InheritanceType.TABLE_PER_CLASS crashs when the primary classes have properties with the same name and different values ONLY USING JTA PERSISTENT-UNIT ------------------------------------------------------------------------------------------------------------------------------------------------------ Key: HHH-5587 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5587 Project: Hibernate Core Issue Type: Bug Components: core, entity-manager Affects Versions: 3.5.6 Environment: Postgre 8.4, Hibernate 3.5.6-Final, Maven 2, Glassfish 3.01, JPA 2.0, EJB 3.1 Reporter: Mauricio Chamati I am trying to retrieve a list of Products (Entity). Each product has a list of a pair Attribute/Value mapped as follows: @OneToMany(cascade = javax.persistence.CascadeType.ALL, mappedBy="product", fetch=FetchType.EAGER) @MapKey(name="attribute") private Map<Attribute, Value<?>> attributes = new HashMap<Attribute, Value<?>>(); As this value can be of many types, I used "InheritanceType.TABLE_PER_CLASS" in the "Value.class". Everything runs OK for LOCAL_RESOURCE persistent-unit. But, running into the container using JTA that does not work. It gives the database error: "UNION types x and y cannot be matched." (being x and y types like numeric or date). The generated query for JTA is something like this (I shorten it): select * from ( select id, attribute, product, value from value_datetime union all select id, attribute, product, value from value_decimal union all select id, attribute, product, value from value_integer ) attributes where product = ? And of course, the values won't match. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira