HHH-13777 UnsupportedOperationException is thrown for MappedSuperclass if the id is declared on subclasses

hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/AbstractIdentifiableType.java

@@ -20,7 +20,6 @@ import org.hibernate.metamodel.model.domain.internal.AttributeContainer;
 import org.hibernate.metamodel.model.domain.internal.BasicSqmPathSource;
 import org.hibernate.metamodel.model.domain.internal.EmbeddedSqmPathSource;
 import org.hibernate.query.sqm.SqmPathSource;
-import org.hibernate.type.BasicType;
 import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
 
 import org.jboss.logging.Logger;
@@ -389,7 +388,14 @@ public abstract class AbstractIdentifiableType<J>
 			throw new NotYetImplementedFor6Exception( getClass() );
 		}
 		else {
-			throw new UnsupportedOperationException( "Could not build SqmPathSource for entity identifier : " + getTypeName() );
+			if ( isIdMappingRequired() ) {
+				throw new UnsupportedOperationException( "Could not build SqmPathSource for entity identifier : " + getTypeName() );
+			}
+			return null;
 		}
 	}
+
+	protected boolean isIdMappingRequired() {
+		return true;
+	}
 }

hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/internal/MappedSuperclassTypeImpl.java

@@ -54,4 +54,9 @@ public class MappedSuperclassTypeImpl<X> extends AbstractIdentifiableType<X> imp
 	public <S extends X> SubGraphImplementor<S> makeSubGraph(Class<S> subType) {
 		throw new NotYetImplementedException(  );
 	}
+
+	@Override
+	protected boolean isIdMappingRequired() {
+		return false;
+	}
 }

hibernate-core/src/test/java/org/hibernate/orm/test/metamodel/mapping/inheritance/MappedSuperclassWithIdOnSubclassesTest.java

@@ -0,0 +1,201 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.metamodel.mapping.inheritance;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.MappedSuperclass;
+
+import org.hibernate.persister.entity.EntityPersister;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.ServiceRegistry;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+/**
+ * @author Andrea Boriero
+ */
+@DomainModel(
+		annotatedClasses = {
+				MappedSuperclassWithIdOnSubclassesTest.DomesticCustomer.class,
+				MappedSuperclassWithIdOnSubclassesTest.ForeignCustomer.class
+		}
+)
+@ServiceRegistry
+@SessionFactory
+public class MappedSuperclassWithIdOnSubclassesTest {
+	@Test
+	public void basicTest(SessionFactoryScope scope) {
+		final EntityPersister customerDescriptor = scope.getSessionFactory()
+				.getMetamodel()
+				.findEntityDescriptor( Customer.class );
+		final EntityPersister domesticCustomerDescriptor = scope.getSessionFactory()
+				.getMetamodel()
+				.findEntityDescriptor( DomesticCustomer.class );
+		final EntityPersister foreignCustomerDescriptor = scope.getSessionFactory()
+				.getMetamodel()
+				.findEntityDescriptor( ForeignCustomer.class );
+
+		assert customerDescriptor == null;
+
+		assert domesticCustomerDescriptor.isTypeOrSuperType( domesticCustomerDescriptor );
+		assert !domesticCustomerDescriptor.isTypeOrSuperType( foreignCustomerDescriptor );
+
+		assert !foreignCustomerDescriptor.isTypeOrSuperType( domesticCustomerDescriptor );
+		assert foreignCustomerDescriptor.isTypeOrSuperType( foreignCustomerDescriptor );
+	}
+
+	@Test
+	public void subclassQueryExecutionTest(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					{
+						final DomesticCustomer result = session.createQuery(
+								"select c from DomesticCustomer c",
+								DomesticCustomer.class
+						).uniqueResult();
+
+						assertThat( result, notNullValue() );
+						assertThat( result.getId(), is( 1 ) );
+						assertThat( result.getName(), is( "domestic" ) );
+						assertThat( result.getTaxId(), is( "123" ) );
+					}
+
+					{
+						final ForeignCustomer result = session.createQuery(
+								"select c from ForeignCustomer c",
+								ForeignCustomer.class
+						).uniqueResult();
+
+						assertThat( result, notNullValue() );
+						assertThat( result.getId(), is( 2 ) );
+						assertThat( result.getName(), is( "foreign" ) );
+						assertThat( result.getVat(), is( "987" ) );
+					}
+				}
+		);
+	}
+
+	@BeforeEach
+	public void createTestData(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					session.persist( new DomesticCustomer( 1, "domestic", "123" ) );
+					session.persist( new ForeignCustomer( 2, "foreign", "987" ) );
+				}
+		);
+	}
+
+	@AfterEach
+	public void cleanupTestData(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					session.createQuery( "from DomesticCustomer", DomesticCustomer.class )
+							.list()
+							.forEach( cust -> session.delete( cust ) );
+					session.createQuery( "from ForeignCustomer", ForeignCustomer.class )
+							.list()
+							.forEach( cust -> session.delete( cust ) );
+				}
+		);
+	}
+
+	@MappedSuperclass
+	public static abstract class Customer {
+
+		private String name;
+
+		public Customer() {
+		}
+
+		public Customer(String name) {
+
+			this.name = name;
+		}
+
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+
+	@Entity(name = "DomesticCustomer")
+	public static class DomesticCustomer extends Customer {
+		private Integer id;
+		private String taxId;
+
+		public DomesticCustomer() {
+		}
+
+		public DomesticCustomer(Integer id, String name, String taxId) {
+			super( name );
+			this.id = id;
+			this.taxId = taxId;
+		}
+
+		@Id
+		public Integer getId() {
+			return id;
+		}
+
+		public void setId(Integer id) {
+			this.id = id;
+		}
+
+		public String getTaxId() {
+			return taxId;
+		}
+
+		public void setTaxId(String taxId) {
+			this.taxId = taxId;
+		}
+	}
+
+	@Entity(name = "ForeignCustomer")
+	public static class ForeignCustomer extends Customer {
+		private Integer id;
+		private String vat;
+
+		public ForeignCustomer() {
+		}
+
+		public ForeignCustomer(Integer id, String name, String vat) {
+			super( name );
+			this.id = id;
+			this.vat = vat;
+		}
+
+		@Id
+		public Integer getId() {
+			return id;
+		}
+
+		public void setId(Integer id) {
+			this.id = id;
+		}
+
+		public String getVat() {
+			return vat;
+		}
+
+		public void setVat(String vat) {
+			this.vat = vat;
+		}
+	}
+}