how to use lualatex in emacs org-mode

emacs.el

(add-to-list 'auto-mode-alist '("\\.org$" . org-mode))

(setq org-latex-classes '(("ltjsarticle"
            "\\documentclass{ltjsarticle}
\\usepackage{url}
\\usepackage{amsmath}
\\usepackage{newtxtext,newtxmath}
\\usepackage{graphicx}
\\usepackage{luatexja}
\\usepackage[unicode]{hyperref}
 [NO-DEFAULT-PACKAGES]
 [PACKAGES]
 [EXTRA]"
            ("\\section{%s}" . "\\section*{%s}")
            ("\\subsection{%s}" . "\\subsection*{%s}")
            ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
            ("\\paragraph{%s}" . "\\paragraph*{%s}")
            ("\\subparagraph{%s}" . "\\subparagraph*{%s}"))
               ))

(setq org-latex-pdf-process
      '("latexmk -gg -lualatex %f"
        ))

(setq org-latex-default-class "ltjsarticle")