Failed to convert property value of type 'java.lang.Integer' for property - spring-boot

Question

I am trying to persist a class with .save method of a #Repository or #RepositoryRestResource using springboot (both case its happening the same...)
my repo:
/**
* Repository interface to do queries for UserBackoffice data.
*/
#RepositoryRestResource(path = "userBackoffice")
public interface UserBackofficeRepository
extends PagingAndSortingRepository<UserBackoffice, UserBackofficeId> {
}
my entity is this class:
/**
* DAO for UserBackoffice table in Database.
*/
#Data
#NoArgsConstructor
#AllArgsConstructor
#JsonInclude(Include.NON_NULL)
#Entity
#Table(uniqueConstraints = {#UniqueConstraint(name = "unq_user_id_constraint_01",
columnNames = {"user_id", "core_user_id", "backoffice_id"})})
#IdClass(UserBackofficeId.class)
public class UserBackoffice implements Serializable {
/**
* serial version.
*/
private static final long serialVersionUID = 1L;
/**
* user associated to the backoffice identifier.
*/
#Id
#ToString.Exclude
#EqualsAndHashCode.Exclude
#JsonBackReference(value = "user")
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "user_id")
private User user;
/**
* Backoffice Id.
*/
#Id
#ToString.Exclude
#EqualsAndHashCode.Exclude
#JsonBackReference(value = "backofficeId")
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "backoffice_id")
private Backoffice backofficeId;
/**
* Core user identifier update from Backoffice.
*/
#Column(name = "core_user_id")
private String coreUserId;
}
/**
* Artificial class to support product backoffice composite key.
*/
#Data
#NoArgsConstructor
#AllArgsConstructor
public class UserBackofficeId implements Serializable {
/**
* serial version.
*/
private static final long serialVersionUID = 1L;
/**
* user associated to the backoffice identifier.
*/
private User user;
/**
* Backoffice Id.
*/
private Backoffice backofficeId;
}
/**
* DAO for backoffice table in Database.
*/
#Data
#Builder
#NoArgsConstructor
#AllArgsConstructor
#JsonInclude(Include.NON_NULL)
#Entity(name = "backoffice")
public class Backoffice implements Serializable {
/**
* serial version.
*/
private static final long serialVersionUID = 9077401445066055280L;
/**
* backoffice Id.
*/
#Id
#Column(name = "id")
private Integer id;
/**
* backoffice name.
*/
#NotEmpty
#Size(max = 100)
#Column(name = "name")
private String name;
/**
* list of user backoffice.
*/
#LazyCollection(LazyCollectionOption.TRUE)
// #JsonManagedReference
#OneToMany(cascade = CascadeType.ALL, targetEntity = UserBackoffice.class,
mappedBy = "backofficeId")
private List<UserBackoffice> userBackoffice;
}
when i try to do a simple test like this:
#Test
void saveUserBackOffice() throws StreamReadException, DatabindException, IOException {
PodamFactory factory = new PodamFactoryImpl(); //factory for dummy objects
User user = factory.manufacturePojo(User.class);//create a dummy user
Backoffice backoffice = factory.manufacturePojo(Backoffice.class); //create a dummy backoffice
UserBackoffice userbackoffice = new UserBackoffice(user, backoffice, "01");
UserBackoffice backofficeResponseAfterSave = userBackRepo.save(userbackoffice);
assertEquals(userbackoffice, backofficeResponseAfterSave);
}
i get this error message when save execute and the transaction is rollbacked:
"Failed to convert property value of type 'java.lang.Integer' to required type 'es.kukenbank.microservice.crypto.repository.entity.Backoffice' for property 'backofficeId'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.Integer' to required type 'es.kukenbank.microservice.crypto.repository.entity.Backoffice' for property 'backofficeId': no matching editors or conversion strategy found"
i really dont see what is happening because user and backoffice dummy object have value according his atribute types correctly.