Name: mgC56079 Date: 10/30/97


The java.text.Collator object serialized under jdk1.1.4 fails to be
deserialized under jdk1.2 due to the incompatibility of the class on
jdk1.1.4 and jdk1.2 platforms.
Reason: the serialVersionUID field is not defined.

==== Here is the test demonstrating the bug (CollatorTest.java) ====
import java.io.*;
import java.text.*;

public class CollatorTest {

  public static void main(String args[]) {

    MyCollator obj;

    String filepath = "RBC.ser";
    if (args[0].equals("write")) {
      obj = new MyCollator();
      ObjectOutputStream stream = null;
      try {
        stream = new ObjectOutputStream(new FileOutputStream(filepath));
        stream.writeObject(obj);
        stream.close();
      } catch(IOException e) {
        System.out.println("Couldn't write to " + filepath + " : " + e);
        System.exit(1);
      }
      System.out.println("written successfully");
    } else if (args[0].equals("read")) {
      ObjectInputStream stream = null;
      try {
        stream = new ObjectInputStream(new FileInputStream(filepath));
        obj = (MyCollator)stream.readObject();
      } catch(InvalidClassException e) {
        System.out.println("Failed:" + e);
        System.exit(1);
      } catch(Exception e) {
        System.out.println(
          "Failed: couldn't read from" + filepath + " : " + e
        );
        System.exit(1);
      }
      System.out.println("Passed");
    }
    System.exit(0);
  }
}


class MyCollator extends Collator {
  public MyCollator() {}
  public int hashCode() {return 0;}
  public int compare(String source, String target) {return 0;}
  public CollationKey getCollationKey(String source) {return null;}
}
----------The test output under jdk1.1.4-----------
#>java BigDecimalTest write
BigDecimal written successfully
#>java BigDecimalTest read
Passed
----------The test output under jdk1.2-------------


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Name: mgC56079 Date: 10/30/97



OOPS! invalid output supplied. The correct one is:
--- jdk1.1.4 ---
% java CollatorTest write
written successfully
% java CollatorTest read
Passed
--- jdk1.2P ---
% java CollatorTest read
Failed:java.io.InvalidClassException: java.text.Collator; Local class not compatible

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