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- java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it.
2. Otherwise, it might be looking for some graphics controller like X manager, which is not there, eventually
resulting in "No X11 DISPLAY variable was set" to be thrown.
at java.awt.GraphicsEnvironment.checkHeadless(Unknown Source)
at java.awt.Window.<init>(Unknown Source)