The decline of Confucianism in period from 12th century to 16th century in Japan

From the end of 12th century to 16th century,Confucianism was regarded as nothing but a pastime for Japanese noble class.The reasons lie in the two aspects:on the one hand,as the law and code system construction was declared to stop in Japan,Confucianism was no longer adopted as a political weapon;on the other hand,as the historical records Nihon Shoki failed to establish the reputation of Japan overseas,the Japanese aristocrats lost their confidence in Confucianism which had been adopted as a guideline for Japan's invigoration.It was not until the Edo period when Confucianism became popular again.