src/share/classes/sun/nio/fs/AbstractFileSystemProvider.java

*** 27,37 ****
  
  import java.nio.file.*;
  import java.nio.file.spi.FileSystemProvider;
  import java.io.IOException;
  import java.util.Map;
- import java.util.Collections;
  
  /**
   * Base implementation class of FileSystemProvider
   */
  
--- 27,36 ----
*** 70,79 ****
--- 69,80 ----
                                     Object value,
                                     LinkOption... options)
          throws IOException
      {
          String[] s = split(attribute);
+         if (s[0].length() == 0)
+             throw new IllegalArgumentException(attribute);
          DynamicFileAttributeView view = getFileAttributeView(file, s[0], options);
          if (view == null)
              throw new UnsupportedOperationException("View '" + s[0] + "' not available");
          view.setAttribute(s[1], value);
      }
*** 81,93 ****
      @Override
      public final Map<String,Object> readAttributes(Path file, String attributes, LinkOption... options)
          throws IOException
      {
          String[] s = split(attributes);
          DynamicFileAttributeView view = getFileAttributeView(file, s[0], options);
          if (view == null)
!             return Collections.emptyMap();
          return view.readAttributes(s[1].split(","));
      }
  
      /**
       * Deletes a file. The {@code failIfNotExists} parameters determines if an
--- 82,96 ----
      @Override
      public final Map<String,Object> readAttributes(Path file, String attributes, LinkOption... options)
          throws IOException
      {
          String[] s = split(attributes);
+         if (s[0].length() == 0)
+             throw new IllegalArgumentException(attributes);
          DynamicFileAttributeView view = getFileAttributeView(file, s[0], options);
          if (view == null)
!             throw new UnsupportedOperationException("View '" + s[0] + "' not available");
          return view.readAttributes(s[1].split(","));
      }
  
      /**
       * Deletes a file. The {@code failIfNotExists} parameters determines if an