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POCan Java Runtime.exec another java program that uses stdin?
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  1. POCan Java Runtime.exec another java program that uses stdin?
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    copied!<p>I have run into an issue where , when using Java Runtime to run another java program, the program freezes because the other program requires stdin . There is a problem with handling the stdin after executing another java program with Runtime exec() .</p> <p>Here is sample code that I can't get to work. Is this even possible?</p> <pre><code>import java.util.*; import java.io.*; public class ExecNoGobble { public static void main(String args[]) { if (args.length &lt; 1) { System.out.println("USAGE: java ExecNoGobble &lt;cmd&gt;"); System.exit(1); } try { String[] cmd = new String[3]; cmd[0] = "cmd.exe" ; cmd[1] = "/C" ; cmd[2] = args[0]; Runtime rt = Runtime.getRuntime(); System.out.println("Execing " + cmd[0] + " " + cmd[1] + " " + cmd[2]); Process proc = rt.exec(cmd); int exitVal = proc.waitFor(); System.out.println("ExitValue: " + exitVal); } catch (Throwable t) { t.printStackTrace(); } } } </code></pre> <p>And the ReadInput.java file:</p> <pre><code>import java.io.*; public class ReadInput { public static void main (String[] args) { // prompt the user to enter their name System.out.print("Enter your name: "); // open up standard input BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String userName = null; // read the username from the command-line; need to use try/catch with the // readLine() method try { userName = br.readLine(); } catch (IOException ioe) { System.out.println("IO error trying to read your name!"); System.exit(1); } System.out.println("Thanks for the name, " + userName); } } // end of ReadInput class </code></pre> <p>And, finally , the batch file that launches it:</p> <pre><code>@echo off echo. echo Try to run a program (click a key to continue) echo. pause&gt;nul java ExecNoGobble "java -cp . ReadInput" echo. echo (click a key to end) pause&gt;nul </code></pre> <p>I also posted the question here: <a href="http://forums.oracle.com/forums/message.jspa?messageID=9747449" rel="nofollow">http://forums.oracle.com/forums/message.jspa?messageID=9747449</a></p>
 

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