All my java applications now throw a java.awt.headlessexception

Question

So a couple days ago I had several working Java applications using the Swing library, JFrame in particular. They all worked perfectly fine and now

Answer 1

Multiple Linux distros have separate packages for the base of the JRE vs the JRE GUI.

On RHEL7/CentOS 7 for example, if you only have this package installed:

• java-1.8.0-openjdk-headless

You also need to install this package:

• java-1.8.0-openjdk

Answer 2

You can try to change a JRE you are currently using. Go to the "Run Configuration" of your project and change a JRE from your project's default to a Java Platform "standard" version.

Answer 3

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

Using Headless Mode in the Java SE Platform