commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

⏎ org/apache/commons/net/ftp/FTPConnectionClosedException.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.net.ftp;
import java.io.IOException;

/**
 * FTPConnectionClosedException is used to indicate the premature or
 * unexpected closing of an FTP connection resulting from a
 * {@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 exception is derived from IOException and
 * therefore may be caught either as an IOException or specifically as an
 * FTPConnectionClosedException.
 *
 * @see FTP
 * @see FTPClient
 */

public class FTPConnectionClosedException extends IOException
{

    private static final long serialVersionUID = 3500547241659379952L;

    /** Constructs a FTPConnectionClosedException with no message */
    public FTPConnectionClosedException()
    {
    }

    /**
     * Constructs a FTPConnectionClosedException with a specified message.
     *
     * @param message  The message explaining the reason for the exception.
     */
    public FTPConnectionClosedException(final String message)
    {
        super(message);
    }

}

⏎ org/apache/commons/net/ftp/FTPConnectionClosedException.java

Or download all of them as a single archive file:

File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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