What's new in JPA 2.2?

For those who are familiar with JPA, let's first introduce the new features provided by JPA 2.2:

• Stream query results
• Repeatable annotations
• Java 8 date and time support
• CDI support in converters

Architecture

The Java persistence API is built around the following components:

• Persistence provider: A persistence provider is a JPA implementation provided by a vendor. As with most Java APIs, JPA is a standard API, where a set of different actual implementations are available from different vendors. The persistence provider means the vendor of the actual implementation we are using.
• Entities: An entity is a class that represents a domain object in our enterprise application. From a JPA perspective...