Bug 9430

Description Randy Coulman 2002-02-11 16:55:19 EST

We have an application that launches a command-line process using 
Runtime.exec(), then uses Process.getInputStream() to read what is output on the 
console.  It has a loop waiting for the stream to be ready() before actually 
trying to read any input.  When running this application from the command line 
or from Kawa (our hopefully soon-to-be-previous Java development environment), 
this works fine.  However, when running (or debugging) under Eclipse, the call 
to ready() never succeeds.

This is done during the startup of our application, so we are completely unable 
to run or debug using Eclipse because of this problem.

Here is a small, self-contained example program that illustrates the problem.  
If you run or debug this in Eclipse, it will hang on the while(!in.ready()) 
loop.  If you run from the command line, using the class file compiled by 
Eclipse, the program runs to completion.

I am using Eclipse 2.0 latest stable build (01/25/2002) and Sun's JDK 1.3.0.

import java.io.*;

public class BugTest
{
	public BugTest()
	{
		super();
	}

	public static void main(String[] args)
	{
		try
		{
			System.out.println("Running command...");
			Process p = (Runtime.getRuntime()).exec("command.com /C 
ipconfig /all");
			BufferedReader in =
				new BufferedReader(new 
InputStreamReader(p.getInputStream()));
			while (!in.ready())
			{
			}
			System.out.println("Will never get here.");

			while (in.ready())
			{
				System.out.println(in.readLine());
			}
			p.destroy();
		}
		catch (Exception e)
		{
			System.out.println(e.getMessage());
			e.printStackTrace();
		}
	}
}