What is java.awt.headless ?

As well detailed in the article below,

Java contains a lot of classes which assume that there is a some sort of display and a keyboard attached. Sometimes, you are writing code to run on a server which does not have these and this is called Headless mode

For some Java-based web applications, graphics can be generated. Either you need to configure the application to use the local X Window server or use the Java Headless option.

Source :

Use case example for headless image processing :

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