No X11 DISPLAY variable - what does it mean

Question

I am trying to install a Java application on my Linux machine  Slackware     I have received the following error  and I do not understand it    Could you advise me how to approach the problem  Thank you   Here is what I get   I see that some X11 DISPLAY variable needs to be set  but what value should I give it and how       java -jar gate-5 0-beta1-build3048-installer jar - ERROR -  java awt HeadlessException  No X11 DISPLAY variable was set  but this program performed an operation which requires it  java awt HeadlessException  No X11 DISPLAY variable was set  but this program performed an operation which requires it  at java awt GraphicsEnvironment checkHeadless Graphic sEnvironment java 159  at java awt Window  lt init gt  Window java 407  at java awt Frame  lt init gt  Frame java 402  at net sourceforge mlf metouia borders MetouiaDotsBuf fer  lt init gt  MetouiaDotsBuffer java 105  at net sourceforge mlf metouia borders MetouiaDots  lt i nit gt  MetouiaDots java 66  at net sourceforge mlf metouia borders MetouiaToolBar Border  lt init gt  MetouiaToolBarBorder java 49  at net sourceforge mlf metouia MetouiaLookAndFeel ini tComponentDefaults MetouiaLookAndFeel java 241  at javax swing plaf basic BasicLookAndFeel getDefault s BasicLookAndFeel java 130  at javax swing plaf metal MetalLookAndFeel getDefault s MetalLookAndFeel java 1591  at javax swing UIManager setLookAndFeel UIManager jav a 537  at javax swing UIManager setLookAndFeel UIManager jav a 581  at com izforge izpack installer GUIInstaller loadLook AndFeel GUIInstaller java 373  at com izforge izpack installer GUIInstaller  lt init gt  G UIInstaller java 116  at sun reflect NativeConstructorAccessorImpl newInsta nce0 Native Method  at sun reflect NativeConstructorAccessorImpl newInsta nce NativeConstructorAccessorImpl java 39  at sun reflect DelegatingConstructorAccessorImpl newI nstance DelegatingConstructorAccessorImpl java 27  at java lang reflect Constructor newInstance Construc tor java 513  at java lang Class newInstance0 Class java 355  at java lang Class newInstance Class java 30 at com izforge izpack installer Installer main Instal ler java 62

User · Answer

I have had the same issue in Ubuntu 14 04 01 when I tried to install JDK 8 and Netbeans if I launch the script inside a Byobu terminal  maybe with Screens happens the same    Just exit Byobu and  in a graphical terminal  run the script

User · Answer

you must enable X11 forwarding in you PuTTy  to do so open PuTTy  go to Connection    SSH    Tunnels and check mark the Enable X11 forwarding   Also sudo to server and export the below variable here IP is your local machine s IP  export DISPLAY 10 75 75 75 0 0

User · Answer

If you re on the main display  then  export DISPLAY  0 0   or if you re using csh or tcsh  setenv DISPLAY  0 0   before running your app   Actually  I m surprised it isn t set automatically   Are you trying to start this application from a non-graphic terminal   If not  have you modified the default  profile   login   bashrc or  cshrc   Note that setting the DISPLAY to  0 0 pre-supposes that you re sitting at the main display  as I said  or at least that the main display is logged on to your user id   If it s not logged on  or it s a different userid  this will fail     If you re coming in from another machine  and you re at the main display of that machine and it s running X  then you can use  ssh -X hostname  to connect to that host  and ssh will forward the X display back   ssh will also make sure that the DISPLAY environment variable is set correctly  providing it isn t being messed with in the various dot files I mentioned above    In a  ssh -X  session  the DISPLAY environment variable will have a value like  localhost 11 0   which will point to the socket that ssh is tunnelling to your local box

User · Answer

One more thing that might be the problem in a case similar to described - X is not forwarded and  DISPLAY is not set when  xauth  program is not installed on the remote side  You can see it searches for it when you run  ssh -Xv ip address   and  if not found  fails  which s not seen unless you turn on verbose mode  a fail IMO   You can usually find  xauth  in a package with the same name

