Re: Swing - paintComponent not called

Whoa! Hold on there! This is a completely different problem.
 
If you're creating a new thread, there are various constraints on how
you can update the GUI from that thread. If you are attempting to do
more than repaint, revalidate or invalidate you should expect to have
problems. Virtually all other Swing methods must take place on the EDT.
 
When you say you are "calling the method from actionPerformed" do you
mean paintComponent or some method --as yet not shown-- which invokes
new ProgressFrame () ? I'm guessing the latter in which case your main
problem is probably threading, but if not calling paintComponent is
probably the wrong thing to do anyway.
 
You will have to show what openFile does and explain how it connects to
new ProgressFrame. At this point it would probably be best if you put
together a test program that actually demonstrates the problem (as
opposed to the code you sent that does not.)