Java GUI appears blank

[Jeff R]

XMonad has a SetWMName (http://xmonad.org/xmonad-docs/xmonad-contrib/XMonad-Hooks-SetWMName.html) function as a workaround to prevent Java GUIs (AWT I believe) from appears as only a gray rectangle. In my case, Intellij fails to paint. As a first pass I tried, inside of XlibWindowSystem::new() changing
let name = (*CString::new(&b"wtftw"[..]).unwrap()).as_ptr();
to
let name = (*CString::new(&b"LG3D"[..]).unwrap()).as_ptr();
but the issue still remained.

[Simon Wollwage]

export _JAVA_AWT_WM_NONREPARENTING=1

This should fix it

[Jeff R]

Setting the environment variable didn't work but calling wmname LG3D did. Thanks

[Simon Wollwage]

Ok. For me the env variable helped with IntelliJ. But if that works too, great :D

[Łukasz]

In config.rs:

run!("wmname", "LG3D")(w, w, w);

[Chris A.]

I had to do wmname LG3D for Xmonad to get Intellij to work, it's a pretty common problem.