Jamieson, Fausset and Brown on 2 Kings 24:6

6. Jehoiakim slept with his fathers--This phraseology can mean nothing more than that he died; for he was not buried with his royal ancestors; and whether he fell in battle, or his body was subjected to posthumous insults, he was, according to the prediction (Jr 22:19), not honored with the rites of sepulture (Jr 36:30).

Jehoiachin his son reigned in his stead--The very brief reign of this prince, which lasted only three months, during which he was a humble vassal of the Assyrians, is scarcely deserving to be taken into account, and therefore is in no way contradictory to the prophetic menace denounced against his father (Jr 36:30).