In this example I am going to show you how we can implement Many to Many(@ManyToMany) relationship using JPA persistence API in Java.
The Java Persistence API (JPA) is a Java specification for accessing, persisting, and managing data between Java objects / classes and a relational database.
The JPA is used to reduce the burden of writing codes for relational object management, a programmer or developer follows the ‘JPA Provider’ framework, which allows easy interaction with database instance. The JPA being a Java framework a programmer also needs not to worry about the SQL part of the code, he/she may need to hardly concentrate on SQL coding.
Many-To-Many relationship is where one or more rows from one entity are associated with more than one rows in another entity.
In this Many to Many mapping example, we have Teacher and Period with multiple relationships.