HHH-16070 Check for type parameters when setting declared identifier

hibernate-core/src/main/java/org/hibernate/boot/model/internal/ClassPropertyHolder.java

@@ -329,7 +329,7 @@ public class ClassPropertyHolder extends AbstractPropertyHolder {
 		}
 	}
 
-	private String getTypeName(Value value) {
+	static String getTypeName(Value value) {
 		if ( value instanceof Component ) {
 			final Component component = (Component) value;
 			final String typeName = component.getTypeName();
@@ -341,7 +341,7 @@ public class ClassPropertyHolder extends AbstractPropertyHolder {
 		return ( (SimpleValue) value ).getTypeName();
 	}
 
-	private void setTypeName(Value value, String typeName) {
+	static void setTypeName(Value value, String typeName) {
 		if ( value instanceof ToOne ) {
 			final ToOne toOne = (ToOne) value;
 			toOne.setReferencedEntityName( typeName );

hibernate-core/src/main/java/org/hibernate/boot/model/internal/PropertyBinder.java

@@ -8,6 +8,7 @@ package org.hibernate.boot.model.internal;
 
 import java.lang.annotation.Annotation;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
@@ -28,6 +29,7 @@ import jakarta.persistence.Version;
 import org.hibernate.AnnotationException;
 import org.hibernate.AssertionFailure;
 import org.hibernate.MappingException;
+import org.hibernate.PropertyNotFoundException;
 import org.hibernate.annotations.Any;
 import org.hibernate.annotations.AttributeBinderType;
 import org.hibernate.annotations.CompositeType;
@@ -317,13 +319,7 @@ public class PropertyBinder {
 							inheritanceStatePerClass,
 							buildingContext
 					);
-					if ( superclass != null ) {
+					setDeclaredIdentifier( rootClass, superclass, property );
-						superclass.setDeclaredIdentifierProperty(property);
-					}
-					else {
-						//we know the property is on the actual entity
-						rootClass.setDeclaredIdentifierProperty( property );
-					}
 				}
 			}
 		}
@@ -342,6 +338,65 @@ public class PropertyBinder {
 		return property;
 	}
 
+	private void setDeclaredIdentifier(RootClass rootClass, MappedSuperclass superclass, Property prop) {
+		if ( superclass == null ) {
+			rootClass.setDeclaredIdentifierProperty( prop );
+			return;
+		}
+		// If the type has type parameters, we have to set the declared identifier property on the rootClass
+		// to be able to retrieve it with the correct type based on type variable assignment in the subclass
+		final Class<?> type = buildingContext.getBootstrapContext().getReflectionManager().toClass( declaringClass );
+		if ( type.getTypeParameters().length == 0 ) {
+			superclass.setDeclaredIdentifierProperty( prop );
+		}
+		else {
+			// If the type has type parameters, we have to look up the XClass and actual property again
+			// because the given XClass has a TypeEnvironment based on the type variable assignments of a subclass
+			// and that might result in a wrong property type being used for a property which uses a type variable
+			final XClass actualDeclaringClass = buildingContext.getBootstrapContext().getReflectionManager().toXClass( type );
+			for ( XProperty declaredProperty : actualDeclaringClass.getDeclaredProperties( prop.getPropertyAccessorName() ) ) {
+				if ( prop.getName().equals( declaredProperty.getName() ) ) {
+					final PropertyData inferredData = new PropertyInferredData(
+							actualDeclaringClass,
+							declaredProperty,
+							null,
+							buildingContext.getBootstrapContext().getReflectionManager()
+					);
+					final Value originalValue = prop.getValue();
+					if ( originalValue instanceof SimpleValue ) {
+						// Avoid copying when the property doesn't depend on a type variable
+						if ( inferredData.getTypeName().equals( ClassPropertyHolder.getTypeName( originalValue ) ) ) {
+							superclass.setDeclaredIdentifierProperty( prop );
+							return;
+						}
+					}
+					// If the property depends on a type variable, we have to copy it and the Value
+					final Property actualProperty = prop.copy();
+					actualProperty.setReturnedClassName( inferredData.getTypeName() );
+					final Value value = actualProperty.getValue().copy();
+					assert !(value instanceof Collection);
+					ClassPropertyHolder.setTypeName( value, inferredData.getTypeName() );
+					if ( value instanceof Component ) {
+						Component component = ( (Component) value );
+						Iterator<Property> propertyIterator = component.getPropertyIterator();
+						while ( propertyIterator.hasNext() ) {
+							Property property = propertyIterator.next();
+							try {
+								property.getGetter( component.getComponentClass() );
+							}
+							catch (PropertyNotFoundException e) {
+								propertyIterator.remove();
+							}
+						}
+					}
+					actualProperty.setValue( value );
+					superclass.setDeclaredIdentifierProperty( actualProperty );
+					break;
+				}
+			}
+		}
+	}
+
 	private Component getOrCreateCompositeId(RootClass rootClass) {
 		final Component id = (Component) rootClass.getIdentifier();
 		if ( id == null ) {

hibernate-core/src/main/java/org/hibernate/metamodel/internal/AttributeFactory.java

