GLException with SWT Demo

Hi!
When trying to run the SWT Demo (snippet209), I got:

Exception in thread "main" javax.media.opengl.GLException: Error: attempted to make an external GLContext without a valid pixelformat
        at com.jogamp.opengl.impl.windows.wgl.WindowsExternalWGLContext.create(WindowsExternalWGLContext.java:74)
        at com.jogamp.opengl.impl.windows.wgl.WindowsWGLDrawableFactory.createExternalGLContext(WindowsWGLDrawableFactory.java:197)
        at demos.swt.Snippet209.main(Snippet209.java:83)

What should be a valid pixel format? How should I set it?
Regards,
Martin
ps: I am running on WinXP with a NVidia GeForce 7300.

I've seen this on 32-bit Windows XP myself, but haven't tracked it down fully yet. A comment on my tutorial at http://wadeawalker.wordpress.com/2010/10/09/tutorial-a-cross-platform-workbench-program-using-java-opengl-and-eclipse/ said you can work around it like this:

david wrote

import com.jogamp.opengl.impl.windows.wgl.GDI;

insert this line : GDI.GetDC(glcanvas.handle);
after this line: glcanvas.setCurrent();

He apparently found that at http://www.javagaming.org/index.php?action=printpage;topic=21387.0, but there's no bug entry for it yet. I'll look into this and create a bug if needed.

Thanks Wade, that works now. FYI, the javadoc on GLCanvas.handle [0] says:

IMPORTANT: This field is not part of the SWT public API. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms and should never be accessed from application code.

[0] http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.platform.doc.isv/reference/api/org/eclipse/swt/opengl/GLCanvas.html

Martin wrote

IMPORTANT: This field is not part of the SWT public API.

Yeah, this isn't the real solution, it's just a workaround for right now so your development isn't stopped  Once we have a clean solution, I'll post an update here so you can take this workaround out.

Don't use this workaround on Linux please.

I finally duplicated this bug on two different Windows XP systems and entered a full bug report at http://jogamp.org/bugzilla/show_bug.cgi?id=429. You should be able to CC yourself on this report to be notified when the bug gets fixed.

Great! Thanks for the CC suggestion. I did it!