VM hangs after executing new Process please check attached program for recreating problem. This works fine in JDK1.1 Alpha build and previous releases.
I am running latest JDK1.1M.


To compile use command javac TestExec.java
and run command as follows:
java TestExec `which javac`

And observe that VM never exits. This will cause any program that waits for
VM to close stderr and stdout streams.


------------8<------------TestExec.java -----------------------

import java.io.*;
import java.awt.*;

class DisplayThread extends Thread {

  DataInputStream inStream;
  /**
   * Constructor
   */
  DisplayThread(DataInputStream stream){
    inStream = stream;
  }

  protected void display(String line) {
    System.out.println(line);
  }

  public void run() {
    String Line;
    try {
      while ((Line = inStream.readLine()) != null ) {
display(Line);
      }
    }
    catch (IOException i) { // Ignore exception
    }
  }
}


public class TestExec {

  private DataInputStream stdout,
         stderr;

  private DataOutputStream stdin;

  private Process newProc;

  protected DisplayThread dispStdout,
                          dispStderr;

  TestExec(String[] shellCmds) {
    try {
      // Get new runtime
      newProc = Runtime.getRuntime().exec(shellCmds);

      // Bind stderr First
      stderr = new DataInputStream(
new BufferedInputStream(newProc.getErrorStream(),1024));
      // Bind stdout
      stdout = new DataInputStream(
new BufferedInputStream(newProc.getInputStream(),1024));
      // Bind stdin
      stdin = new DataOutputStream(
new BufferedOutputStream(newProc.getOutputStream()));

      String Line;
      
      // Start Display Thread for Printing Messages in Background

      displayStdout(stdout);

      displayStderr(stderr);

      newProc.waitFor();
      System.out.println("Exit Value :" + newProc.exitValue());
    }
    catch (Exception i) {
      System.out.println(i);
    }
  }

  // This is interface that subclass can modify for stdout and stderr
  protected void displayStdout(DataInputStream stdout) {
    dispStdout = new DisplayThread(stdout);
    dispStdout.start();
  }

  // Display stdError
  protected void displayStderr(DataInputStream stderr) {
    dispStderr = new DisplayThread(stderr);
    dispStderr.start();
  }
  
  public static void main(String[] args) {
    System.out.println("Executing command :" + args[0]);
    TestExec t = new TestExec(args);
    System.out.println("Completed Successfully");
  }
}