Unable to capture stdout, stderr from python.

Question

I am trying to read the stdout and stderr of a python program.
When I invoke anything else apart from python my class works fine.
The python program takes ca 1 sec to start. It then prints one line of text, then it prints a promt and waits for input from user.
I tryed with another program that behaves in the same way and there I got the first line. Not the prompt, that not a python but a native C program.
I have tried using BufferedReader but without sucess.
My class looks like this.
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.OutputStream;
public class Executer extends Thread {
    //read standard out output of the external executable
    //in seperate thread to avoid I/O deadlocks
    final int BUFFER = 2048;
    Process p;
    BufferedInputStream in;
    OutputStream out;
    StringBuffer strbuf;
    String[] cmdarr = null;
    public Executer(String path) {
        this.cmdarr = new String[] { path };
    public Executer(String[] path) {
        this.cmdarr = path;
    public void run() {
        try {
            System.out.println("doing call");
            p = Runtime.getRuntime().exec(cmdarr);
            in = new BufferedInputStream(p.getInputStream());
            strbuf = new StringBuffer();
            out = p.getOutputStream();
            int i;
            byte[] buf = new byte[BUFFER];
            String str;
                        while ((i = in.read(buf, 0, BUFFER)) != -1)
                            System.out.write(buf, 0, i);
        } catch (IOException e) {
            e.printStackTrace();
    public int killProcess() throws InterruptedException {
        p.destroy();
        try {
            in.close();
            System.out.println("Closed");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        return p.waitFor();
}Any ideas is appreciated.

Answer 1

When Runtime Exec Won't - a good article on running processes from a Java program...
Hope that helps;
lutha