headless Java : Java Glossary
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headless Java
When Java is implemented on a very small device mouse or AWT graphics support may not be available. You will get a HeadlessException if you try to instantiate one of the AWT classes. You code cane determine if keyboard, mouse and screen are availble with: 
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
Sun’s Javadoc on the isHeadless method : available:
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