Trying SSH CLI , reading command line method is infinte loop problem!

Question

I am trying excute command and reading result. but reading result part has problem.
below source is a part of my method.
try{
               SessionChannelClient sessionChannel = ssh.openSessionChannel();
               sessionChannel.startShell();
               OutputStream out = sessionChannel.getOutputStream();
               String cmd = s + "\n";
               out.write(cmd.getBytes());
               out.flush();
               InputStream in = sessionChannel.getInputStream();
               BufferedReader br = new BufferedReader(new InputStreamReader(in));
               byte buffer[] = new byte[255];
               String read= "";
               while (true) {
                    String line = br.readLine();
                    if (line == null)
                         break;
                    str += line;
                    str += "\n";
               System.out.print(str); //print result
               sessionChannel.close();
               in.close();
               out.close();
          }catch(IOException ee){
               System.out.println(ee);
          }finally{
               System.out.println("=============end cmd=============");
while loop has problem. While statement has infinite loop problem.
why has this problem?
anybody, help me please. Thanks for reading .
Edited by: BreathAir on Aug 5, 2008 12:16 AM

Answer 1

That loop will loop until readLine() returns null, which will only happen when the other end closes its end of the connection, and it will block while no data is available.