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i open the editor, no matter what kind of file. in the terminal, i run this command: sleep 3; echo bubu | xsel -ib; xdotool key Ctrl+v then i quickly focus on netbeans. the string "bubu" does not get pasted (it does on any other X application). furthermore, after running that command i'm not able anymore to copy-paste from system to netbeans. netbeans "internal" copy-paste still works.
even simplier: write anywhere any string, then copy it in the clipboard (let's say "gaga"). in the terminal run this command: echo bubu | xsel -ib then switch to netbeans and if ctrl+v is pressed the string "gaga" gets pasted, not "bubu". after that xsel command copy-paste from system to netbeans won't work anymore...
another test: installed ubuntu 14.04.02 LTS on a virtualbox virtual machine. run sudo apt-get install netbeans xsel launched netbeans run echo bubu | xsel -ib on the terminal pressed ctrl+v in netbeans: nothing happens