Hibernate - annotation mappings and misleading SerializationException

Took me a few hours to get to the bottom of this.
I was getting the following Exception, which did not make sense as the deSerialization test passed OK.
I have a domain object that I had proved through a unit test that I could serialize & deserialize successfully.


My domain object contained the following object which if I removed then worked OK:


But tomcat & my integration test were both failing with the following Exception.


It turns out I had missed out an annotation, obvious really but I could not spot the error & the Exception was totally misleading. What had I missed? The '@manyToOne' annotation. Twit.

hibernate3 - hibernateQueryException - Class is not mapped

I have been having a problem for a while trying to get a basic hibernate3 and Spring 2.5 example working. Using old style hibernate CLASS_NAME.hbm.xml files worked fine. When I changed the context.xml file to try & use annotations instead I got the following error:

Exception in thread "main" org.springframework.orm.hibernate3.HibernateQueryException:
Test is not mapped [from Test t where t.name = ?];
nested exception is org.hibernate.hql.ast.QuerySyntaxException:
Test is not mapped [from Test t where t.name = ?] at
org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:640)

Check the imports of your '@Entity' annotations in your beans

If it is:

    org.hibernate.annotations.Entity;

Then change it to:

    import javax.persistence.Entity;

and life will be sweet.