Japan is now in a trap - they want to go from deflation to moderate inflation to boost economic growth but won't be able to handle the dept if cost of borrowing

Japan is now in a trap - they want to go from deflation to moderate inflation to boost economic growth but won't be able to handle the dept if cost of borrowing money raises. Also their demographics situation is one of the worst in the world - if they don't repay the debts now how will they do it when number of people in production age drops.