In order to build your repo after new commits, use BitBucket Plugin.
There is just one thing to notice: When creating a POST Hook (notice that it is POST hook, not Jenkins hook), the URL works when it has a "/" in the end. Like:
URL: JENKINS_URL/bitbucket-hook/
e.g. someAddress:8080/bitbucket-hook/
Do not forget to check "Build when a change is pushed to BitBucket" in your job configuration.