HHH-16833 Assertion Error when inserting two entities linked with a OneToOne relation

hibernate-core/src/main/java/org/hibernate/loader/ast/internal/DatabaseSnapshotExecutor.java

@@ -133,14 +133,15 @@ class DatabaseSnapshotExecutor {
 		entityDescriptor.forEachAttributeMapping(
 				attributeMapping -> {
 					final NavigablePath navigablePath = rootPath.append( attributeMapping.getAttributeName() );
-					domainResults.add(
+					final DomainResult<Object> snapshotDomainResult = attributeMapping.createSnapshotDomainResult(
-							attributeMapping.createSnapshotDomainResult(
 							navigablePath,
 							rootTableGroup,
 							null,
 							state
-							)
 					);
+					if ( snapshotDomainResult != null ) {
+						domainResults.add( snapshotDomainResult );
+					}
 				}
 		);
 

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

@@ -88,12 +88,9 @@ import org.hibernate.sql.results.graph.embeddable.EmbeddableValuedFetchable;
 import org.hibernate.sql.results.graph.entity.EntityFetch;
 import org.hibernate.sql.results.graph.entity.EntityValuedFetchable;
 import org.hibernate.sql.results.graph.entity.internal.EntityDelayedFetchImpl;
-import org.hibernate.sql.results.graph.entity.internal.EntityDelayedResultImpl;
 import org.hibernate.sql.results.graph.entity.internal.EntityFetchJoinedImpl;
 import org.hibernate.sql.results.graph.entity.internal.EntityFetchSelectImpl;
-import org.hibernate.sql.results.graph.entity.internal.EntityResultImpl;
 import org.hibernate.sql.results.graph.entity.internal.EntityResultJoinedSubclassImpl;
-import org.hibernate.sql.results.graph.entity.internal.NotFoundSnapshotResult;
 import org.hibernate.sql.results.internal.domain.CircularBiDirectionalFetchImpl;
 import org.hibernate.sql.results.internal.domain.CircularFetchImpl;
 import org.hibernate.type.ComponentType;
@@ -1709,73 +1706,17 @@ public class ToOneAttributeMapping
 			TableGroup parentTableGroup,
 			String resultVariable,
 			DomainResultCreationState creationState) {
-		// We need a join if either
+		// it's a Snapshot then we just need the value of the FK when it belongs to the parentTableGroup
-		//		- the association is mapped with `@NotFound`
+		if ( sideNature == ForeignKeyDescriptor.Nature.KEY ) {
-		// 		- the key is on the referring side i.e. this is an inverse to-one
+			return foreignKeyDescriptor.getKeyPart().createDomainResult(
-		// 			and if the FK refers to a non-PK
-		final boolean forceJoin = hasNotFoundAction()
-				|| sideNature == ForeignKeyDescriptor.Nature.TARGET
-				|| referencedPropertyName != null;
-		final TableGroup tableGroupToUse;
-		if ( forceJoin ) {
-			tableGroupToUse = creationState.getSqlAstCreationState().getFromClauseAccess().resolveTableGroup(
-					navigablePath,
-					np -> {
-						final TableGroupJoin tableGroupJoin = createTableGroupJoin(
-								navigablePath,
-								parentTableGroup,
-								null,
-								null,
-								getDefaultSqlAstJoinType( parentTableGroup ),
-								true,
-								false,
-								creationState.getSqlAstCreationState()
-						);
-						parentTableGroup.addTableGroupJoin( tableGroupJoin );
-						return tableGroupJoin.getJoinedGroup();
-					}
-			);
-		}
-		else {
-			tableGroupToUse = createTableGroupForDelayedFetch(
 					navigablePath,
 					parentTableGroup,
 					resultVariable,
 					creationState
 			);
 		}
-
-		if ( hasNotFoundAction() ) {
-			assert tableGroupToUse != parentTableGroup;
-			//noinspection unchecked
-			return new NotFoundSnapshotResult(
-					navigablePath,
-					this,
-					parentTableGroup,
-					tableGroupToUse,
-					creationState
-			);
-		}
-		if ( referencedPropertyName == null ) {
-			//noinspection unchecked
-			return new EntityDelayedResultImpl(
-					navigablePath.append( EntityIdentifierMapping.ID_ROLE_NAME ),
-					this,
-					tableGroupToUse,
-					creationState
-			);
-		}
 		else {
-			// We don't support proxies based on a non-PK yet, so we must fetch the whole entity
+			return null;
-			final EntityResultImpl entityResult = new EntityResultImpl(
-					navigablePath,
-					this,
-					tableGroupToUse,
-					null
-			);
-			entityResult.afterInitialize( entityResult, creationState );
-			//noinspection unchecked
-			return entityResult;
 		}
 	}
 
