Composition vs. Inheritance with JPA and Hibernate

In today’s video I will compare Composition over Inheritance.
Like all object-oriented programing languages, Java supports the fundamental concepts of inheritance and composition.
There is an important difference between both concepts. Inheritance enables you to model an is-a association between two classes by extending a superclass. Composition models a has-a association by referencing another class in an instance variable.
You can use both concepts with JPA and Hibernate. But when should you use which one and what is the best way to do that?
For plain Java classes, there have been hundreds of discussions about this question. And there is a clear winner.
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[@modraccin9514]

Hi! Thank you for sharing your knowledge. Your statement "Relational databases don't support inheritance" seems to be wrong though. AFAIK PostgreSQL supports inheritance since version 9.4, which was released at the end of 2014.