I found a clue to change the session type of Gnome.. :

I edited the file  /etc/gdm/custom.conf ,
end  uncommented the row :

#WaylandEnable=false

...

After I made it, (now) I get

*Type=x11  *(as output of loginctl show session 2 -p Type,)

but
as well this , the output that I get running the .sh script is the same..

-------------------
root@localhost Downloads]# ./netbeans-8.2-linux.sh
Configuring the installer...
Searching for JVM on the system...
Extracting installation data...
Running the installer wizard...
Can`t initialize UI
Running in headless mode

Exception: java.awt.HeadlessException thrown from the
UncaughtExceptionHandler in thread "main"
-------------------

now need to find another way .....

On Sat, Apr 21, 2018 at 11:20 AM, Angelo Moreschini <
mrangelo.fed...@gmail.com> wrote:

> hi,
>
> with java is OK .
> I downloaded all  together (jdk and NetBeans)   from the Oracle site... :
>
> ----------
> [angelo_dev@localhost ~]$
>
> *java -version*
>
> *openjdk version "1.8.0_31"OpenJDK Runtime Environment (build
> 1.8.0_31-b13)OpenJDK 64-Bit Server VM (build 25.31-b07, mixed mode)*
>
> [angelo_dev@localhost ~]$ *javac -version*
>
> *javac 1.8.0_31*
> ----------
>
> After I posted the previous message I learned more ,
> and now I am about sure that the  problem come from the graphic
> environment of Linux...
>
> After I Installed Fedora 27 I got to use a Wayland session of gnome,
> instead the usual X11 session :
>
> if I do :
> *loginctl show session 2 -p Type,*
> I get
> *Type=wayland*
> instead that
> *Type=x11* (that is the value I get on computer where is Fedora 21)
>
> Wyland is not good environment for running the graphical program that is
> used to install netBeans... (the .sh script)
>
> So I am looking now how I can return to  session X11 inside Gnome...
>
> On Sat, Apr 21, 2018 at 12:19 AM, Samuel Sieb <sam...@sieb.net> wrote:
>
>> On 04/20/2018 06:22 AM, Angelo Moreschini wrote:
>>
>>> [root@localhost Downloads]#*./netbeans-8.2-linux.sh <
>>> http://netbeans-8.2-linux.sh>*
>>> Configuring the installer...
>>> Searching for JVM on the system...
>>> Extracting installation data...
>>> *Running the installer wizard...*
>>> *Can`t initialize UI
>>> Running in headless mode*
>>>
>>> *Exception: java.awt.HeadlessException thrown from the
>>> UncaughtExceptionHandler in thread "main"*
>>> --------------------
>>> This is a problem about the java environment ?
>>> it can be also a problem with the graphical environment of fedora ... (?)
>>>
>>
>> An application running as root can't access the display when using
>> Wayland.
>>
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>>
>
>
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