Name: sgC58550 Date: 03/17/97


I got a run-time error when trying to print a component that I can
paint just fine. I get the same behavior on both Solaris and Windows 95.

The following is the errors I get on Windows 95. The Solaris messages
are similar.

Exception occurred during event handling:
java.lang.NullPointerException:
        at java.util.Hashtable.get(Hashtable.java:225)
        at sun.awt.windows.WFontMetrics.getFontMetrics(WFontMetrics.java:186)
        at sun.awt.windows.WGraphics.getFontMetrics(WGraphics.java:115)
        at java.awt.Graphics.getFontMetrics(Graphics.java:195)
        at DrawingArea.paint(DrawingArea.java:11)
        at java.awt.Component.print(Component.java:1139)
        at dareout.actionPerformed(dareout.java:41)
        at java.awt.MenuItem.processActionEvent(MenuItem.java:336)
        at java.awt.MenuItem.processEvent(MenuItem.java:307)
        at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:144)
        at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:136)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:60)
 
Here is the abbreviated source code that generated the error. I had these
in two files.

import java.awt.*;
import java.awt.event.*;
import java.util.*;
 
public final class dareout extends Frame implements ActionListener {
 
   private DrawingArea draw_here;
 
public void makeMenuItem (Menu menu, String name) {
   MenuItem mi;
   mi = new MenuItem (name);
   mi.addActionListener (this);
   menu.add (mi);
}
 
public dareout (String ftitle) {
   super(ftitle);
   MenuBar menubar;
   Menu file, actions, display;
   file = new Menu ("File");
   makeMenuItem (file, "Print");
   makeMenuItem (file, "Exit");
   menubar = new MenuBar ();
   setMenuBar (menubar);
   menubar.add (file);
   draw_here = new DrawingArea ();
   add (draw_here);
   setBackground (Color.white);
   pack ();
   setSize (new Dimension (1026, 749));
}
 
public void actionPerformed (ActionEvent e) {
   if (e.getSource() instanceof MenuItem)
      if (e.getActionCommand().equals("Print")) {
         PrintJob pj = getToolkit().getPrintJob (this,
            "Printing Test", (Properties)null);
         if (pj != null) {
            Graphics pg = pj.getGraphics();
            if (pg != null) {
               draw_here.print (pg);
               pg.dispose ();
            }
            pj.end();
         }
      }
      else if (e.getActionCommand().equals("Exit"))
         System.exit (0);
}
public static void main (String[] args) {
   dareout f;
   f = new dareout ("dareout");
   f.show ();
}
}

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
 
public final class DrawingArea extends Canvas {
   float left = 0f, right = 1016f, top = 0f, bottom = 688f;
 
public void paint (Graphics g) {
   int stringwidth, stringheight;
   stringheight = (g.getFontMetrics()).getHeight();
   stringwidth = (g.getFontMetrics()).stringWidth("SAMPLE TITLE")/2;
}
 
}


I tend to suspect there isn't a bug in my code. Since the component
paints ok, I would expect it to print ok.

company - Cummins Engine Company , email - ###@###.###
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