JSch多个通道相同的会话

Question

我正试图通过单jSCH session打开多个频道 这是我的代码。

public class PoolTest {

    private static Hashtable<String, Session> pool = new Hashtable<>();
    /**
     * @param args
     * @throws InterruptedException 
     * @throws IOException 
     * @throws JSchException 
     */
    public static void main(String[] args) throws JSchException, IOException, InterruptedException {
        PoolTest test = new PoolTest();
        test.runCommand("show system");
        test.runCommand("show version");
    }

    private void runCommand(String command) throws JSchException, IOException, InterruptedException{
        Session session = createNewSession();
        System.out.println(session.isConnected());
        Channel channel = session.openChannel("shell");
        ((ChannelShell) channel).setPtyType("dumb");
        channel.connect();
        OutputStream ops = channel.getOutputStream();
        PrintStream ps = new PrintStream(ops, true);

        channel.connect();
        ps.println(command); 

        ps.close();

        InputStream in=channel.getInputStream();
        byte[] bt=new byte[1024];


        while(true)
        {

            while(in.available()>0)
            {
                int i=in.read(bt, 0, 1024);
                if(i<0)
                    break;
                String str=new String(bt, 0, i);
                //displays the output of the command executed.
                System.out.print(str);


            }
            if(channel.isClosed())
            {

                break;
            }
            Thread.sleep(1000);
            channel.disconnect();
        }
        channel.disconnect();
    }
    private Session createNewSession() throws JSchException{
        if(pool.get("10.94.101.235")==null){
        System.out.println("creating new session");
        JSch jsch = new JSch();
        Session session;
        session = jsch.getSession("unknown", "10.94.101.235", 22);
        session.setPassword("wont_tell");
        session.setConfig("StrictHostKeyChecking", "no");
        session.setTimeout(60000);
        session.connect();
        pool.put("10.94.101.235", session);
        return session;
        }
        else 
            return pool.get("10.94.101.235");
    }
}

正如所料，第一个命令提供了适当的数据。但是，第二个命令对isConnected调用显示为false。

  

线程中的异常＆＃34; main＆＃34; com.jcraft.jsch.JSchException：会话已关闭           在com.jcraft.jsch.Session.openChannel（Session.java:844）           在com.dell.supportassist.collector.test.PoolTest.runCommand（PoolTest.java:40）           在com.dell.supportassist.collector.test.PoolTest.main（PoolTest.java:34）

关于为什么会话断开连接的任何想法？