Keeping the scrollbar at the top when appending to a textArea

I have a JTextArea with a veritcal scroll bar on the right side. Everything works fine scrolling wise except for the position of the of the knob ( I believe that's what it's called) after the text area is appened to.
The knob automatically goes to the lowest position and I can't figure out how to keep it at the top.

To clarify further,
After ammending the text area I've inserted these lines
System.out.println(slider.getVerticalScrollBar().getMinimum());
System.out.println(slider.getVerticalScrollBar().getMinimum());
slider.getVerticalScrollBar().setValue(0);The print statements were just to check. They're both returning 0 though...I'm not entirely sure that means. The third line doesn't appear to have any effect

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Keeping the scrollbar at the top when appending to a textArea

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