Jiga

This is the stack trace for this error:

org.hibernate.HibernateException: Encountered problem trying to hydrate identifier for entity [SingleTableEntityPersister(YourEntity)]
    at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.readIdentifierHydratedState(EntityReferenceInitializerImpl.java:116)
    at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.hydrateIdentifier(EntityReferenceInitializerImpl.java:85)
    at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.readRow(AbstractRowReader.java:68)
    at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractRows(ResultSetProcessorImpl.java:157)
    at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:94)
    at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:105)
    at org.hibernate.loader.collection.plan.AbstractLoadPlanBasedCollectionInitializer.initialize(AbstractLoadPlanBasedCollectionInitializer.java:87)
    at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:705)
    at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:76)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107)
    at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:2208)
    at org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(AbstractPersistentCollection.java:595)
    at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:264)
    at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:591)
    at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:149)
    at org.hibernate.collection.internal.PersistentBag.iterator(PersistentBag.java:387)

You may get this error if the data type defined on the database table is different from the one defined in Hibernate/Java code. To fix this, make sure they are both of the same types.

This can also happen when you are storing an invalid value in the DB table and trying to read it. Eg. storing a non-UUID value in a char(36) field in MySQL and trying to read it as UUID type in code.

Thanks to https://cursos.alura.com.br/forum/topico-problemas-ao-hydratar-identifier-para-entidade-178306 for providing a solution. This error didn’t return much results in Google search.