Name: avC70361 Date: 06/11/98



  The java.awt.FontMetrics is incorrectly deserialized under jdk1.2beta4 when
has been serialized under jdk1.1.6. Their ascent, descent and some other fields
are different.

  Here is a test demonstrating the bug.
----------FontMetricsTest.java--------
import java.awt.Font;
import java.awt.Panel;
import java.awt.FontMetrics;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class FontMetricsTest {
  public static void main(String[] args) {
    Panel panel = new Panel();
    Font font = new Font("Dialog", Font.PLAIN, 12);
    FontMetrics fm = panel.getFontMetrics(font);

    String fileName = args[1];

    if (args[0].equals("write")) {
      try {
        ObjectOutputStream stream = new ObjectOutputStream(
          new FileOutputStream(fileName)
        );

        stream.writeObject(fm);

        System.out.println("Passed");
      } catch(Exception e) {
        System.out.println("Failed: unexpected exception : " + e);
      }
    } else if (args[0].equals("read")) {
      try {
        ObjectInputStream stream = new ObjectInputStream(
          new FileInputStream(fileName)
        );

        FontMetrics result = (FontMetrics)stream.readObject();

        if (result.getAscent() != fm.getAscent()) {
          System.out.println(
            "Deserialization failed.\n" +
             "Deserialized and expected font metrics have different ascent\n" +
            "deserialized font metrics = " + result + "\n" +
            "expected font metrics = " + fm
          );
        } else {
          System.out.println("Passed");
        }
      } catch(Exception e) {
        System.out.println("Failed: unexpected exception : " + e);
      }
    }

    System.exit(0);
  }
}
---------The test output--------
under jdk1.1.6:
<avv@stardust(pts/3).437> java -version
java version "1.1.6"
<avv@stardust(pts/3).438> java FontMetricsTest write file.ser
Passed
<avv@stardust(pts/3).439> java FontMetricsTest read file.ser
Passed

under jdk1.2beta4:
<avv@stardust(pts/3).442> java -version
java version "1.2beta4"
Classic VM (build JDK-1.2beta4-I, green threads, sunwjit)
<avv@stardust(pts/3).443> java FontMetricsTest read file.ser
Deserialization failed.
Deserialized and expected font metrics have different ascent
deserialized font metrics = sun.awt.motif.X11FontMetrics[font=java.awt.Font[family=Utopia Regular,name=Dialog,style=plain,size=12]ascent=11, descent=2, height=14]
expected font metrics = sun.awt.font.FontDesignMetrics[font=java.awt.Font[family=Utopia Regular,name=Dialog,style=plain,size=12]ascent=9, descent=3, height=13]

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Related to 4150944