HHH-18131 Composite identifiers with associations stopped working with @IdClass`

hibernate-core/src/main/java/org/hibernate/event/internal/DefaultMergeEventListener.java

@@ -164,7 +164,7 @@ private void merge(MergeEvent event, MergeContext copiedAlready, Object entity)
 		final Object originalId;
 		if ( entry == null ) {
 			final EntityPersister persister = source.getEntityPersister( event.getEntityName(), entity );
-			originalId = persister.getIdentifier( entity, source );
+			originalId = persister.getIdentifier( entity, copiedAlready );
 			if ( originalId != null ) {
 				final EntityKey entityKey;
 				if ( persister.getIdentifierType() instanceof ComponentType ) {

hibernate-core/src/main/java/org/hibernate/event/spi/MergeContext.java

@@ -366,4 +366,8 @@ private String printEntity(Object entity) {
 		// Entity was not found in current persistence context. Use Object#toString() method.
 		return "[" + entity + "]";
 	}
+
+	public EventSource getEventSource() {
+		return session;
+	}
 }

hibernate-core/src/main/java/org/hibernate/internal/util/EntityPrinter.java

@@ -15,6 +15,7 @@
 import org.hibernate.engine.spi.EntityHolder;
 import org.hibernate.engine.spi.EntityKey;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.engine.spi.SharedSessionContractImplementor;
 import org.hibernate.engine.spi.TypedValue;
 import org.hibernate.internal.CoreLogging;
 import org.hibernate.internal.CoreMessageLogger;
@@ -53,7 +54,7 @@ public String toString(String entityName, Object entity) throws HibernateExcepti
 			result.put(
 					entityPersister.getIdentifierPropertyName(),
 					entityPersister.getIdentifierType().toLoggableString(
-							entityPersister.getIdentifier( entity, null ),
+							entityPersister.getIdentifier( entity, (SharedSessionContractImplementor) null ),
 							factory
 					)
 			);

hibernate-core/src/main/java/org/hibernate/jpa/internal/PersistenceUnitUtilImpl.java

@@ -13,6 +13,7 @@
 import org.hibernate.MappingException;
 import org.hibernate.engine.spi.EntityEntry;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.engine.spi.SharedSessionContractImplementor;
 import org.hibernate.jpa.internal.util.PersistenceUtilHelper;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.proxy.LazyInitializer;
@@ -106,7 +107,7 @@ private Object getIdentifierFromPersister(Object entity) {
 		catch (MappingException ex) {
 			throw new IllegalArgumentException( entityClass.getName() + " is not an entity", ex );
 		}
-		return persister.getIdentifier( entity, null );
+		return persister.getIdentifier( entity, (SharedSessionContractImplementor) null );
 	}
 
 }

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/EntityIdentifierMapping.java

@@ -10,6 +10,7 @@
 import org.hibernate.engine.internal.ForeignKeys;
 import org.hibernate.engine.spi.IdentifierValue;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
+import org.hibernate.event.spi.MergeContext;
 
 import jakarta.persistence.EmbeddedId;
 import jakarta.persistence.Id;
@@ -68,6 +69,15 @@ default String getPartName() {
 	 */
 	Object getIdentifier(Object entity);
 
+	/**
+	 * Extract the identifier from an instance of the entity
+	 *
+	 * It's supposed to be use during the merging process
+	 */
+	default Object getIdentifier(Object entity, MergeContext mergeContext){
+		return getIdentifier( entity );
+	}
+
 	/**
 	 * Return the identifier of the persistent or transient object, or throw
 	 * an exception if the instance is "unsaved"

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/InverseNonAggregatedIdentifierMapping.java

@@ -14,6 +14,7 @@
 import org.hibernate.engine.spi.EntityKey;
 import org.hibernate.engine.spi.PersistenceContext;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
+import org.hibernate.event.spi.MergeContext;
 import org.hibernate.internal.util.collections.CollectionHelper;
 import org.hibernate.metamodel.mapping.AttributeMapping;
 import org.hibernate.metamodel.mapping.EmbeddableMappingType;
@@ -196,6 +197,11 @@ public SqlTuple toSqlExpression(
 
