Josephus “Against Apion” Book 1, Chapt. 8.
8. For we have not an innumerable multitude of books among us, disagreeing from and contradicting one another, [as the Greeks have,] but only twenty-two books, (8) which contain the records of all the past times; which are justly believed to be divine; and of them five belong to Moses, which contain his laws and the traditions of the origin of mankind till his death. This interval of time was little short of three thousand years; but as to the time from the death of Moses till the reign of Artaxerxes king of Persia, who reigned after Xerxes, the prophets, who were after Moses, wrote down what was done in their times in thirteen books. The remaining four books contain hymns to God, and precepts for the conduct of human life.
If the Jewish Canon was indeed settled as Josephus says than the "Council of Javneh" (sometimes called "Jamnia"), about A.D. 90 would not have "needed" to establish a Canon which included more than twenty two books.