hibernate inheritance mapping single_table with a property of boolean type

Question

I have this hierarchy for my Entities:

TreeItem
LayerItem extends TreeItem
TypicalItem extends TreeItem

TreeItem:

@Entity
@Table(name = "tree_item")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(
    name = "item_type",
    discriminatorType = DiscriminatorType.STRING
)
@DiscriminatorValue("tree_item")
public class TreeItem implements Serializable {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   @Basic(optional = false)
   private Long id;

   public Long getId() {
     return id;
   }

   public void setId(Long id) {
     this.id = id;
   }
   ........
}

The inheritance type is SINGLE_TABLE.
LayerItem has a property `enabled' of boolean type.

LayerItem:

 @Entity
@DiscriminatorValue("layer_item")
public class LayerItem extends TreeItem {

   @Column(nullable = true)
   private boolean enabled = false;

   @Column
   private String position;

   @PrePersist
   public void prePersist() {
       if (JUtil.isEmpty(this.enabled)) //We set default value in case if the value is not set yet.
       {
          this.enabled = false;
       }
   }
}

The problem is that when I want to persist a TypicalItem (taht does not have the enabled property) I face this error:

org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of my.app.entity.LayerItem.enabled

I've set a default value (false) for it, but it has no effect.

Answer 1

a primitve boolean can not be null. So you have to change it to a Boolean object or make it not nullable:

   @Column(nullable = true)
   private Boolean enabled = false;

Or

   @Column(nullable = false)
   private boolean enabled = false;