hibernate cannot handle Inheritance, if the discriminatorColumn is part of a composite pk in a @MappedSupperclass ----------------------------------------------------------------------------------------------------------------- Key: HHH-5308 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5308 Project: Hibernate Core Issue Type: Bug Affects Versions: 3.5.2 Environment: Linux, Java 6 Reporter: AndyW Attachments: jpatest_hibernate_aktuell.zip Hi, i am having the following mapping structure @MappedSuperclass LadeeinheitEinausgaenge | @Entity | @Inheritance(strategy=InheritanceType.SINGLE_TABLE) | @DiscriminatorColumn(name = "LAEA_TYP") | @Table(name = "LADEEINHEIT_EINAUS") +- AbstractEinAusgang | | @DiscriminatorValue("AUSGANG") | | @Entity | +- LadeeinheitAusgaenge | | @DiscriminatorValue("EINGANG") | | @Entity | +- LadeeinheitEingaenge The composite pk is defined in the MappedSuperclass. The discriminator column is part of the composite pk. when i start my app, i am getting the following error: > Repeated column in mapping for entity: de.dbsystel.gate.integration.model.LadeeinheitAusgaenge column: LAEA_TYP (should be mapped with insert="false" update="false") the error message is kind of misleading, because the @DiscriminatorColumn annotation only defines which column to use for the mapping, i guess. however the actual mapping is defined in the MappedSuperclass. When moving the @DiscriminatorColumn to the mappedSuperclass, hibernate does not complain when starting, but then it creates tables, it create the default DiscriminatorColumn named DTYPE, which is not wanted, because i explicitly defined a discriminator column. If the discriminator column is defined in the mappedSuperclass then it will be ignore. if it is defined in my abstract base entity. then i get the error mentioned above. My Intention is to query the AbstractEinAusgang and get one of the two possible concrete classes, that are defined via the discriminator value. i have attached the testcase that shows the problem. cheers, andy