CompositeGlyphMapper.java#getGlyphCode return a negative number

A DESCRIPTION OF THE PROBLEM :
When I used BlueJ, I found a problem with Chinese display. /javafx.graphics/com/sun/javafx/font/CompositeGlyphMapper.java#getGlyphCode may return a negative number when no font library is specified in Linux,and this could cause java.lang.ArrayIndexOutOfBoundsException error.So javafx.graphics/com/sun/prism/impl/GlyphCache.java#getCachedGlyph shou check the glyphCode.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run the crash demo

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
i expect show chinese by javafx
ACTUAL -
the error:
java.lang.ArrayIndexOutOfBoundsException: Index -25 out of bounds for length 32 at com.sun.prism.impl.GlyphCache.getCachedGlyph(GlyphCache.java:332) at com.sun.prism.impl.GlyphCache.render(GlyphCache.java:148) at com.sun.prism.impl.ps.BaseShaderGraphics.drawString(BaseShaderGraphics.java:2101) at com.sun.javafx.sg.prism.NGText.renderText(NGText.java:312) at com.sun.javafx.sg.prism.NGText.renderContent2D(NGText.java:270) at com.sun.javafx.sg.prism.NGShape.renderContent(NGShape.java:261) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2072) at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1964) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:270) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:578) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2072) at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1964) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:270) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:578) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2072) at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1964) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:270) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:578) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2072) at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1964) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:270) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:578) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2072) at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1964) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:270) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:578) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2072) at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1964) at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:479) at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:328) at com.sun.javafx.tk.quantum.PresentingPainter.run(PresentingPainter.java:91)

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the crash demo:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class MenuExample extends Application {
    public static void main(String[] args) {
    launch(args);
        }
  
    @Override
    public void start(Stage primaryStage) throws Exception {
        BorderPane root = new BorderPane();
        Scene scene = new Scene(root,200,300);
        MenuBar menubar = new MenuBar();
        Menu FileMenu = new Menu("文本");
        MenuItem filemenu1=new MenuItem("新建");
        MenuItem filemenu2=new MenuItem("Save");
        MenuItem filemenu3=new MenuItem("Exit");
        Menu EditMenu=new Menu("Edit");
        MenuItem EditMenu1=new MenuItem("Cut");
        MenuItem EditMenu2=new MenuItem("Copy");
        MenuItem EditMenu3=new MenuItem("Paste");
        EditMenu.getItems().addAll(EditMenu1,EditMenu2,EditMenu3);
        root.setTop(menubar);
        FileMenu.getItems().addAll(filemenu1,filemenu2,filemenu3);
        menubar.getMenus().addAll(FileMenu,EditMenu);
        primaryStage.setScene(scene);
        primaryStage.setTitle("TEST");
        primaryStage.show();
          
    }
}

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