I'll use this issue to collect a number of alerts reported by lgtm.com (https://lgtm.com/projects/g/hibernate/hibernate-orm/alerts/). Most of the alerts look well worth fixing and I'll make a start today. However, some of the alerts require deeper knowledge of Hibernate ORM, so I'd like to suggest that someone else takes a look.

In the meantime @sebersole is looking into why automated PR reviews have stopped working after https://github.com/hibernate/hibernate-orm/pull/1887. It appears that one of the github.com/hibernate organization admins introduced restrictions on all types of PR checks across all repositories. To be continued.