JSch断开连接并重新打开通道导致异常通道未打开

Question

所以我使用Jsch在远程服务器上运行多个命令。目前我打开一个会话，每当我需要运行远程命令时，我打开新的exec通道，执行命令，并断开连接。

然而，我经常遇到异常（虽然并非总是如此）。我想知道造成这种异常的原因。是因为我断开连接太快了吗？或者我应该重新使用exec频道而不是每次都创建新频道？

channel = session.openChannel("exec");
((ChannelExec)channel).setCommand(command);

/// some code goes here ///

channel.connect(); // <---- No Exception here

while (true) {
    if (channel.isClosed()) {
        exitCode = channel.getExitStatus();
        LOGGER.info("Exit code = " + exitCode);

        if (exitCode != 0) {
            throw new IOException("Command failed with code " + exitCode + " error = " + getError());
        }
        break;
    }
    Thread.sleep(1000);
}

channel.disconnect();

//// some code goes here ////

channel = session.openChannel("exec");
((ChannelExec)channel).setCommand(command);

/// some code goes here ///

channel.connect(); // <---- Sometimes exception here (JschException: channel is not opened)

异常追踪：

if(this.getRecipient()==-1){  // timeout
  throw new JSchException("channel is not opened.");
}

非常感谢任何帮助！