 	@Override
 	public Object getIdentifier(Object entity) {
+		return getIdentifier( entity, null );
+	}
+
+	@Override
+	public Object getIdentifier(Object entity, MergeContext mergeContext) {
 		if ( hasContainingClass() ) {
 			final Object id = identifierValueMapper.getRepresentationStrategy().getInstantiator().instantiate(
 					null,
@@ -218,16 +224,17 @@ public Object getIdentifier(Object entity) {
 				//JPA 2 @MapsId + @IdClass points to the pk of the entity
 				else if ( attributeMapping instanceof ToOneAttributeMapping
 						&& !( identifierValueMapper.getAttributeMapping( i ) instanceof ToOneAttributeMapping ) ) {
+					final Object toOne = getIfMerged( o, mergeContext );
 					final ToOneAttributeMapping toOneAttributeMapping = (ToOneAttributeMapping) attributeMapping;
 					final ModelPart targetPart = toOneAttributeMapping.getForeignKeyDescriptor().getPart(
 							toOneAttributeMapping.getSideNature().inverse()
 					);
 					if ( targetPart.isEntityIdentifierMapping() ) {
-						propertyValues[i] = ( (EntityIdentifierMapping) targetPart ).getIdentifier( o );
+						propertyValues[i] = ( (EntityIdentifierMapping) targetPart )
+								.getIdentifier( toOne, mergeContext );
 					}
 					else {
-						propertyValues[i] = o;
-						assert false;
+						propertyValues[i] = toOne;
 					}
 				}
 				else {
@@ -242,6 +249,16 @@ else if ( attributeMapping instanceof ToOneAttributeMapping
 		}
 	}
 
+	private static Object getIfMerged(Object o, MergeContext mergeContext) {
+		if ( mergeContext != null ) {
+			final Object merged = mergeContext.get( o );
+			if ( merged != null ) {
+				return merged;
+			}
+		}
+		return o;
+	}
+
 	@Override
 	public void setIdentifier(Object entity, Object id, SharedSessionContractImplementor session) {
 		final Object[] propertyValues = new Object[identifierValueMapper.getNumberOfAttributeMappings()];

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/NonAggregatedIdentifierMappingImpl.java

@@ -15,6 +15,7 @@
 import org.hibernate.engine.spi.EntityKey;
 import org.hibernate.engine.spi.PersistenceContext;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
+import org.hibernate.event.spi.MergeContext;
 import org.hibernate.internal.util.collections.CollectionHelper;
 import org.hibernate.mapping.Component;
 import org.hibernate.mapping.RootClass;
@@ -237,6 +238,11 @@ public String getAttributeName() {
 
 	@Override
 	public Object getIdentifier(Object entity) {
+		return getIdentifier( entity, null );
+	}
+
+	@Override
+	public Object getIdentifier(Object entity, MergeContext mergeContext) {
 		if ( hasContainingClass() ) {
 			final LazyInitializer lazyInitializer = HibernateProxy.extractLazyInitializer( entity );
 			if ( lazyInitializer != null ) {
@@ -259,16 +265,16 @@ public Object getIdentifier(Object entity) {
 				//JPA 2 @MapsId + @IdClass points to the pk of the entity
 				else if ( attributeMapping instanceof ToOneAttributeMapping
 						&& !( identifierValueMapper.getAttributeMapping( i ) instanceof ToOneAttributeMapping ) ) {
+					final Object toOne = getIfMerged( o, mergeContext );
 					final ToOneAttributeMapping toOneAttributeMapping = (ToOneAttributeMapping) attributeMapping;
 					final ModelPart targetPart = toOneAttributeMapping.getForeignKeyDescriptor().getPart(
 							toOneAttributeMapping.getSideNature().inverse()
 					);
 					if ( targetPart.isEntityIdentifierMapping() ) {
-						propertyValues[i] = ( (EntityIdentifierMapping) targetPart ).getIdentifier( o );
+						propertyValues[i] = ( (EntityIdentifierMapping) targetPart ).getIdentifier( toOne, mergeContext );
 					}
 					else {
-						propertyValues[i] = o;
-						assert false;
+						propertyValues[i] = toOne;
 					}
 				}
 				else {
@@ -285,6 +291,16 @@ else if ( attributeMapping instanceof ToOneAttributeMapping
 		}
 	}
 
+	private static Object getIfMerged(Object o, MergeContext mergeContext) {
+		if ( mergeContext != null ) {
+			final Object merged = mergeContext.get( o );
+			if ( merged != null ) {
+				return merged;
+			}
+		}
+		return o;
+	}
+
 	@Override
 	public void setIdentifier(Object entity, Object id, SharedSessionContractImplementor session) {
 		final Object[] propertyValues = new Object[identifierValueMapper.getNumberOfAttributeMappings()];

hibernate-core/src/main/java/org/hibernate/persister/entity/AbstractEntityPersister.java

