"duplicate property mapping" should give more information --------------------------------------------------------- Key: HHH-375 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-375 Project: Hibernate3 Issue Type: Improvement Components: core Environment: Hibernate 3.01, Annotations beta 1 Reporter: Gili Assignee: Diego Pires Plentz I get this exception when initializing AnnotationConfiguration: java.lang.IllegalStateException: org.hibernate.MappingException: duplicate property mapping: type [...] This exception is useless to me because it doesn't tell me which class is improperly annotated and I have many classes. Please include more information with the exception such as the class name and any other information that might help developers track down the problem.