a Permission from a Role.
     * 
     * @param role
     *            the Role.
     * @param permission
     *            the Permission.
     * @throws DataBackendException
     *             if there was an error accessing the data backend.
     * @throws UnknownEntityException
     *             if role or permission is not present.
     */
    public synchronized void revoke(Role role, Permission permission) throws DataBackendException, UnknownEntityException
    {
        boolean roleExists = false;
        boolean permissionExists = false;
        try
        {
            roleExists = getRoleManager().checkExists(role);
            permissionExists = getPermissionManager().checkExists(permission);
            if (roleExists && permissionExists)
            {
                ((TurbineRole) role).removePermission(permission);
                ((TurbinePermission) permission).removeRole(role);
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