User · Answer

Are you running this from within an X11 environment  You can use a terminal window  but it has to be within X  either after a graphical login  or by running startx     If you re already within a graphical environment  try export DISPLAY  0 for bash like shells  bash  sh  etc  or setenv DISPLAY  0 for C shell based shells  csh  tcsh  etc   If you ve connected from another machine via SSH  you use the -X option to display the graphical interface on the machine you re sitting at  provided there s an X server running there  such as xming for windows  and your standard Linux X server

User · Answer

There are many ways to do this  I did something below convenient to me and always works fine    On your remote server  make sure to install xorg-x11-xauth  xorg-x11-font-utils  xorg-x11-fonts  Run the Xming Server on you local desktop On putty  before ssh to the server  enable the X11 forwarding and set the display location to localhost 0 0 On the server   Xauthority file is generated and notice that the DISPLAY variable is already set     xauth list    xauth add    To test it  type xclock or xeyes  Note  To switch user  copy the  Xauthority file to the home directory of the respective user and also export the DISPLAY variable from that user

User · Answer

Very Easy  Had this same problem then what i did was to download and install an app that would help in displaying then fixed the error   Download this app xming   http   sourceforge net project downloading php   Install  then use settings on this link   http   www geo mtu edu geoschem docs putty install html or follow this steps   Installing Configuring PuTTy and Xming  Once PuTTy and Xming have been downloaded to the PC  install according to their respective instructions   Configuring Xming  Once Xming is installed  run the application called  XLaunch  and verify that the settings are as shown    select Default entries on Display Settings windows  click next click next on Session Type window  click next on Additional parameters window Notice clipboard checkbox is true  save configuration and click to finish    Configuring PuTTy  After installing PuTTy  double-click on the PuTTy icon on the desktop and configure as shown   This shows creating a login profile then saving it    On ssh -  X11  click on checkbox to enable X11 forwarding  on X display location textbox  type localhost 0 0   save profile then connect remotely to server to test   Cheers

User · Answer

Initial Check   1  When you are exporting the DISPLAY to other machine  ensure you entered the command xhost   on that machine  This command allows to other machine to export their DISPLAY on this machine  There may be security constraints  just know about it  Need to check ssh -X MachineIP will not require xhost       2  Some times JCONSOLE won t show all its process  since those JVM process may run with different user and you are exporting the DISPLAY with another user  so better follow CD DIR gt sudo   jconsole  3  In WAS  WEBSPHERE   jconsole won t be able to connect its java server process  that time just go till the link  then try connecting it  This worked for me  May be this page is initializing some variables to enable jconsole to connect with that server   WAS console   Application servers   server1   Process definition   Java Virtual Machine     I have faced the same issue with AIX  where command line interface only available  There is no DISPLAY UI  machine  I resolved by installing     NX Client for Windows   Step 1  Through that Windows machine   I connected with unix box where GUI console is available  Step 2  SSH to the AIX box from that UNIX box  Step 3  set DISPLAY like  export DISPLAY UNIXMACHINE NXClientPORTConnectedMentionedOnTitle  Step 4  Now if we launch any programs which requires DISPLAY  it will be launched on this UNIX box      VNC    If you installed VNC on UNIX box where display is available  then Windows and NX Client is not required   Step 1  Use VNC to connect with Unix box where GUI console is available  Step 2  SSH to the AIX box from that UNIX box  Step 3  set DISPLAY like  export DISPLAY UNIXMACHINE VNCPORT  Step 4  Now if we launch any programs which requires DISPLAY  it will be launched on this UNIX box   ELSE   Step 1  SSH to the AIX box from that UNIX box  Step 2  set DISPLAY like  export DISPLAY UNIXMACHINE VNCPORT  Step 3  Now if we launch any programs which requires DISPLAY  it will be launched on this UNIX box

User · Answer

For those who are trying to get an X Window application working from Windows from Linux   What worked for me was to setup xming server on my windows machine  set X11 forwarding option in putty when I connect to the linux host and put in my windows ip address with the display port and then the display variable with my windows IP address 0 0  Dont forget to add the linux hosts IP address to the X0 hosts file to ensure that the xming server accepts traffic from that host  Took me a while to figure that out

User · Answer

Don t forget to execute  host    on your  home  display machine  and when you ssh to the machine you re doing  ssh -x hostname

[java] "No X11 DISPLAY variable" - what does it mean?

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