colpitts oscillator with jFET not working
Is transistor modeled in the simulator the 2N3819?

EDIT: https://www.fairchildsemi.com/datasheets/2N/2N3819.pdf

Sorry, for the not-too-insightful initial thoughts on your question.
By the looks of the data sheet above, the transistor you're using operates on much larger voltages than the one in the simulator.