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I'm trying to use dwm Windows Manager, everything is fine (1mb ram ;) but when I run netbeans it load but with a grey and empty interface. (it works fine in Unity or E17 )

Any Idea ?

I have found out this but the solutions proposed doesn't work for me

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Did you mean 1 GB of RAM? – Sly Oct 2 '12 at 5:23
I mean dwm consumes 1mb of ram – Francesco Oct 3 '12 at 5:42
Ah. Got'cha. I thought you meant altogether for your system. – Sly Oct 3 '12 at 11:05
up vote 4 down vote accepted

Perhaps your issue is the same as this xmonad issue?

The Java gui toolkit has a hardcoded list of so-called "non-reparenting" window managers. xmonad is not on this list (nor are many of the newer window managers). Attempts to run Java applications may result in `grey blobs' where windows should be, as the Java gui code gets confused.

A solution is to export _JAVA_AWT_WM_NONREPARENTING=1.

Edit: According to, you can also use "wmname LG3D" to hack the window manager's name.

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thank you: this fixed the issue wmname LG3D – Francesco Sep 28 '12 at 14:34
Thanks, and I was about to think the window manager I'm working on is broken. – weltensturm Sep 21 '15 at 18:16

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