src/java.base/share/classes/jdk/internal/jrtfs/JrtFileSystemProvider.java

*** 99,112 ****
      }
  
      @Override
      public FileSystem newFileSystem(URI uri, Map<String, ?> env)
              throws IOException {
          checkPermission();
          checkUri(uri);
! 
!         if (env != null && env.containsKey("java.home")) {
              return newFileSystem((String)env.get("java.home"), uri, env);
          } else {
              return new JrtFileSystem(this, env);
          }
      }
--- 99,112 ----
      }
  
      @Override
      public FileSystem newFileSystem(URI uri, Map<String, ?> env)
              throws IOException {
+         Objects.requireNonNull(env);
          checkPermission();
          checkUri(uri);
!         if (env.containsKey("java.home")) {
              return newFileSystem((String)env.get("java.home"), uri, env);
          } else {
              return new JrtFileSystem(this, env);
          }
      }