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Message: [QUOTE="Thomas Weidenfeller, post: 569452"] A couple of things: 0. As mentioned a thousand times in this newsgroup, please provide complete (has a main(), compiles, runs), small source code, not snippets. On reason: See next point 1. You don't show the way you run exec(). It might well be that you block something there. You would at least have: - a thread to read from stdout of the external program - another thread to read from stderr of the external program (very popular to forget this) And if you provide input: - thread nbr. three, if you don't want to block your current thread Also: - possibly a waitFor() in your current thread so you get informed when the external program terminates. 2. This is doomed to block the EDT. What you are in fact doing is you schedule one callback on the EDT (your Runnable). The run() method gets at some point in time executed on the EDT. So your while() loop starts running in the EDT. You while() loop runs "endlessly", effectively blocking the EDT for every. class TextAreaUpdater implements Runnable { JTextArea ta; String line; public TextAreaUpdater(JTextArea ta, String line) { this.ta = ta; this.line = line; } public void run() { ta.append(line); : [/QUOTE]