Avoid misrepresentation.
Off topic, but Jamnia “codified” it by the Jews and for the Jews. The Church was working on the canon of the Old Testament till the African Councils in early 5 c.
Many refer to a Council of Jamnia as authoritatively setting the Hebrew canon around 100 A.D., but modern research no longer considers that to be the case, or that there even was a council, while some scholars argue that the Jewish canon was an achievement of the Hasmonean dynasty (140 and c. 116 B.C.). See http://en.wikipedia.org/wiki/Council_of_Jamnia https://en.wikipedia.org/wiki/Development_of_the_Hebrew_Bible_canon#Council_of_Jamnia
The city of Jamnia had both a rabbinical school (Beth ha- Midrash) and court (Beth Din, Sanhedrin) during the period A.D. 70-135, if not earlier. There is no conclusive evidence for any other rabbinical convocations there...But no text of any specific decision has come down to us (nor, apparently, even to Akiba and his students). Rather, it appears that a general consensus already existed regarding the extent of the category called Scripture, so that even the author of 4 Ezra, though desiring to add one of his own, was obliged to recognize this consensus in his distinction between public and hidden Scripture." — Robert C. Newman, "THE COUNCIL OF JAMNIA AND THE OLD TESTAMENT CANON ," Westminster Theological Journal 38.4 (Spr. 1976) 319-348
However, it is incontrovertible that an authoritative body of wholly inspired Scripture had been established by the time of Christ.