FULL PRODUCT VERSION :
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux jatin 3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:00:20 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
Calling register method on java.nio.file.Path object clears the interrupt status of the thread.

i.e. if `Thread.currentThread().isInterrupted()` returns true. After calling `path.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY)`, doing `Thread.currentThread().isInterrupted()` returns false

ADDITIONAL REGRESSION INFORMATION:
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) Interrupt a thread
2) Check the interrupt status of thread to be true
3) Let the thread register a file with the watcher service by doing say: dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY);
4) Check the interrupt status of thread again.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Interrupt status after calling `Path#register` should be the same as it was before calling it
ACTUAL -
Interrupt status was cleared

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import java.io.*;
import java.nio.file.*;
import static java.nio.file.LinkOption.*;
import static java.nio.file.StandardWatchEventKinds.*;
import java.nio.file.attribute.*;


public class WatchDir {

private final WatchService watcher;


private void register(Path dir) throws IOException {
    //interrupt itself
    Thread.currentThread().interrupt();
    boolean before = Thread.currentThread().isInterrupted();
    WatchKey key = dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY);
    boolean after = Thread.currentThread().isInterrupted();

    if(before){
        if(!after){
            System.out.println("--------------------BUG-------------------");
            System.out.format("Interrupt Status: true before making call to Path#register for folder folder: %s\n", dir);
            System.out.format("Interrupt Status: false after making call to Path#register for folder folder: %s\n", dir);
            System.out.println("The interrupt status was cleared by `register` (Unexpected Behavior).");
            System.exit(0);
        }else{
            System.out.println("Not a bug on your machine. The interrupt was not cleared after call to Path#register. Works as expected");
            System.out.println("Works well on your machine. Didn't work for me on Windows and Ubuntu with Java 7");
        }
    }
}

/**
 * Creates a WatchService and registers the given directory
 */
WatchDir(Path dir) throws IOException {
    this.watcher = FileSystems.getDefault().newWatchService();
    register(dir);
}


public static void main(String[] args) throws Exception {
    // register directory and process its events
    Path dir = Paths.get(".");
    new WatchDir(dir);
}}

---------- END SOURCE ----------

SUPPORT :
YES