JPA Many-To-Many Mapping
We have to create Many-To-Many relationship between the Departments and the Employees, in such a way that one employee can work many department and one department can have many employees.
As we know, in RDBMSs we can create relationships with foreign keys. Since both sides should be able to reference the other, we need to create a separate table to hold the foreign keys:
Employee entity class:
To configure the relationship type we mark the collection with @ManyToMany annotation
Department entity class :
On the targeted side we only have to provide the name of the field,which maps the relationship.
EmployeeServiceImpl class :
To save the department list
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