About Hibernate

Do you need everything in the required folder for now?

That's right.

I think the document is deployed in the documentation directory.
The same thing can be found on the web, but
Quickstart's 1.2.Release Bundle Downloads section describes it.

The lib/required/directory contains the hibernate-core jar and all of its dependencies. All of these jars are required to be available on your classpath no matter which features of Hibernate are being used.

Many Japanese websites on the Internet have older versions

Recently, I use build management tools such as Maven and Gradle, so I think the reason why I'm not aware of the dependency libraries (jar files) that I need is because of the old explanation.