M-; and M-j and c-comment alignment

[Luca Ferrari]

Hi,
I would like my comments to be multi-line as follows:
    /*
     * <here the cursor>
     */
and so a comment decorated with an empty top and bottom line. When I
press M-; emacs correctly opens the comment, and if then I hit M-j
emacs goes down one line and places the '*' for the new line, but this
makes the end of the comment on the last line:
    /*
     * <here the cursor> */

and so I have to manually C-j and indent the last line. Is there a way
to automatically open an aligned comment as the one I would like to
have?

Thanks,
Luca