How to inject EntityManager in EntityListeners

Question

I need to inject EntityManager in EntityListener class so that I can perform CRUD operation on it.

POJO:

@Entity
@EntityListner(AuditLogging.class)
c         


        

Answer 1

Well, the first solution which came into my mind is a little "hack", but should work.

    public class AuditInterceptor {

        static setEntityManager emf; 

        @Autowired
        public void setEntityManagerFactory(EntityManager emf) {
            AuditInterceptor.emf = emf;
        }

        @PrePersist
        public void prePersist(Object obj) { 
            EntityManager entityManager = emf.getEntityManager();
            // Here I want to use ENTITY manager object so that I can perform CRUD operation
            // with prePersist coming object.

            entityManager.unwrap(Session.class).save(obj);

            // But I am getting NULL POINTER EXCEPTION for entity manager object 
       }
   }

Inside of your code use EntityManager entityManager = emf.getEntityManager()

Declare your AuditInterceptor as a spring bean (@Component with component-scan or define AuditorInterceptor as a bean)