package sun.awt does not exist

问题

When compiling with ant, calls to sun.awt.AppContext work, however the same code compiled with IntelliJ fails using AdoptOpenJDK11.

sun.awt.AppContext with Oracle JDK8 works with IntelliJ
sun.awt.AppContext with AdoptOpenJDK11 does NOT work with IntelliJ

Although Sun/Oracle has warned for a while about avoiding the sun.* packages, there are certain features (bugs?) in Java that still require them and stranger, the command line seems happy.

Sample code:

package test;

import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import sun.awt.AppContext;

public class Main {

    public static void main(String[] args) {
        //Update printer list in CUPS immediately
        AppContext.getAppContext().put(PrintServiceLookup.class.getDeclaredClasses()[0], null);

        PrintService[] printers = PrintServiceLookup.lookupPrintServices(null, null);
        for (PrintService p : printers) {
            System.out.println(p.getName());
        }
    }
}

How does one configure IntelliJ to behave like ant and allow access to sun.awt.* packages?