java.lang.IllegalArgumentException: Not a managed type: class com.example.demo.entity.Customer

I tried to add couple of new entity classes in my project, service implementation and repository for those entity. Once after all done I tried to run my application, my IDE show up to below exception to me.

"org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customerRepo' defined in com.example.demo.repo.CustomerRepo defined in @EnableJpaRepositories declared on DemoApplication: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.example.demo.entity.Customer"

Here my Repo and Customer class

public interface CustomerRepo extends JpaRepository<Customer, Integer> {
}

public class Customer {
    private Integer id;
    private String name;
    private String mobile;
    private String email;
}

Its clearly says Customer class is not able to manage by JpaRepository. So JPA not able to consider this Customer class as entity. Because I used Customer class in Repo class as JpaRepository. 

Here the mistake is I forget to change the POJO to Entity. I missed to annotate Customer class with @Entity.

@Entity
@Table(name= "customer", schema = "public")
public class Customer {

So we need to add @Entity annotation to tell jpa this is a entity class to resolve 

this error.

This solve the above exception.