How to interact with the script after its execution using Jsch - jsch

Question

Scenario:
1.I am able to execute a bash script on remote ssh server successfully.
2.The script wants the user to enter some input's to proceed.
The Program hangs after the script is executed.
Q:1 Is this possible using JSCH or any other java based libraries?
Q:2 Which is the best library in java to handle such scenario?
Below is my piece of code :
public class SshMultiCommands
{
public void execute(String u,String h,String p) throws Exception
{
JSch jsch = new JSch();
String user = u;
String host = h;
String passwd = p;
int port = 22;
Session session = jsch.getSession(user, host, port);
session.setPassword(passwd);
session.setConfig("StrictHostKeyChecking", "no");
session.connect();
Channel channel = session.openChannel("shell");
OutputStream ops = channel.getOutputStream();
channel.setOutputStream(ops,true);
((ChannelShell)channel).setPtyType("vt102");
((ChannelShell)channel).setEnv("LANG", "ja_JP.eucJP");
PrintStream ps = new PrintStream(channel.getOutputStream());
channel.connect();
Thread.sleep(1000);
InputStream input = channel.getInputStream();
//commands
ps.println("ls -l");
ps.println("bash /opt/dla.sh");
ps.println("3"); // The sample user Input to script.This is getting printed but is not getting executed
printResult(input, channel);
ps.close();
channel.disconnect();
session.disconnect();
//System.out.println("OT Session Completed");
}
private static void printResult(InputStream input,
Channel channel) throws Exception
{
int SIZE = 1024;
byte[] tmp = new byte[SIZE];
while (true)
{
while (input.available() > 0)
{
int i = input.read(tmp, 0, SIZE);
if(i < 0)
break;
System.out.print(new String(tmp, 0, i));
}
if(channel.isClosed())
{
System.out.println("exit-status: " + channel.getExitStatus());
break;
}
try
{
Thread.sleep(300);
}
catch (Exception ee)
{
}
}
}
}

Answer 1

Solution: Put sleep of 5-10 sec after you run the script or program. And keep flushing the output stream after every command. If you already used sleep, extend its time.
The program or script that u run takes a bit of time to take over the system's standard input and out streams. If u pass all the commands and params immediately the parameters which were intented for the program goes to the system's bash instead !