Eager loading @OneToMany class with @EmbeddedId and @DiscriminatorColumn fails ------------------------------------------------------------------------------ Key: HHH-7267 URL: https://hibernate.onjira.com/browse/HHH-7267 Project: Hibernate ORM Issue Type: Bug Components: core Affects Versions: 4.1.2, 3.6.10 Environment: Windows 7 x64 Reporter: Jan Čustović Priority: Critical When I try to load a user which has an owner I get this error. The problem is in @OneToMany userRoles which has @EmbeddedId in combination with @DiscriminatorColumn (if I remove @DiscriminatorColumn it works). Hibernate gets confused because users and users owner userRoles must be loaded. {code:title=Error|borderStyle=solid} 13:00:08.925 [http-bio-8080-exec-1] ERROR org.hibernate.AssertionFailure - HHH000099: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): org.hibernate.AssertionFailure: null identifier 13:00:08.951 [http-bio-8080-exec-1] ERROR com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor - null identifier org.hibernate.AssertionFailure: null identifier at org.hibernate.engine.spi.EntityKey.<init>(EntityKey.java:69) ~[hibernate-core-4.1.2.Final.jar:4.1.2.Final] at org.hibernate.internal.AbstractSessionImpl.generateEntityKey(AbstractSessionImpl.java:242) ~[hibernate-core-4.1.2.Final.jar:4.1.2.Final] at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:722) ~[hibernate-core-4.1.2.Final.jar:4.1.2.Final] at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:635) ~[hibernate-core-4.1.2.Final.jar:4.1.2.Final] at org.hibernate.loader.Loader.doQuery(Loader.java:850) ~[hibernate-core-4.1.2.Final.jar:4.1.2.Final] at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289) ~[hibernate-core-4.1.2.Final.jar:4.1.2.Final] at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) ~[hibernate-core-4.1.2.Final.jar:4.1.2.Final] ... {code} {code:title=User.java|borderStyle=solid} @Entity @Table(name = "user") @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) public class User extends AbstractBaseEntity { @Id @GeneratedValue @Column(name = "id") private Integer id; @ManyToOne(fetch = FetchType.EAGER) @JoinColumn(name = "owner_id", nullable = true) private User owner; @OneToMany(fetch = FetchType.EAGER, mappedBy = "pk.user") private Set<UserRole> userRoles; ... Other fields, getters & setters, hash, equals } {code} {code:title=UserRole.java|borderStyle=solid} @Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name = "type", discriminatorType = DiscriminatorType.STRING) @DiscriminatorValue("DEFAULT") @Table(name = "user_role") public class UserRole implements Serializable { @EmbeddedId private UserRolePK pk; ... Getters & setters, hash, equals } {code} {code:title=UserRolePK.java|borderStyle=solid} @Embeddable public class UserRolePK implements Serializable { @ManyToOne private User user; @ManyToOne private Role role; ... Getters & setters, hash, equals } {code} When I try to change owner to lazy load getOwner() return object with all properties null. {code} ... @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "owner_id", nullable = true) private User owner; ... {code} Changing userRoles to lazy load fixes the problem and everything works good but I need eager load so i added FetchMode.SUBSELECT which also works but I don't want to user hibernate annotations. {code} ... @OneToMany(fetch = FetchType.EAGER, mappedBy = "pk.user") @Fetch(value = FetchMode.SUBSELECT) private Set<UserRole> userRoles; ... {code} -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira