For me the /**<NEWLINE> or Shift–Alt–J (or ⌘–⌥–J on a Mac) approach works best.
I dislike seeing Javadoc comments in source code that have been auto-generated and have not been updated with real content. As far as I am concerned, such javadocs are nothing more than a waste of screen space.
IMO, it is much much better to generate the Javadoc comment skeletons one by one as you are about to fill in the details.