> But, I got error when running application directly in the Netbeans 5.0 IDE. ( I tried to run application by 'running project' of IDE menu).
I use 5.5 beta and the configuration provided by lg3d/nbproject. This allows me to run LG3D from the IDE menu. It looks like you are trying to run the app directly. I haven't tried it yet...
> Caused by: java.lang.NullPointerException
> at org.jdesktop.lg3d.displayserver.EventProcessor.addListener(EventProcessor.java:350)
This NPE is happening at a very unusual place (assuming you are using the same version 1.11 of EventProcessor)...
Anyhow, I thought you might want to check out the configuration provided by the lg3d/nbproject. It may include some hint...
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