relation to a subclass doesn't limit query whit type ---------------------------------------------------- Key: EJBTHREE-487 URL: https://jira.jboss.org/jira/browse/EJBTHREE-487 Project: EJB 3.0 Issue Type: Bug Affects Versions: EJB 3.0 RC5 - PFD Environment: JBoss 4.0.4 RC1 not db specific Reporter: Jernej Srebrni? Assignee: Emmanuel Bernard Priority: Critical Attachments: bugClassDiagram.png, BugEntityDiagram.png DB Entiy: table Master (...) table Detail( FK master, type ) Classes: @entity @table(name="Deatail") @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name = "type", discriminatorType = DiscriminatorType.INTEGER) @DiscriminatorValue(value = "0") abstract class AbstracDetail ...{.. @ManyToOne Master getMaster() ..} @entity @DiscriminatorValue(value = "1") abstract class Type1 ...{....} @entity @DiscriminatorValue(value = "2") abstract class Type2 ...{....} @entity class Master{... @OneToMany(mapedBy="master) List<Type1> getType1s() @OneToMany(mapedBy="master) List<Type2> getType2s() ...} Code some where: master.getType1s()... JBoss generated select, whit out type limiting: select ... from Detail where master=?master? Right select: select ... from Detail where master=?master? and type=1 whit code : entityManager.createQuery(" from Type1 t where t.master=:master ")....... the right select is generated. CRITICAL sitiation: insert Type1 and Type2 data for the same master. master.getType1s() or master.getType2s() will fail beacuse hibernate will try to create type1 with type2 data (and vice versa) if relation is set onoToone type cheching is added to the select