[hibernate-issues] [Hibernate-JIRA] Created: (HHH-7216) "java.lang.IllegalStateException: No supertype found" thrown on query with "COUNT" aggregate function

[Tomas Milo (JIRA)]

"java.lang.IllegalStateException: No supertype found" thrown on query with "COUNT" aggregate function
-----------------------------------------------------------------------------------------------------

                 Key: HHH-7216
                 URL: https://hibernate.onjira.com/browse/HHH-7216
             Project: Hibernate ORM
          Issue Type: Bug
          Components: core, entity-manager, query-criteria
    Affects Versions: 4.1.1
            Reporter: Tomas Milo
            Priority: Critical


I have 2 entities:
{code}
@Entity
public class Transaction
{
	@Id
	@Column
	private Integer trId;
...
}
{code}
{code}
@Entity
public class Form
{
	@Id
	@OneToOne
	@JoinColumn( name = "trId" )
	private Transaction transaction;

	@Column
	private String firstname;

...
}
{code} 

And query:
{code}
private EntityManager em;
...
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Long> c = cb.createQuery( Long.class );
Root<Form> form = c.from( Form.class );

c.select( cb.count( form ) );

TypedQuery<Long> q = em.createQuery( c );
int count = q.getResultList().get( 0 ).intValue();
{code}

Following exception was thrown on execution of "TypedQuery<Long> q = em.createQuery( c );":
Caused by: java.lang.IllegalStateException: No supertype found
	at org.hibernate.ejb.metamodel.AbstractIdentifiableType.requireSupertype(AbstractIdentifiableType.java:85)
	at org.hibernate.ejb.metamodel.AbstractIdentifiableType.getIdType(AbstractIdentifiableType.java:173)
	at org.hibernate.ejb.criteria.expression.function.AggregationFunction$COUNT.renderArguments(AggregationFunction.java:110)
	at org.hibernate.ejb.criteria.expression.function.ParameterizedFunctionExpression.render(ParameterizedFunctionExpression.java:94)
	at org.hibernate.ejb.criteria.expression.function.BasicFunctionExpression.renderProjection(BasicFunctionExpression.java:71)
	at org.hibernate.ejb.criteria.QueryStructure.render(QueryStructure.java:250)
	at org.hibernate.ejb.criteria.CriteriaQueryImpl.render(CriteriaQueryImpl.java:338)
	at org.hibernate.ejb.criteria.CriteriaQueryCompiler.compile(CriteriaQueryCompiler.java:216)
	at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:623)

I think the problem is in the org.hibernate.ejb.metamodel.AbstractIdentifiableType.getIdType() function, which is not prepared for "mapped identifier" (as is org.hibernate.ejb.metamodel.MetadataContext.applyIdMetadata procedure).

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