java.util.Locale is incorrectly deserialized

Name: avC70361 Date: 02/11/98



  The java.util.Locale deserialization is incorrectly performed. This is due to
a chage in Locale code for jdk1.2 and jdk 1.1.6(the field int hashcode made
transient). This change makes the field be set to 0 when the deserialization is
performed. Therefore the hashCode result is also 0. But non-serialized instance
has other hashCode value. So, method equals()(which using hashCode()) returns
false for instances before and after serialization/desarialization.

Here is the test demonstrating the bug.
----------LocaleTest.java----------
import java.util.Locale;
import java.io.IOException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class LocaleTest {

  public static void main(String args[]) {
    Locale locale1 = null;
    Locale locale2 = null;

    ObjectOutputStream ostream = null;
    ByteArrayOutputStream baos = null;
    ObjectInputStream istream = null;

    try {

      ostream = new ObjectOutputStream(
        baos = new ByteArrayOutputStream()
      );

    } catch(IOException e) {
      System.out.println("Unexpected exception : " + e);
      System.exit(1);
    }

    try {

      locale1 = Locale.US;

      ostream.writeObject(locale1);
      ostream.flush();

      byte bytes[] = baos.toByteArray();

      istream = new ObjectInputStream(new ByteArrayInputStream(bytes));
      locale2 = (Locale)istream.readObject();

    } catch(Exception e) {
      System.out.println("Unexpected exception : " + e);
    }

    if (!locale1.equals(locale2)) {
      System.out.println("Locales before and after serialization are not equal\nlocale1 = " + locale1 + "(hash code = " + locale1.hashCode() + ")\nlocale2 = " + locale2 + "(hash code = " + locale2.hashCode() + ")");
    } else {
      System.out.println("OK");
    }
  }

}
-----------------The test output----------
> java LocaleTest
Locales before and after serialization are not equal
locale1 = en_US(hash code = 1591)
locale2 = en_US(hash code = 0)

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