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Created attachment 155877 [details] Warning dialogue I have run the netbeans-trunk-nightly-201509010002-javase-linux.sh installer and got a warning, see attachment.
Created attachment 155878 [details] Installer dialogue I choosed /usr (prefilled by default), see 2nd attachment.
Created attachment 155880 [details] Installer log I guess, the 2nd one in the zip file is the one you need.
It's a bit surprising that NB was released with this issue. It can be worked around by editing netbeans.conf and changing netbeans_jdkhome="/usr" to netbeans_jdkhome="/usr/lib/jvm/java" This works on Fedora 22. YMMV on other distros. (You can copy the correct value from a prior install of NB.)