@@ -583,9 +583,22 @@ public class AttributeFactory {
 
 		final CompositeTypeImplementor ownerComponentType = (CompositeTypeImplementor) ownerBootDescriptor.getType();
 		final EmbeddableValuedModelPart ownerMappingModelDescriptor = ownerComponentType.getMappingModelPart();
-		final EmbeddableRepresentationStrategy ownerRepStrategy = ownerMappingModelDescriptor
+		final EmbeddableRepresentationStrategy ownerRepStrategy;
+
+		if ( ownerMappingModelDescriptor == null ) {
+			// When an entity uses a type variable, bound by a mapped superclass, for an embedded id,
+			// we will not create a model part for the component, but we still need the representation strategy here,
+			// in order to discover the property members to expose on the JPA metamodel
+			ownerRepStrategy = ownerBootDescriptor.getBuildingContext()
+							.getBootstrapContext()
+							.getRepresentationStrategySelector()
+							.resolveStrategy( ownerBootDescriptor, null, metadataContext.getRuntimeModelCreationContext() );
+		}
+		else {
+			ownerRepStrategy = ownerMappingModelDescriptor
 					.getEmbeddableTypeDescriptor()
 					.getRepresentationStrategy();
+		}
 
 		if ( ownerRepStrategy.getMode() == RepresentationMode.MAP ) {
 			return new MapMember(

hibernate-core/src/main/java/org/hibernate/metamodel/internal/MetadataContext.java

@@ -24,6 +24,7 @@ import org.hibernate.internal.HEMLogging;
 import org.hibernate.internal.util.ReflectHelper;
 import org.hibernate.internal.util.collections.CollectionHelper;
 import org.hibernate.mapping.Component;
+import org.hibernate.mapping.KeyValue;
 import org.hibernate.mapping.MappedSuperclass;
 import org.hibernate.mapping.PersistentClass;
 import org.hibernate.mapping.Property;
@@ -428,6 +429,12 @@ public class MetadataContext {
 				//noinspection unchecked rawtypes
 				( ( AttributeContainer) identifiableType ).getInFlightAccess().applyIdAttribute( idAttribute );
 			}
+			else if ( persistentClass.getIdentifier() instanceof Component
+					&& persistentClass.getIdentifierProperty() != getSuperclassIdentifier( persistentClass ) ) {
+				// If the identifier is a generic component, we have to call buildIdAttribute anyway,
+				// as this will create and register the EmbeddableType for the subtype
+				attributeFactory.buildIdAttribute( identifiableType, persistentClass.getIdentifierProperty() );
+			}
 		}
 		else {
 			// we have a non-aggregated composite-id
@@ -476,6 +483,34 @@ public class MetadataContext {
 		}
 	}
 
+	private Property getSuperclassIdentifier(PersistentClass persistentClass) {
+		final Property declaredIdentifierProperty = persistentClass.getDeclaredIdentifierProperty();
+		if ( declaredIdentifierProperty != null ) {
+			return declaredIdentifierProperty;
+		}
+		if ( persistentClass.getSuperMappedSuperclass() != null ) {
+			return getSuperclassIdentifier( persistentClass.getSuperMappedSuperclass() );
+		}
+		else if ( persistentClass.getSuperclass() != null ) {
+			return getSuperclassIdentifier( persistentClass.getSuperclass() );
+		}
+		return null;
+	}
+
+	private Property getSuperclassIdentifier(MappedSuperclass persistentClass) {
+		final Property declaredIdentifierProperty = persistentClass.getDeclaredIdentifierProperty();
+		if ( declaredIdentifierProperty != null ) {
+			return declaredIdentifierProperty;
+		}
+		if ( persistentClass.getSuperMappedSuperclass() != null ) {
+			return getSuperclassIdentifier( persistentClass.getSuperMappedSuperclass() );
+		}
+		else if ( persistentClass.getSuperPersistentClass() != null ) {
+			return getSuperclassIdentifier( persistentClass.getSuperPersistentClass() );
+		}
+		return null;
+	}
+
 	private EmbeddableTypeImpl<?> applyIdClassMetadata(Component idClassComponent) {
 		final JavaTypeRegistry registry = getTypeConfiguration()
 				.getJavaTypeRegistry();