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Exception in thread “awt-eventqueue-0” java.awt.headlessexception: blog classification: exception

Exception in thread "AWT-EventQueue-0" 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)

Solution:

Add this in the Java startup parameter

Java code

-Djava.awt.headless= true