Can not refer to attribute for the target type that has inheritance

Hibernate ORM
1

Hi, I am trying to use EntityGraph to avoid n+1 problem, but currently can not refer to the target property that has inheritance. Here is my entity class definition:

@NamedEntityGraph(
        name = "module.full",
        attributeNodes = {
                @NamedAttributeNode(value = "units", subgraph = "module-unit.full")     
        },
        subgraphs = {
                @NamedSubgraph(
                        name = "module-unit.full",
                        attributeNodes = { @NamedAttributeNode("contents") }
                )
        }
)
public class Module extends AbstractUuidAuditable {

    @Serial
    private static final long serialVersionUID = 1639445282116842021L;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "module", cascade = CascadeType.ALL, orphanRemoval = true)
    private Set<ModuleUnit> units = new HashSet<>();

}

Error is happening with attribute “contents” which defined in class that extends ModuleUnit.

2

Please share the full entity mappings, including this ModeuleUnit class and the entity which defines the contents property. This might be a bug, have you tried with Hibernate’s latest stable version? If you’re still getting an error, please try to create a reproducer with our test case template and if you are able to reproduce the issue, create a new ticket in our issue tracker and attach that reproducer.

3

Hi, sorry for being late. I am currently getting the error with hibernate 6.4.4.Final. Also tried with version 6.6.0.Final - nothing changed.
Here is module unit class definition and class that’s inherit it:

@Entity
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Table(name = "module_unit")
@DiscriminatorColumn(name = "type")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class ModuleUnit extends AbstractUuidAuditable {

    @Serial
    private static final long serialVersionUID = -3729255696302813236L;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "module_id")
    private Module module;

    @Column(name = "type", nullable = false, insertable = false, updatable = false)
    private String type;

    @Column(name = "ordinal_number", nullable = false)
    private Integer ordinalNumber;
}

@Entity
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@DiscriminatorValue(value = "EXTENDER")
public class ModuleUnitExtender extends ModuleUnit {

    @Serial
    private static final long serialVersionUID = -8386189605145250660L;

    @OneToMany(mappedBy = "content", fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true)
    private Set<Content> contents = new HashSet<>()
}
4

I still don’t see the full picture, is the content attribute defined in the AbstractUuidAuditable class?

Also tried with version 6.6.0.Final - nothing changed.

This means there might be a bug in the current version as well. As I suggested previously, please create a reproducer and attach it to a new Jira issue and someone will look into it if possible.

5

Propperty contents is defined in ModuleUnitExtender.class. Ok I will try to create reproducer later