FULL PRODUCT VERSION :
java version "1.5.0_09"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_09-b01)
Java HotSpot(TM) Client VM (build 1.5.0_09-b01), mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

EXTRA RELEVANT SYSTEM CONFIGURATION :
None needed

A DESCRIPTION OF THE PROBLEM :
A and B are both java.util.Date objects, and A.equals(B) != B.equals(A). As quoted from Object.equals.

     * <li>It is <i>symmetric</i>: for any non-null reference values
     * <code>x</code> and <code>y</code>, <code>x.equals(y)</code>
     * should return <code>true</code> if and only if
     * <code>y.equals(x)</code> returns <code>true</code>.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the JUnit Test I've included

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expect this JUnit test to pass, as it should.
ACTUAL -
JUnit test failed because equals within core java classes doesn't really mean equal!!!

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.sql.Timestamp;
import java.util.Date;

import junit.framework.TestCase;

public class SanityTest extends TestCase {

  public void testEqualsReallyDoesMeanEqual() throws Exception {
    Date date = new Date(-62135744400000L);
    POJO pojo = new POJO();
    pojo.setDate(new Timestamp(-62135744400000L));
    
    assertTrue(date.equals(pojo.getDate()));
    assertTrue(pojo.getDate().equals(date));
  }
  
  private class POJO {
    Date date;

    public Date getDate() {
      return date;
    }

    public void setDate(Date date) {
      this.date = date;
    }
  }
}
---------- END SOURCE ----------