"IllegalArgumentException: Unable to locate Attribute with the the given name [someProperty] on this ManagedType [unknown]" in Hibernate

Issue

• A class hierarchy is defined with a @MappedSuperclass and two or more concrete @Entity annotated types.

  @MappedSuperclass
  public abstract class AbstractEntity<Key extends AbstractKey> implements Serializable {
      @EmbeddedId
      protected Key key;
      ...
  }
  
  @Embeddable
  public class ConcreteKeyOne extends AbstractKey {
      @Column(nullable=false)
      public String one;
      ...
  }
  
  @Embeddable
  public class ConcreteKeyTwo extends AbstractKey {
      @Column(nullable=false)
      public String two;
      ...
  }
  
  @Entity
  public class ConcreteEntityOne extends AbstractEntity<ConcreteKeyOne> {
      ...
  }
  
  
  @Entity
  public class ConcreteEntityTwo extends AbstractEntity<ConcreteKeyTwo> {
      ...
  }
  

• A criteria query is constructed and fails with an IllegalArgumentException when trying to locate the key property

      CriteriaQuery cq = cb.createQuery(ConcreteEntityOne.class);
      Root<ConcreteEntityOne> root = cq.from(ConcreteEntityOne.class);
      Path<ConcreteKeyOne> id = root.get("key");
      Path<String> name = id.get("one"); // fails with java.lang.IllegalArgumentException
      ...
  

• The attempt to create a path to the key property (one) fails with:

  ... java.lang.IllegalArgumentException: Unable to locate Attribute  with the the given name [one] on this ManagedType [unknown]
      at org.hibernate.metamodel.internal.AbstractManagedType.checkNotNull(AbstractManagedType.java:128)
      at org.hibernate.metamodel.internal.AbstractManagedType.getAttribute(AbstractManagedType.java:113)
      at org.hibernate.query.criteria.internal.path.SingularAttributePath.locateAttributeInternal(SingularAttributePath.java:71)
      at org.hibernate.query.criteria.internal.path.AbstractPathImpl.locateAttribute(AbstractPathImpl.java:204)
      at org.hibernate.query.criteria.internal.path.AbstractPathImpl.get(AbstractPathImpl.java:177)
      ...
  

• It appears that the key/ID properties for the last entity processed when the internal metamodel is constructed have overwritten all previous properties (for different key/entity pairs).
• The same code appears to have worked in Hibernate 4 / EAP 6.