FULL PRODUCT VERSION :
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b134)
Java HotSpot(TM) Client VM (build 21.0-b04, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows 7 Professional Version 6.1(Build 7601:Service Pack 1)

A DESCRIPTION OF THE PROBLEM :
The createFile() method in the Files class throws NoSuchFileException if the file already exists. I think this should be FileAlreadyExistsException. This is not mentioned in the documentation for b134.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute the method to create a file twice.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
FileAlreadyExistsException thrown.
ACTUAL -
NoSuchFileException is thrown.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class Test {
  public static void main(String[] args) {
    FileSystem fileSystem = FileSystems.getDefault();
    Path path = Paths.get("C:/Garbage/dir/dir1/dir2/junk.txt");
    try {
      Files.createDirectories(path.getParent());
      Files.createFile(path);
      Files.createFile(path);
    } catch(NoSuchFileException e) {
      System.err.println("File not created.\n" + e);
    } catch(FileAlreadyExistsException e) {
      System.err.println("File not created.\n" + e);
    } catch(IOException e) {
      System.err.println(e);
    }
  }
}

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