code: public Attributes getAttributes() throws IOException {
          JarEntry e = getJarEntry();
          return e != null ? e.getAttributes() : null;
      }
docs: Return the Attributes object for this connection if the URL
  for it points to a JAR file entry, null otherwise.
  
  @return the Attributes object for this connection if the URL
  for it points to a JAR file entry, null otherwise.
  
  @exception IOException if getting the JAR entry causes an
  IOException to be thrown.
  
  @see #getJarEntry