headless Java : Java Glossary

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headless Java
When Java is implemented on a very small device, a keyboard, mouse or AWT (Advanced Windowing Toolkit) graphics support may not be available. You will get a HeadlessException if you try to instantiate one of the AWT classes. You code
import java.awt.GraphicsEnvironment;
...
// true if missing keyboard, mouse or screen.
// false if full keyboard, mouse and GUI screen support available.
boolean barebones = GraphicsEnvironment.isHeadless();
You can simulate a headless environment by setting the java.awt.headless system property:
-Djava.awt.headless=true
Oracle’s Javadoc on isHeadless class : available:

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