Andrea Boriero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiODE2N2EwMDgw... ) / Improvement ( https://hibernate.atlassian.net/browse/HHH-16750?atlOrigin=eyJpIjoiODE2N2... ) HHH-16750 ( https://hibernate.atlassian.net/browse/HHH-16750?atlOrigin=eyJpIjoiODE2N2... ) ClassCastException when Entity with a collectionElement has an EmbeddableId reference a class with just one field and Batch is enabled and ( https://hibernate.atlassian.net/browse/HHH-16750?atlOrigin=eyJpIjoiODE2N2... ) Issue Type: Improvement Assignee: Unassigned Created: 05/Jun/2023 07:22 AM Priority: Major Reporter: Andrea Boriero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Given @Entity(name = "EntityA") public static class EntityA { @EmbeddedId private EntityId id; @ElementCollection public Set<EmbeddableA> elementCollection = new HashSet<>(); } @Embeddable public static class EntityId implements Serializable { private String id1; } throws `java.lang.ClassCastException: class org.hibernate.metamodel.mapping.internal.EmbeddedForeignKeyDescriptor cannot be cast to class org.hibernate.metamodel.mapping.internal.SimpleForeignKeyDescriptor` when Batch is enabled. ( https://hibernate.atlassian.net/browse/HHH-16750#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16750#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100225- sha1:4a1ccf9 )