Hibernate - mappedBy reference an unknown target entity property

Question

I'm developing an application in Java with Hibernate. I'm having trouble with relationships.

Class Nucleo

@Entity
@Table(name = "nucleo")
public class Nucleo {

    @Id
    @GeneratedValue
    @Column(name = "nuc_id")
    private Integer id;
    @Column(name = "nuc_nome")
    private String nome;
    @DateTimeFormat(pattern = "dd/MM/yyyy")
    @Column(name = "nuc_data_criacao")
    private Calendar dataCriacao;
    @OneToMany(cascade = CascadeType.ALL)
    @JoinColumn(name = "nuc_id")
    private List<Telefone> telefone;
    @OneToMany(targetEntity = Pessoa.class, mappedBy="nucleo", fetch = FetchType.LAZY)
    private List<Pessoa> funcionarios;

Class Pessoa

@Entity
@Table(name = "pessoa")
public class Pessoa {

    @Id
    @GeneratedValue
    @Column(name = "pes_id")
    private Integer id;
    @Column(name = "pes_nome")
    private String nome;
    @Column(name = "pes_observacao")
    private String observacao;
    @ManyToOne
    @JoinTable(
        name = "trabalha",
        joinColumns = @JoinColumn(name = "pes_id"),
        inverseJoinColumns = @JoinColumn(name = "nuc_id")
    )
    private Nucleo nucleo;

It happens the following problem:

org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: br.edu.esaoabsp.sistemas.model.Pessoa.nucleo in br.edu.esaoabsp.sistemas.model.Nucleo.funcionarios
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:769)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:729)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:70)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1697)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1426)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1846)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:857)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:425)

The nucleo attribute exists in the class Pessoa. Why I'm getting this error?

Possible to just try to try a simplest example and make it works (bi-dir relationship using a join table)? I don't see the need of using `targetEntity` there. Can try to remove it and have a try agian? — Adrian Shum, Jun 15 '16 at 01:37
@AdrianShum I removed the `targetEntity` and I get the same error. — Thiago Gomes, Jun 15 '16 at 15:02
@KenChan I'm using @Entity. Is it necessary to define `Nucleo` in `persistence.xml`? — Thiago Gomes, Jun 15 '16 at 15:05
depend on your application environment . In Java SE environment , yes. In Java EE , it may not required. — Ken Chan, Jun 15 '16 at 15:10
@ThiagoGomes it is (kind of) required to be in persistence.xml no matter it is SE or EE. It is the way to tell JPA what are the entities. However, depending on technologies you are using, there are other alternatives, which I have answered some similar question long time ago: http://stackoverflow.com/a/13756652/395202 — Adrian Shum, Jun 16 '16 at 03:28
Just wonder, assuming you do not have that bi-dir relationship (just to make thing simple), do both entities work (so you can read/update)? — Adrian Shum, Jun 17 '16 at 03:06
@AdrianShum When I removed the relationship, the entities work fine. — Thiago Gomes, Jun 17 '16 at 11:14
just wonder... why you would have a JoinTable for One-to-Many relationship? Shouldn't a One-To-Many relationship normally be modeled as FK at the "Many" side table? — Adrian Shum, Jun 20 '16 at 01:33

Hibernate - mappedBy reference an unknown target entity property

0 Answers0