Your beetle is a female of the genus Gnoma, possibly atomaria or longicollis (both described from India). They are separable through the frontal puncturing of the head. Have you taken other pictures?
Wow! The puncturing is coarse; thus, Gnoma atomaria Guérin de Méneville, 1834.
This species was originally described from India, but Breuning considered this locality as erroneous (without furnish reasons - and indicated Java as homeland.