@@ -100,6 +100,7 @@
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
 import org.hibernate.event.spi.EventSource;
 import org.hibernate.event.spi.LoadEvent;
+import org.hibernate.event.spi.MergeContext;
 import org.hibernate.generator.BeforeExecutionGenerator;
 import org.hibernate.generator.EventType;
 import org.hibernate.generator.Generator;
@@ -4724,6 +4725,11 @@ public Object getIdentifier(Object entity, SharedSessionContractImplementor sess
 		return identifierMapping.getIdentifier( entity );
 	}
 
+	@Override
+	public Object getIdentifier(Object entity, MergeContext mergeContext) {
+		return identifierMapping.getIdentifier( entity, mergeContext );
+	}
+
 	@Override
 	public void setIdentifier(Object entity, Object id, SharedSessionContractImplementor session) {
 		identifierMapping.setIdentifier( entity, id, session );

hibernate-core/src/main/java/org/hibernate/persister/entity/EntityPersister.java

@@ -30,6 +30,7 @@
 import org.hibernate.engine.spi.SessionImplementor;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
 import org.hibernate.event.spi.EventSource;
+import org.hibernate.event.spi.MergeContext;
 import org.hibernate.generator.BeforeExecutionGenerator;
 import org.hibernate.generator.EventType;
 import org.hibernate.generator.Generator;
@@ -1130,8 +1131,18 @@ default Object getValue(Object object, int i) {
 	 */
 	Object getIdentifier(Object entity, SharedSessionContractImplementor session);
 
-    /**
-     * Inject the identifier value into the given entity.
+	/**
+	 * Get the identifier of an instance from the object's identifier property.
+	 * Throw an exception if it has no identifier property.
+	 *
+	 * It's supposed to be use during the merging process
+	 */
+	default Object getIdentifier(Object entity, MergeContext mergeContext) {
+		return getIdentifier( entity, mergeContext.getEventSource() );
+	}
+
+	/**
+	 * Inject the identifier value into the given entity.
 	 */
 	void setIdentifier(Object entity, Object id, SharedSessionContractImplementor session);
 

hibernate-core/src/main/java/org/hibernate/query/derived/AnonymousTupleBasicEntityIdentifierMapping.java

@@ -9,6 +9,7 @@
 import org.hibernate.Incubating;
 import org.hibernate.engine.spi.IdentifierValue;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
+import org.hibernate.event.spi.MergeContext;
 import org.hibernate.metamodel.mapping.BasicEntityIdentifierMapping;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.ManagedMappingType;
@@ -51,6 +52,11 @@ public Object getIdentifier(Object entity) {
 		return delegate.getIdentifier( entity );
 	}
 
+	@Override
+	public Object getIdentifier(Object entity, MergeContext mergeContext) {
+		return delegate.getIdentifier( entity, mergeContext );
+	}
+
 	@Override
 	public void setIdentifier(Object entity, Object id, SharedSessionContractImplementor session) {
 		delegate.setIdentifier( entity, id, session );

hibernate-core/src/main/java/org/hibernate/query/derived/AnonymousTupleEmbeddedEntityIdentifierMapping.java

@@ -12,6 +12,7 @@
 import org.hibernate.Incubating;
 import org.hibernate.engine.spi.IdentifierValue;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
+import org.hibernate.event.spi.MergeContext;
 import org.hibernate.metamodel.mapping.CompositeIdentifierMapping;
 import org.hibernate.metamodel.mapping.EmbeddableMappingType;
 import org.hibernate.metamodel.mapping.internal.SingleAttributeIdentifierMapping;
@@ -70,6 +71,11 @@ public Object getIdentifier(Object entity) {
 		return delegate.getIdentifier( entity );
 	}
 
+	@Override
+	public Object getIdentifier(Object entity, MergeContext mergeContext) {
+		return delegate.getIdentifier( entity, mergeContext );
+	}
+
 	@Override
 	public void setIdentifier(Object entity, Object id, SharedSessionContractImplementor session) {
 		delegate.setIdentifier( entity, id, session );

hibernate-core/src/main/java/org/hibernate/query/derived/AnonymousTupleNonAggregatedEntityIdentifierMapping.java

