@Entity
@Table(name = "myapp_component")
@Inheritance(strategy = InheritanceType.JOINED)
public class Component extends BaseEntity {

   @Column(name = "attribute_name", nullable = true, length = 128)
   private String attributeName;

   @ManyToOne(cascade = CascadeType.ALL, optional = true)
   @JoinColumn(name = "parent_id", nullable = true)
   private Component parent;

   @OneToMany(mappedBy = "parent")
   @MapKey(name = "attributeName")
   private Map<String, Component> children;

        // ... getters and setters ....
}

Hibernate:
    select
        component0_.id as id1_1_,
        component0_.uid as uid1_1_,
        component0_.version as version1_1_,
        component0_.attribute_name as attribute4_1_1_,
        component0_.parent_id as parent5_1_1_,
        component0_.template_instance_id as template6_1_1_,
        component0_1_.image_id as image2_2_1_,
        component0_2_.text_value as text1_3_1_,
        case
            when component0_1_.component_id is not null then 1
            when component0_2_.component_id is not null then 2
            when component0_.id is not null then 0
        end as clazz_1_,
        children1_.parent_id as parent5_1_3_,
        children1_.id as id3_,
        children1_.attribute_name as formula0_3_,
        children1_.id as id1_0_,
        children1_.uid as uid1_0_,
        children1_.version as version1_0_,
        children1_.attribute_name as attribute4_1_0_,
        children1_.parent_id as parent5_1_0_,
        children1_.template_instance_id as template6_1_0_,
        children1_1_.image_id as image2_2_0_,
        children1_2_.text_value as text1_3_0_,
        case
            when children1_1_.component_id is not null then 1
            when children1_2_.component_id is not null then 2
            when children1_.id is not null then 0
        end as clazz_0_
    from
        myapp_component component0_
    left outer join
        myapp_component_image component0_1_
            on component0_.id=component0_1_.component_id
    left outer join
        myapp_component_text component0_2_
            on component0_.id=component0_2_.component_id
    left outer join
        myapp_component children1_
            on component0_.id=children1_.parent_id
    left outer join
        myapp_component_image children1_1_
            on children1_.id=children1_1_.component_id
    left outer join
        myapp_component_text children1_2_
            on children1_.id=children1_2_.component_id
    where
        component0_.id=?

Hibernate:
    select
        children0_.parent_id as parent5_1_1_,
        children0_.id as id1_,
        children0_.attribute_name as formula0_1_,
        children0_.id as id1_0_,
        children0_.uid as uid1_0_,
        children0_.version as version1_0_,
        children0_.attribute_name as attribute4_1_0_,
        children0_.parent_id as parent5_1_0_,
        children0_.template_instance_id as template6_1_0_,
        children0_1_.image_id as image2_2_0_,
        children0_2_.text_value as text1_3_0_,
        case
            when children0_1_.component_id is not null then 1
            when children0_2_.component_id is not null then 2
            when children0_.id is not null then 0
        end as clazz_0_
    from
        myapp_component children0_
    left outer join
        myapp_component_image children0_1_
            on children0_.id=children0_1_.component_id
    left outer join
        myapp_component_text children0_2_
            on children0_.id=children0_2_.component_id
    where
        children0_.parent_id=?