Catch the process id number in unix

Question

With my java program I run command in Unix. This application I start in background (nohup start.sh &). How can I catch the process ID number of my application? I use next string for code:
String command[] = {"/bin/sh", "-c", "/bin/" + command, "/bin/searcId"};
In run this line whit Runtime.exec()
command is "nohup start.sh &" and the searchId is a Unix script for catching process ID number (this script works fine, when I run it in Unix).
What can be wrong???
MArko

Answer 1

I arrived at this thread doing a Google search on how to obtain the process id of an executable launched from Java. The following code is not recommeded for released code, but it was helpful for my debugging purposes.
try
    Process proc = Runtime.getRuntime().exec("executable");
    Field pidField = proc.getClass().getDeclaredField("pid");
    //pid field in UNIXProcess class is private - make it accessible
    pidField.setAccessible(true);
    System.out.println("Exec'ed process ID is: " + pidField.get(proc));
catch (Exception e)
    e.printStackTrace();
}The process id field for the UNIXProcess is "pid." On Windows, I believe it is "handle."