Hi friends,

My JAVA program has to call c++ (kkk) application and JAVA opens 2
threads to read outputstream and errorstream from c++ application.
See the code below). Since errorstream is expecting some data it hangs
unless c++ feeds the same.
When I used alternative 'perror("")'/'perror(NULL)' in kkk.c hang gets
solved but c++ standalone program keeps throwing dummy error on
screen.
Could anybody help me here how it can be rectified.
Thanks in advance
- Krish

------------
start.java:
-----------
public class start
{
    public static void main(String [] args) throws
IOException,InterruptedException
    {
        String cmd = "/home/user/kkk";
        Process process = Runtime.getRuntime().exec(cmd);
        MyReader outReader = new MyReader(process.getInputStream());
        Thread outThread = new Thread(outReader);
        outThread.start();
        MyReader errReader = new MyReader(process.getErrorStream());
        Thread errThread = new Thread(errReader);
        errThread.start();
        System.out.println("exit code is " + process.waitFor());
        //process.destroy();
        //    process.getInputStream().close();
        //    process.getErrorStream().close();
       outThread.join();
       errThread.join();
        System.out.println("joins completed");
  }
}

/***** MyReader.java *******/

import java.io.*;
public class MyReader implements Runnable
{
    private final InputStream is;
    public MyReader(InputStream is)
    {
        this.is = is;
    }
    public void run()
    {
        // normally would read in while here, but these threads never get
any
        // they are blocked on the first read() call forever.
        int length;
        try
        {
          length = is.read();
          if (length == -1)
          {
            System.out.println("-1");
            return;
          }
          if (length == 0)
          {
            System.out.println("0");
            return;
          }
          System.out.println("read something");
        } catch (Throwable t) {
        System.out.println(t);
     }
 }
}

kkk.c:
-------
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
# include <sys/wait.h>

int main()
{
       perror ("");
//    perror (NULL);
       return 0;
}