JAL mainline does not hire foreign pilots, only Japanese nationals. The only way to join the JAL group is through JALWays and on contract basis only on 747 classic series aircraft. If you are interested check out WASINC or PARC aviation. These crew leasing websites will list minimum requirements. I believe the minimums are in the range of 2500 Hours and an ATPL, as well as being in a physical shape that would deem you capabale to win the Tour De France on any given day.(Very Very strict medical)
Good luck.