I am facing an issue calling an external program from java with timeout. I got the below code. This program tries to open notepad.exe through java and terminates after 5 seconds. The problem I am facing is that although its terminating the notepad, the java process still remains active (eclipse does not terminate). Experts please help!
public class ExecTest {
public static void main(String[] args) {
System.out.println("STARTING");
new ExecTest().callNotepad();
System.out.println("ENDING");
}
public ExecTest() {
}
private void callNotepad() {
ProcessBuilder pb = new ProcessBuilder("notepad.exe");
pb.redirectErrorStream(true);
try {
Timer t = new Timer();
pb.redirectErrorStream(true);
Process p = pb.start();
TimerTask killer = new TimeoutProcessKiller(p);
t.schedule(killer, 5000);
try {
InputStream is = p.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line = "";
while ((line = br.readLine()) != null) {
System.out.println(line + "\n");
}
p.waitFor();
System.out.println("HERE!");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
System.out.println("Cancelling timer");
killer.cancel();
System.out.println("Cancelled timer");
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class TimeoutProcessKiller extends TimerTask {
private Process p;
public TimeoutProcessKiller(Process p) {
this.p = p;
}
@Override
public void run() {
System.out.println("Destroying thread p=" + p);
p.destroy();
System.out.println("Destroyed thread p=" + p);
}
}
You have cancelled the TimerTask killer
instead of the Timer t
.
Just exchange killer.cancel();
with t.cancel()
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