Name: ooR10001 Date: 04/23/2001


Method readObject() in java.awt.ScrollPane incorrectly deserializes object
from a stream made under previous version of JDK. This is a compatibility
problem.

Following test shows this bug:

This code should be executed under jdk1.3. It makes a stream with serialized
instance of java.awt.ScrollPane.
-----------------
import java.awt.ScrollPane;

public class t {

  public static void main(String[] args) {
      try {
          java.io.FileOutputStream fos =
                  new java.io.FileOutputStream("test.ser");
          java.io.ObjectOutputStream oos = new java.io.ObjectOutputStream(fos);
          ScrollPane ex = new ScrollPane(ScrollPane.SCROLLBARS_ALWAYS);
          System.out.println("To stream: " + ex.getScrollbarDisplayPolicy());
          oos.writeObject(ex);
          oos.close();
          fos.close();
      } catch (java.io.IOException e) {
          e.printStackTrace();
      }
}
-----------------

Output: (shows value of scrollbarDisplayPolicy)
----------------
To stream: 1
----------------

Following code should be exucuted under jdk1.4. It is deserialize an object from
a stream and shows deserialized scrollbarDisplayPolicy.

---------------------
public class t {

  public static void main(String[] args) {
      try {
          java.io.FileInputStream fis =
                  new java.io.FileInputStream("test.ser");
          java.io.ObjectInputStream ois = new java.io.ObjectInputStream(fis);
          ScrollPane x = (ScrollPane)ois.readObject();
          System.out.println("From stream: " + x.getScrollbarDisplayPolicy());
          ois.close();
          fis.close();
      } catch (ClassNotFoundException e) {
          e.printStackTrace();
      } catch (java.io.IOException e) {
          e.printStackTrace();
      }
 }
---------------------

Output:
-------------------
>From stream: 0
-------------------


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