RFR: 6429812: NPE after calling JTable.updateUI() when using a header renderer + XP L&F [v5]

[Alexey Ivanov]

On Fri, 3 Jun 2022 15:21:02 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> > I think that the rendering to the BufferedImage as suggested by @aivanov-jdk should work as well.
> 
> In theory only. I was unable to make the table paint with its header to `BufferedImage`. The component isn't laid out until it's added to peered top-level. If you know how to make it paint as if in the frame, I'd welcome it. At this point, painting to `BufferedImage` doesn't reproduce the NPE.

I haven't been trying hard enough.

Painting *the header* to buffered image throws the NPE.

The test could be as simple as this:


        Dimension size = header.getPreferredSize();
        header.setSize(size);
        // Create the image and graphics
        header.paint(g2d);


You have to explicitly set size to the header.

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PR: https://git.openjdk.java.net/jdk/pull/8830