FULL PRODUCT VERSION :
java version "1.5.0_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_03-b07)
Java HotSpot(TM) Client VM (build 1.5.0_03-b07, mixed mode, sharing)

java version "1.6.0-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b43)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b43, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Linux localhost.localdomain 2.4.20-8 #1 Thu Mar 13 17:54:28 EST 2003 i686 i686 i386 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
System.nanotTime is documented as indicating time elapsed sinse some *fixed* point. However, under Linux (RedHat 9) it is affected by changes to the system time.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the code below, which displays currentTimeMillis and nanoTime approximately once a second. Change the system clock (e.g. with /sbin/hwclock --date "..." --set; /sbin/hwclock --hctosys).



EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
1121957273144 - 1121957273144598000
1121957274154 - 1121957274154429000
1121957630244 - 1121957275244934000
1121957631254 - 1121957276254933000

ACTUAL -
1121957273144 - 1121957273144598000
1121957274154 - 1121957274154429000
1121957630244 - 1121957630244934000
1121957631254 - 1121957631254933000


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
class ShowTimes {
    public static synchronized void main(String[] args) throws Throwable {
        for (;;) {
            ShowTimes.class.wait(1000);
            System.out.println(
                System.currentTimeMillis() + " - " +
                System.nanoTime()
            );
        }
   }
}
---------- END SOURCE ----------