Foreign key referencing nonprimary key issue with composites ------------------------------------------------------------ Key: HHH-4064 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4064 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.3.1 Reporter: Kaizer The following exception is encountered on trying to map a unidirectional one-to-many mapping with a foreign key referencing a non-primary key. Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145) I was able to proceed by removing the not-null="true" attribute from the <key> element. Forum discussion - https://forum.hibernate.org/viewtopic.php?f=1&t=983396 -- 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