Find user by role using spring data jpa

Question

My User Entity

@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @Column(nullable = fals         


        

Answer 1

Here from User to Role is ONE-TO-MANY mapping
i.e list of Roles is an element of User entity, and you are passing a String as List of Roles.
This is the reason you are getting Exception.

Solutions:

• Use findByRolesIn(List roles) instead of findByRoles(String role)

• Or, Make one-to-one mapping as below:

  @Column(nullable = false)
  private String role;
  

• Or, Use JPA Query or Native query as below.

  @Query( "select u from User u  where u.roles in :roles" )
  public List findByRoles(@Param("roles") List roles);