Here is the full stack trace:

org.hibernate.WrongClassException: Object with id: 1 was not of the specified subclass: org.jbpm.bpel.variable.def.SchemaType (loaded object was of wrong class)
 at org.hibernate.loader.Loader.instanceAlreadyLoaded (Loader.java:1235)
 at org.hibernate.loader.Loader.getRow (Loader.java:1186)
 at org.hibernate.loader.Loader.getRowFromResultSet (Loader.java:569)
 at org.hibernate.loader.Loader.doQuery (Loader.java:689)
 at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections (Loader.java:224)
 at org.hibernate.loader.Loader.loadCollection (Loader.java:1919)
 at org.hibernate.loader.collection.CollectionLoader.initialize (CollectionLoader.java:71)
 at org.hibernate.persister.collection.AbstractCollectionPersister.initialize (AbstractCollectionPersister.java:520)
 at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection (DefaultInitializeCollectionEventListener.java:60)
 at org.hibernate.impl.SessionImpl.initializeCollection (SessionImpl.java:1627)
 at org.hibernate.collection.AbstractPersistentCollection.initialize (AbstractPersistentCollection.java:344)
 at org.hibernate.collection.AbstractPersistentCollection.read (AbstractPersistentCollection.java:86)
 at org.hibernate.collection.PersistentMap.values (PersistentMap.java:198)
 at org.hibernate.type.MapType.getElementsIterator (MapType.java:39)
 at org.hibernate.type.CollectionType.getElementsIterator (CollectionType.java:188)
 at org.hibernate.engine.CascadingAction.getAllElementsIterator (CascadingAction.java:266)
 at org.hibernate.engine.CascadingAction.access$100(CascadingAction.java:21)
 at org.hibernate.engine.CascadingAction$2.getCascadableChildrenIterator(CascadingAction.java:52)
 at org.hibernate.engine.Cascade.cascadeCollectionElements (Cascade.java:288)
 at org.hibernate.engine.Cascade.cascadeCollection (Cascade.java:185)
 at org.hibernate.engine.Cascade.cascadeAssociation (Cascade.java:160)
 at org.hibernate.engine.Cascade.cascadeProperty (Cascade.java:108)
 at org.hibernate.engine.Cascade.cascade (Cascade.java:248)
 at org.hibernate.engine.Cascade.cascade (Cascade.java:223)
 at org.hibernate.event.def.DefaultDeleteEventListener.cascadeBeforeDelete (DefaultDeleteEventListener.java:220)
 at org.hibernate.event.def.DefaultDeleteEventListener.deleteEntity (DefaultDeleteEventListener.java:169)
 at org.hibernate.event.def.DefaultDeleteEventListener.onDelete (DefaultDeleteEventListener.java:110)
 at org.hibernate.impl.SessionImpl.fireDelete (SessionImpl.java:764)
 at org.hibernate.impl.SessionImpl.delete (SessionImpl.java:757)
 at org.hibernate.engine.CascadingAction$2.cascade(CascadingAction.java:47)
 at org.hibernate.engine.Cascade.cascadeToOne (Cascade.java:213)
 at org.hibernate.engine.Cascade.cascadeAssociation (Cascade.java:157)
 at org.hibernate.engine.Cascade.cascadeProperty (Cascade.java:108)
 at org.hibernate.engine.Cascade.cascadeCollectionElements (Cascade.java:290)
 at org.hibernate.engine.Cascade.cascadeCollection (Cascade.java:185)
 at org.hibernate.engine.Cascade.cascadeAssociation (Cascade.java:160)
 at org.hibernate.engine.Cascade.cascadeProperty (Cascade.java:108)
 at org.hibernate.engine.Cascade.cascade (Cascade.java:248)
 at org.hibernate.engine.Cascade.cascade (Cascade.java:223)
 at org.hibernate.event.def.DefaultDeleteEventListener.cascadeBeforeDelete (DefaultDeleteEventListener.java:220)
 at org.hibernate.event.def.DefaultDeleteEventListener.deleteEntity (DefaultDeleteEventListener.java:169)
 at org.hibernate.event.def.DefaultDeleteEventListener.onDelete (DefaultDeleteEventListener.java:110)
 at org.hibernate.impl.SessionImpl.fireDelete (SessionImpl.java:764)
 at org.hibernate.impl.SessionImpl.delete (SessionImpl.java:743)
 at org.jbpm.db.GraphSession.deleteProcessDefinition(GraphSession.java:236)

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