Hibernate: org.hibernate.WrongClassException … instanceAlreadyLoaded
May 4th, 2009 by jeremychoneHibernate inheritance and relationship could lead to the following exception:
Caused by: org.hibernate.WrongClassException: Object with id: 3 was not of the
specified subclass...
...
at org.hibernate.loader.Loader.instanceAlreadyLoaded(Loader.java:1267)
at org.hibernate.loader.Loader.getRow(Loader.java:1219)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:603)
at org.hibernate.loader.Loader.doQuery(Loader.java:724)
...
Putting @ForceDiscriminator near the @DiscriminatorValue(..) of your respective classes might solve the problem.
See Hibernate Annotation Doc