Jōjitsu school 

One of the Six Schools of Nara Buddhism that flourished under government patronage during the early period of Japanese Buddhism. This school took as its focus the Satyasiddhi Śāstra written by the Indian sage Harivarman during the 3rd century. This text's teachings were Sautrantika in form and very similar to those of the Madhyamaka school, which was represented in Japan at the time by the Sanron school, and the Jōjitsu school later became identified with it. Harivarman had sought to establish the emptiness of both persons and phenomena by analysing both into smaller and smaller building blocks, until at the end nothing could be found.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)