Definitely a candidate for least needed information in a post 
Anyway my psychic powers tell me you are on a Rpi running Buster and need to review this post. OH4 on buster - Setup, Configuration and Use / Installation - openHAB Community. Or this one Openhabian: Update to OH4 FAILED (fetching Java17) - Setup, Configuration and Use / Installation - openHAB Community
If that is not it, set debugmode=maximum in openhabian.conf