Dreaming about eating jam signifies that you are feeling stressed about some small problem in your life. When you are in a bind for time, you might make excuses about not being able to complete a job or something. It’s possible that this is what causes you to become annoyed and work yourself up into a stressful situation.
Having jam in a dream means being stuck, and maybe even ultimately reaching an stagnant state of mind, where seemingly tiny problems get inflated to the point of being unbearable, forcing one to focus on distractions or excessive unproductive busywork.