@@ -14,6 +14,7 @@
 import org.hibernate.engine.FetchTiming;
 import org.hibernate.engine.spi.IdentifierValue;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
+import org.hibernate.event.spi.MergeContext;
 import org.hibernate.metamodel.mapping.EmbeddableMappingType;
 import org.hibernate.metamodel.mapping.NonAggregatedIdentifierMapping;
 import org.hibernate.metamodel.mapping.internal.IdClassEmbeddable;
@@ -79,6 +80,12 @@ public Object getIdentifier(Object entity) {
 		return delegate.getIdentifier( entity );
 	}
 
+
+	@Override
+	public Object getIdentifier(Object entity, MergeContext mergeContext) {
+		return delegate.getIdentifier( entity, mergeContext );
+	}
+
 	@Override
 	public void setIdentifier(Object entity, Object id, SharedSessionContractImplementor session) {
 		delegate.setIdentifier( entity, id, session );

hibernate-core/src/main/java/org/hibernate/type/AnyType.java

@@ -149,7 +149,7 @@ private Object extractIdentifier(Object entity, SessionFactoryImplementor factor
 		final EntityPersister concretePersister = guessEntityPersister( entity, factory );
 		return concretePersister == null
 				? null
-				: concretePersister.getIdentifier( entity, null );
+				: concretePersister.getIdentifier( entity, (SharedSessionContractImplementor) null );
 	}
 
 	private EntityPersister guessEntityPersister(Object object, SessionFactoryImplementor factory) {

hibernate-core/src/main/java/org/hibernate/type/EntityType.java

@@ -284,7 +284,7 @@ private Object extractIdentifier(Object entity, SessionFactoryImplementor factor
 		final EntityPersister concretePersister = getAssociatedEntityPersister( factory );
 		return concretePersister == null
 				? null
-				: concretePersister.getIdentifier( entity, null );
+				: concretePersister.getIdentifier( entity, (SharedSessionContractImplementor) null );
 	}
 
 	@Override
@@ -353,7 +353,7 @@ public int getHashCode(Object x, SessionFactoryImplementor factory) {
 			else {
 				final Class<?> mappedClass = persister.getMappedClass();
 				if ( mappedClass.isAssignableFrom( x.getClass() ) ) {
-					id = persister.getIdentifier( x, null );
+					id = persister.getIdentifier( x, (SharedSessionContractImplementor) null );
 				}
 				else {
 					id = x;
@@ -387,7 +387,7 @@ public boolean isEqual(Object x, Object y, SessionFactoryImplementor factory) {
 		}
 		else {
 			if ( mappedClass.isAssignableFrom( x.getClass() ) ) {
-				xid = persister.getIdentifier( x, null );
+				xid = persister.getIdentifier( x, (SharedSessionContractImplementor) null );
 			}
 			else {
 				//JPA 2 case where @IdClass contains the id and not the associated entity
@@ -402,7 +402,7 @@ public boolean isEqual(Object x, Object y, SessionFactoryImplementor factory) {
 		}
 		else {
 			if ( mappedClass.isAssignableFrom( y.getClass() ) ) {
-				yid = persister.getIdentifier( y, null );
+				yid = persister.getIdentifier( y, (SharedSessionContractImplementor) null );
 			}
 			else {
 				//JPA 2 case where @IdClass contains the id and not the associated entity
@@ -564,7 +564,7 @@ public String toLoggableString(Object value, SessionFactoryImplementor factory)
 				id = lazyInitializer.getInternalIdentifier();
 			}
 			else {
-				id = persister.getIdentifier( value, null );
+				id = persister.getIdentifier( value, (SharedSessionContractImplementor) null );
 			}
 
 			result.append( '#' )

hibernate-core/src/test/java/org/hibernate/engine/internal/StatisticalLoggingSessionEventListenerTest.java

@@ -1,16 +1,12 @@
 /*
- * 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
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
  */
 package org.hibernate.engine.internal;
 
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
 
 import org.hibernate.cfg.AvailableSettings;
 import org.hibernate.internal.CoreMessageLogger;
@@ -183,7 +179,7 @@ void testSessionMetricsLog(SessionFactoryScope scope) {
 		// Number of lines
 		assertThat( sessionMetricsLog.lines().count() )
 				.as( "The StatisticalLoggingSessionEventListener should write a line per metric ("
-					 + numberOfMetrics + " lines) plus a header and a footer (2 lines)" )
+					+ numberOfMetrics + " lines) plus a header and a footer (2 lines)" )
 				.isEqualTo( numberOfMetrics + 2 );
 		// Total time
 		long sumDuration = metricList.stream().map( SessionMetric::getDuration ).mapToLong( Long::longValue ).sum();