select a.value from (select entity_id, min(value) value
from entity_contact where entity_id in (:entityIds)
and contacttype_id =2 group by entity_id) a
group by a.value

@javax.persistence.Entity
@Table(name = "entity_contact")
public class EntityContact {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    private Integer id;

    @ManyToOne (fetch = FetchType.LAZY)
    private Entity entity;
   
    @Column (name = "contacttype_id", nullable = false)
    private int contactTypeId;

    private String value;

    private String description;
.............................