FULL PRODUCT VERSION :
java version "1.8.0_66"
Java(TM) SE Runtime Environment (build 1.8.0_66-b18)
Java HotSpot(TM) 64-Bit Server VM (build 25.66-b18, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
The java.nio.file package documentation states: "Unless otherwise noted, invoking a method of any class or interface in this package created by one provider with a parameter that is an object created by another provider, will throw ProviderMismatchException."

However, this is not always the case for Paths of the zipfs FileSystem, namely when invoking register() with a WatchService that was created by another provider. In this case, it throws an UnsupportedOperationException instead.

Please see below for a test case.

I think the fix is as simple as replacing UnsupportedOperationException with ProviderMismatchException on the following line:
http://hg.openjdk.java.net/jdk9/dev/jdk/file/tip/src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipPath.java#l572


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
- create a .zip file
- make sure the test case finds the .zip file at the expected location
- run the test case


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
a ProviderMismatchException is thrown
ACTUAL -
an UnsupportedOperationException is thrown

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardWatchEventKinds;

public class ZipIssue {

public static void main(String[] args) throws IOException {
Path zip = Paths.get("archive.zip");
Path root = FileSystems.newFileSystem(zip, null).getPath("/");
root.register(FileSystems.getDefault().newWatchService(), StandardWatchEventKinds.ENTRY_CREATE);
}

}

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