Headless Java on a Desktop

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Hello, Ive been trying to learn Java Swing but for some reason my java thinks that my desktop is a server and I therefore get headless exception errors and can't make a display. When I try to run FirstSwingExample.java I get this error:

Exception in thread "main" java.awt.HeadlessException
    at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:204)
    at java.awt.Window.<init>(Window.java:536)
    at java.awt.Frame.<init>(Frame.java:420)
    at java.awt.Frame.<init>(Frame.java:385)
    at javax.swing.JFrame.<init>(JFrame.java:189)
    at FirstSwingExample.main(FirstSwingExample.java:8)

I'm not sure what to do because there doesn't seem to be much information about this.