JDK-6939260 : (fs) BasicFileAttributes.lastModifiedTime() should return last modified time with higher precision
- Type: Enhancement
- Component: core-libs
- Sub-Component: java.nio
- Affected Version: 6u15
- Priority: P4
- Status: Closed
- Resolution: Fixed
- OS: linux_ubuntu
- CPU: x86
- Submitted: 2010-03-30
- Updated: 2013-04-12
- Resolved: 2013-01-18
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| JDK 8 |
|---|
8 b75Fixed  |
Description
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 ----------
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