Getting a HeadlessException No X11 DISPLAY variable was set

Question

Exception in thread  main  java awt HeadlessException      No X11 DISPLAY variable was set  but this program performed an operation which requires it          at java awt GraphicsEnvironment checkHeadless GraphicsEnvironment java 159          at java awt Window  lt init gt  Window java 432          at java awt Frame  lt init gt  Frame java 403          at javax swing JFrame  lt init gt  JFrame java 202          at DrawGUI  lt init gt  DrawGUI java 15          at ShapeCreator  lt init gt  ShapeCreator java 31          at ShapeCreator main ShapeCreator java 138    What does this error message mean  And how can I solve it

User · Answer

Problem statement     Getting  java awt HeadlessException while trying to initialize java awt Component from the application as the tomcat environment does not have any head terminal     Issue     The linux virtual environment was setup without a virtual display terminal  Tried to install virtual display     Xvfb  but Xvfb has been taken off by the redhat community   Solution     Installed    xorg-x11-drv-vmware x86 64    using yum install xorg-x11-drv-vmware x86 64 and executed startx  Finally set the display to  0 0 using export DISPLAY  0 0 and then executed xhost

User · Answer

This appears to be a more general SWING AWT JDK problem that just the JBOSS installer   The accepted answer below solved the issue for me    Unable to run java gui programs with ubuntu    sudo apt-get install openjdk-6-jdk

User · Answer

I assume you re trying to tunnel into some unix box   Make sure X11 forwarding is enabled in your PuTTY settings

User · Answer

I think you are trying to run some utility or shell script from UNIX LINUX which has some GUI  Anyways   SOLUTION  dude all you need is an XServer  amp  X11 forwarding enabled  I use XMing  XServer   You are already enabling X11 forwarding  Just Install it XMing  and keep it running when you create the session with PuTTY

User · Answer

Your system does not have a GUI manager  Happens mostly in Solaris Linux boxes  If you are using GUI in them make sure that you have a GUI manager installed and you may also want to google through the DISPLAY variable

[java] Getting a HeadlessException: No X11 DISPLAY variable was set

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