Name: ooR10001 Date: 07/05/2000


Overloading getTime() method in java.sql.Timestamp class in jdk 1.4 causes
compatibility problem in serialization because writeObject() method in
base class java.util.Date use method getTime() when putting data into a
stream.

In jdk older then 1.4 method getTime is invoked from a superclass of Timestamp,
in jdk 1.4 overloaded method getTime() is invoked and returned value differs
from older jdks.

Due to that, a stream for superclass in jdk1.4 is different from the
corresponding stream in older jdks - it is a compatibility problem. This change
was not approved by the CCC.

getTime() method in jdk 1.4:

public long getTime() {
    long time = super.getTime();
    return (time + (nanos / 1000000));
}
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test example to reproduce a bug:

import java.sql.Timestamp;

class T extends Timestamp {

    T(long t) {
        super(t);
    }

    public long getSuperTime() {
        return getTime() - getNanos() / 1000000;
    }
}

public class t {

  public static void main(String[] args) {
      T stamp = new T(123L);
      if (stamp.getTime() == stamp.getSuperTime()) {
          System.out.println("Test PASSED");
      } else {
          System.out.println("Test FAILED");
      }
  }
}
---------------------------------
Test output:

Test FAILED
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