Yes, if you are a resident of PA then any pension you receive (including NJ Teacher's pension) is taxed by PA.
Effective for retirement income received after December 31, 1995, federal law prohibits any state from taxing certain retirement income (mainly pension income) unless you are resident of, or domiciled in, that state. For example, if you receive a pension from your former California employer and you now reside in New Mexico, California may not tax your retirement income - but New Mexico can.
