title: Can I mix both update and insert in saveAll from JpaRepository
body: <p>I am using Spring Boot and Spring Data JPA and Hibernate as the persistence provider. I have extended my <code>Repository</code> interface with <code>JPARepository</code>.  I have a list of Entity Bean for a table. Some of them already exist and some of them not. </p>
  
  <p>I want to know what will happen when I call <code>saveAll</code> from my service layer and pass this <code>List</code>?</p>