[java] So that Java Doesn't Lock the Console

It's very hard to understand what exactly your question is. Can you explain yourself a little clearer please.

If you are trying to run a server in your application and still be able to type into the console then you should look at threads

public class ServerConsole extends Thread{	public ServerConsole()	{		start(); // start thread		while(true)		{			// get input			// process input		}	}	public void run()	{		//server code here	}}

When I launch a java application with

root# java -jar myserver.jar

I can't type anything further into the Linux terminal until the program is finished running. This is a problem.

Here is a sample as simple as I can make it of what I think you are looking for. You should be able to get what you want from it.

import java.net.*;import java.io.*;import java.util.*;public class TestConsole implements Runnable{	public void run()	{		Scanner s = new Scanner(System.in);		while(true)		{			String str = s.next();			System.out.println("You Said: " + str);		}	}	public TestConsole()	{		try		{			Thread t = new Thread(this);			t.start();			ServerSocket socket = new ServerSocket(5555);			Socket s;			while(true)			{				s = socket.accept();				BufferedWriter out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));				out.write("Hello From Server");				out.close();				s.close();			}		}		catch(Exception e){System.out.println(e);}	}	public static void main(String[] args)	{		new TestConsole();	}}

Quote:

Original post by Lednakashim When I launch a java application with root# java -jar myserver.jar I can't type anything further into the Linux terminal until the program is finished running. This is a problem.

Execute it as:


java -jar myserver.jar&

The & at the end will make it run in the background.

Since you're on Linux, just append an ampersand to the end of the command to run it in the background:

    root# java -jar myserver.jar &

To bring it to the foreground you can use the fg [jobid] command (use the jobs command to see the ids for all the jobs).

Or you could simply open up another terminal window to run other commands.

[EDIT]
Beat to the chase!

OMG I didn't understand what the question was. I thought you where trying to accept text in your program. Ah well you got your answer now.

That's handy to know all the same about the amp at the end. I'd presume that will work in FreeBSD also. I've been running a JBoss server on my BSD box and would always leave a terminal open while it was running because of the way it blocks.

You might also want to take a look at the screen command.

Job control (the & and the bg/fg commands) are features of the shell (e.g. Bash), rather than of any specific OS.

Putting a job in the background with a &, is usually paired with 'nohup', e.g:

root# nohup java -jar myserver.jar &

It's not required, but using nohup will prevent the process being killed if you log out. This is very useful if you start the process on a remote machine via SSH and then log out.

You can also use Control+Z to suspend a currently running process, then bg to put it in the background:

root# java -jar myserver.jar
<press control+z>
[1]+ Stopped java -jar myserver.jar
root# bg 1

Regards
elFarto