ADDITIONAL SYSTEM INFORMATION :
Windows 10 Pro, Vs. 1803

java version "11" 2018-09-25
Java(TM) SE Runtime Environment 18.9 (build 11+28)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11+28, mixed mode)


A DESCRIPTION OF THE PROBLEM :
See above

REGRESSION : Last worked in version 10.0.2

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run the sample code.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Current squares are replaced by glyphs.
ACTUAL -
Squares only.

---------- BEGIN SOURCE ----------
// 0905, 096F and 097F are the Devanagari glyphs.

import javax.swing.*;

public class Unicode extends JFrame {
  final String TEXT= "Hello \u0905\u096F\u097F\u2611\u2600\u26FF\u2300\u23FF";

  public Unicode() {
    setSize(360,120);
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    setTitle(TEXT);
    Box box= Box.createVerticalBox();
    box.add(new JButton(TEXT));
    box.add(new JLabel(TEXT));
    box.add(new JTextField(TEXT));
    add(box);
    setVisible(true);
  }


  public static void main(String args[]) {
    SwingUtilities.invokeLater(Unicode::new);
  }

}

---------- END SOURCE ----------

FREQUENCY : always