The best way to fix the no x11 display variable was set, but this program performed an operation which requires it error

Question

Hi everyone, I'm learning about java. While working, I try to install a Java application on my Linux machine (Slackware). As a result, I get the message:

~$ 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.<init>(Window.java:407)
 at java.awt.Frame.<init>(Frame.java:402)
 at net.sourceforge.mlf.metouia.borders.MetouiaDotsBuf fer.<init>(MetouiaDotsBuffer.java:105)
 at net.sourceforge.mlf.metouia.borders.MetouiaDots.<i nit>(MetouiaDots.java:66)
 at net.sourceforge.mlf.metouia.borders.MetouiaToolBar Border.<init>(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.<init>(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)

What can I do about the “no x11 display variable was set, but this program performed an operation which requires it” issue? Is there a better approach?

lyytutoria · Accepted Answer

The cause:

Your app is not set automatically, it makes me surprised. I don't know whether you are trying to start this application from a non-graphic terminal or change the default .profile, .login, .bashrc or .cshrc or not. And I found that the DISPLAY environment variable has not been set correctly. I think these are the reason of your error.

Solution:

Noting that the DISPLAY value must be set to 0.0, it means that you use your user ID to log in to the main display. If it isn’t logged on or if it uses a different userrid, this will not success.

If you are from another computer and are at the main display, you can use “ssh –X hostname” (sudo -X) to connect to the host and ssh will send the X display back. ssh also checks that the DISPLAY variable is correctly set (provided it’s not being altered in the dot files). The value of “localhost:11.0” is a DISPLAY environment variable in a “ssh –X” session, it points to the socket that ssh tunnels to your local box.

If you are on the main display, let's do this:

export DISPLAY=:0.0

or if you use csh/tcsh, do as follow:

setenv DISPLAY :0.0

Alice Berthelot · Answer

Is this being done in an X11 environment A terminal window can be used, but it must be within X (either by running startx or after a graphical login).

Export DISPLAY=0 for bash-like shells (bash and sh) or setenv.DISPLAY:0 to access C shell-based shells like csh and tcsh (csh and tcsh) if you are already in a graphical environment.

You can connect from another machine using SSH. If there is an X server running, such as xming or your standard Linux Xserver, the -X option will display the graphical interface.

Cali Smith · Answer

You must enable X11 forwarding within your PuTTy

To do this, open PuTTy by going to Connect => SSH Tunnels.

You can also sudo to serve and export the following variable. IP is your local machine's address

export DISPLAY=10.75.75.75:0.0

Marion Roberts · Answer

It was very easy. I had the same problem and downloaded an app to help me display it.

This app xming is available to download:

http://sourceforge.net/project/downloading.php?

After installation, you can then make settings using this link

http://www.geo.mtu.edu/geoschem/docs/putty_install.html or follow this steps:

Installing/Configuring PuTTy and Xming

After PuTTy and Xming are downloaded to your PC, follow their instructions to install them.

Configuring

After Xming has been installed, launch the application called XLaunch and confirm that all settings are correct.

Click next to select the default entries in Display Settings windows.
Click next in the Session Type window.
Click next to Additional parameters window (Notice that the clipboard checkbox is checked)
Save configuration and click to Finish

Configuring PuTTy

Double-click the PuTTy icon from the desktop to install it. Then, configure the program as shown.

This is how to create a login profile and then save it.

Click on the checkbox to activate X11 forwarding.
In the X display location textbox type localhost.0.0

Save your profile and connect remotely to the server to perform tests.

Cheers!! !

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The best way to fix the no x11 display variable was set, but this program performed an operation which requires it error