java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it.

The erro:

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:207)
        at java.awt.Window.<init>(Window.java:535)
        at java.awt.Frame.<init>(Frame.java:420)
        at java.awt.Frame.<init>(Frame.java:385)
        at javax.swing.JFrame.<init>(JFrame.java:180)



To fix it

1. Install and config Xming on your desktop. Download Xming from https://sourceforge.net/projects/xming/    Run the executable file to install it.

2. Ensure that the Enable X11 forwarding is checked in your PuTTY Configuration. And the X display location is set to :0.0.

3. On the linux machine

      export DISPLAY=localhost:11.0

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