JPA @ManyToOne map multiple fields pointing the same column

Question

I need to map two fields from an entity (in this example, the entity Colectivo), that reference the same column on the related entity TipoDominio. Is it possible?

Colectivo.java

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({@JoinColumn(name = "TDM_TAC", referencedColumnName = "IDETDM")})
private TiposDominioMantenimiento tdmTac;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumns({@JoinColumn(name = "TDN_ECO", referencedColumnName = "IDETDM")}) 
private TiposDominioMantenimiento tdnEco; 

TipoDominio.java

@Id
@Column(name="IDETDM")
private BigDecimal ideTdm;

If not, how can I specify this? Thanks a lot :)

Answer 1

@JoinColumns should only be used when your related entity has composite/multiple keys.

So as @crizzis mentioned, a single @JoinColumn should be enough for each attribute.

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "TDM_TAC")
private TiposDominioMantenimiento tdmTac;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "TDN_ECO") 
private TiposDominioMantenimiento tdnEco;