[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1657?page=c... ] Erwin Bolwidt commented on HHH-1657: ------------------------------------ Some more detail. Say there are two classes: @Entity @Inheritance(strategy = InheritanceType.JOINED) public class A { private Long id; // getter and setter } @Entity public class B extends A { private String name; // getter and setter } This bulk update query will fail: UPDATE B SET name = 'foobar' WHERE id = ? with the message "ERROR: column reference "id" is ambiguous" (on Postgresql but the error is not dialect-specific as far as I can see) The sql that it fails on would be: insert into HT_b select b0_.id as id from b b0_ inner join a b0_1_ on b0_.id=b0_1_.id where id=? the last part should have been "where b0_.id = ? " -- 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