HeadlessException when installing NetBeans

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I appears that you are setup to run the "headless" version of Java, which means it is missing the ability to display graphics or a graphic user interface, so it can't run the NetBeans installer. You need to install or activate the regular version of Java. You did that with the Oracle download, but just extracting it won't get it setup so it will use that version when you run the NetBeans installer.

You can see which Fedora Java packages you have installed with this command:

dnf list installed java*

If you only have the "headless" package installed, you need to install the regular version:

sudo dnf install java-1.8.0-openjdk

To see all your options:

dnf search openjdk

If you already have the full version installed, you need to activate it:

sudo update-alternatives --config java

If you want to activate the Oracle version instead (not necessary), follow the instructions here: https://ask.fedoraproject.org/en/question/49060/how-to-make-oracle-jdk-and-jre-as-default-java-in-fedora-20/

Let me know if you get stuck.

before begine the installation:
xhost +
su
install netbeans like always do, when it has finished:
exit
xhost -
Now at /usr/share/applications write this:
su -c "vi netbeans.desktop"
[Desktop Entry]
Encoding=UTF-8
Name=NetBeans IDE 8.2
Comment=The Smarter Way to Code
Exec=/bin/sh "/usr/local/netbeans-8.2/bin/netbeans"
Icon=/usr/local/netbeans-8.2/nb/netbeans.png
Categories=Application;Development;Java;IDE
Version=1.0
Type=Application


Then save:
:x!