GUI hangs on multiThreaded desktop application

Hello
i have one application which is like eclipse editor, but it can open one file at one time.it directly read file from server machine open it on JTextPane on right side on the event on double click on JTree node on the left side like eclipse.
some time file is too big so it take time to open the file on JTextPane, for i have to use the progressBar that show that openning file is on the way.
So main issue is like:
I used one Thread (ThreadOpen) to open the file on editor, which start an other Thread (ThreadProgress) to show the progressBar for openning the file. if i modify the file then there is event on tool bar to save the file on the server which also start a new Thread (ThreadSave) all is working fine.
but when i try to open a file means start ThreadOpen and if at that time previous file (which was open on the JTextPane) is not saved menas ThreadSave is not started before starting of ThreadOpen, then whole application hangs on ThreadProgess which show the progessBar, i also try without ThreadProgess it also hang the whole GUI.
first I think there may be syncronization issue {color:#ff0000}but whole GUI hangs when there is {color}{color:#ff0000}*NOT* starting of ThreadSave {color}{color:#ff0000}before starting of ThreadOpen if there was an already file open on the JTextPane.{color}
It work fine if save the file first means Start ThreadSave and after it open a file means start of ThreadOpen.
Any idea of Thead working in deep, please help..
Thanks ---
Atul java developer

verma018 wrote:
As i know the dead lock condition raise when there are two or more thread accessing the same resources,
But in my cases as i described earlier when I does not save the file means NOT start ThreadSave before the opening file means start of ThreadOpen, then the whole GUI hangs..
Means there is a compulsion that if there is any file already opened, then it must be saved before opening any other file otherwise GUI will hung up. It is forcing that start ThreadSave first then ThreadOpen if any file already opened.Others have said this, but it sounds like you are calling run() of a method, and not start. Either that or you do have a synchronized method that both threads call.
Kaj

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