src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipFileSystemProvider.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -122,13 +122,10 @@
 
     @Override
     public FileSystem newFileSystem(Path path, Map<String, ?> env)
         throws IOException
     {
-        if (path.getFileSystem() != FileSystems.getDefault()) {
-            throw new UnsupportedOperationException();
-        }
         ensureFile(path);
          try {
              ZipFileSystem zipfs;
              if (env.containsKey("multi-release")) {
                  zipfs = new JarFileSystem(this, path, env);