The current log4j 3.0 beta builds use Jackson 2.x. My request is that log4j 3.0 development switch to Jackson 3.0 RC builds. This would mean that a final log4j 3.0 would be dependent on a final Jackson 3.0, but it looks like Jackson 3.0 will release first anway.
Jackson 3.0 is a large upgrade from Jackson 2.x. It would seem silly to release a log4j 3.0 later this year still using Jackson 2.x and then be committed to Jackson 2.x for compatibility reasons. It would be nice to start testing log4j 3.0 beta releases with jackson 3.0 and finding any issues sooner rather than later.