001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      https://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.net.ftp;
019
020import java.io.IOException;
021
022/**
023 * FTPConnectionClosedException is used to indicate the premature or unexpected closing of an FTP connection resulting from a
024 * {@link org.apache.commons.net.ftp.FTPReply#SERVICE_NOT_AVAILABLE FTPReply.SERVICE_NOT_AVAILABLE} response (FTP reply code 421) to a failed FTP command. This
025 * exception is derived from IOException and therefore may be caught either as an IOException or specifically as an FTPConnectionClosedException.
026 *
027 * @see FTP
028 * @see FTPClient
029 */
030public class FTPConnectionClosedException extends IOException {
031
032    private static final long serialVersionUID = 3500547241659379952L;
033
034    /** Constructs a FTPConnectionClosedException with no message */
035    public FTPConnectionClosedException() {
036    }
037
038    /**
039     * Constructs a FTPConnectionClosedException with a specified message.
040     *
041     * @param message The message explaining the reason for the exception.
042     */
043    public FTPConnectionClosedException(final String message) {
044        super(message);
045    }
046
047}