FULL PRODUCT VERSION :
java version "1.6.0_15"
Java(TM) SE Runtime Environment (build 1.6.0_15-b03)
Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux universe 2.6.31-20-generic #58-Ubuntu SMP Fri Mar 12 04:38:19 UTC 2010 x86_64 GNU/Linux


EXTRA RELEVANT SYSTEM CONFIGURATION :
ext4 hard disk partition


A DESCRIPTION OF THE PROBLEM :
incorrect precision of lastModified() of java.io.File on Ubuntu x64 Linux

According to https://ext4.wiki.kernel.org/index.php/Ext4_Howto#Inode-related_features

ext4 support time precision up to nanosecond

According to http://java.sun.com/javase/6/docs/api/java/io/File.html#lastModified%28%29

the lastModified() function support resolution up to microsecond.

In fact, the function also return '000' at the end of number, which is inaccurate

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
list a directory by the following shell command (will show the full timestamp)

ls -la --full-time /

write a simple java program to display the lastModified time of any file

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
lastModified time up to microseconds should be shown
ACTUAL -
The end of the number is always 000, which is inaccurate

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.io.*;

public class test {

    public static void main(String[] args) throws Throwable {
        String path="/etc/fstab";
        System.out.println("File: "+path+" , last modified: "+Long.toString(new java.io.File(path).lastModified()));
    }

}
---------- END SOURCE ----------