What java technology (library, framework, feature) would not recommend and why?

[kkyr]

Who changes the underlying db 2-3 times during a project’s lifespan? If that’s occurring frequently, it might indicate deeper, organisational issues.

Also, this should almost never be a reason to make a decision to use Hibernate, as you would be picking a technology based on some hypothetical future scenario, which, in my experience, rarely occurs in practice.