Can screen saver stop swing JTable from working?

I have an application, with a JTable inside JFrame. The application will be idle for a long period of time, like hours, even days. Then at a specific time, a TimerTask will remove all entries to the JTable, and add entries to the table too.
I notice the following things:
1. With screen saver, it is most likely the JTable will contain no entries even from my debug messages, the entries were added.
2. Without screen saver, it works with entries added to the JTable.
My question is whether it is my problem, or it is know that screen saver will have some effect on the components?
Please help, this is making me crazy!

Just got a glimpse of the top bar across the screen when the screen saver tried to launch. It is trying to use the ancient Apple system with the rainbow colored apple in the upper left...if that helps anyone.

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Can screen saver stop swing JTable from working?

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