java jscrollpane

Question

I have a problem with displaying the components of a JScrollPane. Let me first explain the context. I've got one big splitpane:

        center = new JSplitPane(JSplitPane.VERTICAL_SPLIT, p, p1);
        center.setDividerLocation(0.9);
        center.setDividerSize(3);
        center.setResizeWeight(1);
        center.setContinuousLayout(true);

The p pane is shown the right way, no problem here. But the p1 pane won't be displayed, i can see the empty bottom-part of the splitPane, but that's all.

        JPanel p = new JPanel();
        p.add(canvas);
        JPanel p1 = new JPanel();
        p1.add(canvasPropPane);

The canvasPropPane is a scrollPane that i initialize like this:

        VolumeSizeAndPosition volum = new VolumeSizeAndPosition();
        canvasPropPane = new JScrollPane(volum);

volume was tested on an independent frame and have been shown the right way. I tried showing on the canvasPropPane a simple button canvasPropPane.add(wildButton); and it has a strange behavior: it paints the button only after i hover the mouse over it's location; at repaint (after resizing the scrollpane) it disappears.

Answer 1

I've solved similar problems by calling invalidate() on all of the underlying nested Swing objects. So for your particular question p.invalidate() and p1.invalidate() may help. I believe this strange behavior to be a bug in Swing.