Maps with objects as values cannot be used as keys if the hashcode is lazily loaded. ------------------------------------------------------------------------------------ Key: HHH-6316 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6316 Project: Hibernate Core Issue Type: Bug Affects Versions: 3.6.1 Environment: H2 1.3.153 or MySQL 5.1.x, Linux 2.6.38, Java 1.6.0_24-b07 Reporter: Sumit Raja Priority: Minor Attachments: hibernate-test.tgz When two maps are defined, one containing a type as a value and the other with the same type as key a NPE occurs when doing a get from the type-as-key map, only when the type-as-value map is loaded, but not accessed. The type uses a non-id field for its hash code, which causes the NPE to occur on key insertion. Attached test case probably explains it better. -- 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