Hibernate 5 has updated dialects for various databases, and MySQL 8 has a special one of its own. Here's an example hibernate.cfg.xml for MySQL 8 for Hibernate 5 apps or newer.

Hibernate MySQL persistence XML file As MySQL installations continue to migrate and evolve to newer versions, the online JPA and Hibernate 5 tutorials haven’t kept up with quite as much vigor. As a ...

With Oracle acquiring Sun Microsystems, it also acquires MySQL, the poster child for open-source applications. (Not to mention Solaris, which Sun says is a larger Linux distribution than Red Hat.

Sun Microsystems has acquired them instead, for $1 billion. MySQL had raised a total of $39 million from Benchmark, Index, IVP, Intel, and SAP.