Java Threading Error IllegalThreadState thread already started

Question

Whenever I start my thread I always do this check. I did not find anywhere that I called start on thread without doing the check below

if (!myThread.isAlive())
    myThread.start();

Nevertheless, I end up with IllegalThreadStateException : Thread already started. This actually crashes my app (android). So is there some other check I need to do before starting up a thread?

Answer 1

You should check if the thread has already started using getState() and start it only if its state is NEW, otherwise create new thread (if needed).

Answer 2

Do you create a new instance for myThread reference using new? You can only perform myThread.start() once on a single instance.

Checking if it is alive is not the right way. Create a new instance.