ps: jTextField is connected to masterTable - a table generated by Netbeans wizard for MySQL connection. Whenever I click the table - I see the jTextField changing. But AreaText is changing only once (first time).... why?
Impossible to say without more code. My guess is that your textfield gets replaced with a new one on occasion, and you do not add the property change listener to the new ones. But that is a guess based on no knowledge whatsoever.
Try to make a minimum example that shows the problem: an SSCCE (<- link). Perhaps in making the small example you will find the problem, and if not, you can post the small example so we can take a look at it and see why it is behaving the way it does. Did I stress enough the example should be small? ;)