Launching two thread and killing the original thread

Question

I'm having problems developing my application.
Hi,
I'm running and application wich has to self-update periodically. the way it's done is that i launch a different project, included in a different jar file. This project downloads an update for the application and relaunchs my application.
At first, i did that change of application using a process wich executes the update jar (using getRuntime.exec()), but it looks that once launched the process, my application waits until the update jar is finished.
I've thought to use parallel threads, i mean, my application is running on a thread, if update is necessary, then i create a thread wich executes the update jar and, once the download and update have been completed, create a new thread with my updated application, finishing the update thread after launching it.
Do you know if, once updated my application's jar, the new thread will be executed with my updated code?
I hope somebody can help me, thank you

Answer 1

well, on my computer works, but it has to work in the end on a PDA with a customized jdk from java 1.3, so i'm not sure yet if it works fine. Once i have done it, i will tell you