Creating a scrollback buffer using a JTextPane

Hi all, I've run into a problem with an application I'm developing, and I'm hoping to find some help here. This is my first crack at a designing anything worthwhile using Swing, so please bear with me. :)
My problem: I need a buffer to store a certain number of lines of text, then when the maximum is reached, start removing the oldest lines. eg) max of 10 lines, when line 11 is received, line 1 is removed.
The JTextPane is contained in a JScrollPane, so the actual scrolling is taken care of.
Also, somewhat related, how can I force the JScrollPane to stay at the "bottom" of the pane? When new data is received from the server, it's added to the JTextPane, but I can't seem to find a way to force it to stick to the bottom.
Any help will be greatly appreciated. :)

Could you use the system line terminator to determine how many lines of text are in the JTextPane? If so, you can simply find the first line, and remove it, then re-set it back into the JTextPane. A StringBuffer would probably be beneficial for the manipulation.
For the JScrollPane you could try using the getVerticalScrollBar() method to get the vertical scroll bar, then set the it's value to it's maximum value, to try and force it to the bottom of the scrolling region.

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