In JPA, we use the @Id annotation to designate a field to be the table’s primary key. The primary key must be a Java primitive type, a primitive wrapper such as Integer or Long, a String, a Date ...

The core idea behind JPA as opposed to JDBC, is that for the most part, JPA lets you avoid the need to “think relationally.” In JPA, you define your persistence rules in the realm of Java code ...

As noted above, JPA is not the only way to persist data in a Java application. Because Java has several implementations of the JPA specification, however, the main advantage of specification is that ...