Weightlifting and joint health

Hey Robb or Greg, I was just wondering what think about lifting weights being hazardous to joint, specifically the shoulder joint. Through trial and error I've found that when I lift heavy, regardless of the specific exercise, I seem to always get injured one way or another. However, when I switch to a bodyweight calisthenic-only routine my joints seem to feel better, and actually improve in flexibility and stability. What is your opinion on this type of routine? Do you think someone could get decently strong utilizing only bodyweight?