Isn't Hibernate still the default ORM in the Spring community? If so, what's changed? Hibernate is a monstrosity. Then again, so is Java so I'm still scratching

Isn't Hibernate still the default ORM in the Spring community? If so, what's changed? Hibernate is a monstrosity. Then again, so is Java so I'm still scratching my head trying to understand how anyone is jumping ship from Rails to Spring when Rails was originally an oasis for Java refugees.