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Re: JScrollBar error

James Rome wrote:

My App in Java 1.5 has a DefaultStyledDocument in a JScrollPane.

I keep adding more text to the Document and removing them when the

Document.length() > 20000.

(And by the way, if you ever do this, the Document saves all the deleted

stuff unless you override methods in GapContent, which I do-- otherwise

you eventually run out of memory.)


But I would like always to set the scroll bar to the bottom of the

Document after entering text. I do this using:

   private void updateLength() {


...

It works if I leave out the jsb.setValue chunk of code. What am I doing

wrong?


The first thing I'd look for is a code path that could call updateLength on a thread other than the Swing thread. Add some code like this to updateLength:

    if (!SwingUtilities.isEventDispatchThread()) {
        System.err.println ("\n***** Not on EDT!");
        Thread.dumpStack();
    }

(this is from memory, I may have some minor goof-ups in the above code, but it should illustrate the point)

If the message appears, then updateLength has been called from another thread, and the stack trace will tell you how you got there.
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