JPA Creating an Entity
A Java class can be easily transformed into an entity. For transformation the basic requirements are: –
- No-argument Constructor
Here, we will learn how to transform a regular Java class into an entity class with the help of an example: –
Simple Student class
Above class is a regular java class having three attributes id, name and fees. To transform this class into an entity add @Entity and @Id annotation in it.
- @Entity – This is a marker annotation which indicates that this class is an entity. This annotation must be placed on the class name.
- @Id – This annotation is placed on a specific field that holds the persistent identifying properties. This field is treated as a primary key in database.
Simple Entity Class