HeadlessException
Thrown when code that is dependent on a keyboard, display, or mouse is called in an environment that does not support a keyboard, display, or mouse.
To set up headless mode use
java -Djava.awt.headless=true
HeadlessException
Thrown when code that is dependent on a keyboard, display, or mouse is called in an environment that does not support a keyboard, display, or mouse.
To set up headless mode use
java -Djava.awt.headless=true