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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.net.ftp;
19  
20  import java.io.IOException;
21  
22  /**
23   * FTPConnectionClosedException is used to indicate the premature or unexpected closing of an FTP connection resulting from a
24   * {@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
25   * exception is derived from IOException and therefore may be caught either as an IOException or specifically as an FTPConnectionClosedException.
26   *
27   * @see FTP
28   * @see FTPClient
29   */
30  
31  public class FTPConnectionClosedException extends IOException {
32  
33      private static final long serialVersionUID = 3500547241659379952L;
34  
35      /** Constructs a FTPConnectionClosedException with no message */
36      public FTPConnectionClosedException() {
37      }
38  
39      /**
40       * Constructs a FTPConnectionClosedException with a specified message.
41       *
42       * @param message The message explaining the reason for the exception.
43       */
44      public FTPConnectionClosedException(final String message) {
45          super(message);
46      }
47  
48  }