--- old/src/java.base/share/classes/jdk/internal/jrtfs/JrtFileSystemProvider.java 2016-04-18 10:43:38.595423505 -0700 +++ new/src/java.base/share/classes/jdk/internal/jrtfs/JrtFileSystemProvider.java 2016-04-18 10:43:38.304424758 -0700 @@ -101,10 +101,10 @@ @Override public FileSystem newFileSystem(URI uri, Map env) throws IOException { + Objects.requireNonNull(env); checkPermission(); checkUri(uri); - - if (env != null && env.containsKey("java.home")) { + if (env.containsKey("java.home")) { return newFileSystem((String)env.get("java.home"), uri, env); } else { return new JrtFileSystem(this, env);