@@ -2360,7 +2301,20 @@ public class ToOneAttributeMapping
 
 	@Override
 	public void addToCacheKey(MutableCacheKeyBuilder cacheKey, Object value, SharedSessionContractImplementor session) {
-		foreignKeyDescriptor.addToCacheKey( cacheKey, foreignKeyDescriptor.getAssociationKeyFromSide( value, sideNature.inverse(), session ), session );
+		final Object cacheValue;
+		// the value may come from a database snapshot, in this case it corresponds to the value of the key and can be
+		// added to the cache key
+		if ( value != null && foreignKeyDescriptor.getJavaType().getJavaTypeClass() == value.getClass() ) {
+			cacheValue = value;
+		}
+		else {
+			cacheValue = foreignKeyDescriptor.getAssociationKeyFromSide(
+					value,
+					sideNature.inverse(),
+					session
+			);
+		}
+		foreignKeyDescriptor.addToCacheKey( cacheKey, cacheValue, session );
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/sql/results/graph/entity/internal/NotFoundSnapshotAssembler.java

@@ -1,69 +0,0 @@
-/*
- * 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.sql.results.graph.entity.internal;
-
-import org.hibernate.FetchNotFoundException;
-import org.hibernate.annotations.NotFoundAction;
-import org.hibernate.metamodel.mapping.internal.ToOneAttributeMapping;
-import org.hibernate.spi.NavigablePath;
-import org.hibernate.sql.results.graph.DomainResultAssembler;
-import org.hibernate.sql.results.jdbc.spi.JdbcValuesSourceProcessingOptions;
-import org.hibernate.sql.results.jdbc.spi.RowProcessingState;
-import org.hibernate.type.descriptor.java.JavaType;
-
-/**
- * Specialized DomainResultAssembler for {@link org.hibernate.annotations.NotFound} associations
- *
- * @author Steve Ebersole
- */
-public class NotFoundSnapshotAssembler implements DomainResultAssembler {
-	private final NavigablePath navigablePath;
-	private final ToOneAttributeMapping toOneMapping;
-	private final DomainResultAssembler<?> keyValueAssembler;
-	private final DomainResultAssembler<?> targetValueAssembler;
-
-	public NotFoundSnapshotAssembler(
-			NavigablePath navigablePath,
-			ToOneAttributeMapping toOneMapping,
-			DomainResultAssembler<?> keyValueAssembler,
-			DomainResultAssembler<?> targetValueAssembler) {
-		assert toOneMapping.hasNotFoundAction();
-
-		this.navigablePath = navigablePath;
-		this.toOneMapping = toOneMapping;
-		this.keyValueAssembler = keyValueAssembler;
-		this.targetValueAssembler = targetValueAssembler;
-	}
-
-	@Override
-	public Object assemble(RowProcessingState rowProcessingState, JdbcValuesSourceProcessingOptions options) {
-		final Object keyValue = keyValueAssembler.assemble( rowProcessingState );
-		final Object targetValue = targetValueAssembler.assemble( rowProcessingState );
-
-		// because of `@NotFound` these could be mismatched
-		if ( keyValue != null ) {
-			if ( targetValue != null ) {
-				if ( toOneMapping.getNotFoundAction() == NotFoundAction.IGNORE ) {
-					return null;
-				}
-				else {
-					throw new FetchNotFoundException(
-							toOneMapping.getAssociatedEntityMappingType().getEntityName(),
-							keyValue
-					);
-				}
-			}
-		}
-
-		return targetValue;
-	}
-
-	@Override
-	public JavaType<?> getAssembledJavaType() {
-		return toOneMapping.getJavaType();
-	}
-}

hibernate-core/src/main/java/org/hibernate/sql/results/graph/entity/internal/NotFoundSnapshotResult.java

@@ -1,88 +0,0 @@
-/*
- * 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.sql.results.graph.entity.internal;
-
-import org.hibernate.metamodel.mapping.ForeignKeyDescriptor;
-import org.hibernate.metamodel.mapping.internal.ToOneAttributeMapping;
-import org.hibernate.spi.NavigablePath;
-import org.hibernate.sql.ast.tree.from.TableGroup;
-import org.hibernate.sql.results.graph.AssemblerCreationState;
-import org.hibernate.sql.results.graph.DomainResult;
-import org.hibernate.sql.results.graph.DomainResultAssembler;
-import org.hibernate.sql.results.graph.DomainResultCreationState;
-import org.hibernate.sql.results.graph.FetchParentAccess;
-import org.hibernate.type.descriptor.java.JavaType;
-
-/**
- * @author Steve Ebersole
- */
-public class NotFoundSnapshotResult implements DomainResult {
-	private final NavigablePath navigablePath;
-	private final ToOneAttributeMapping toOneMapping;
-
-	private final DomainResult<?> keyResult;
-	private final DomainResult<?> targetResult;
-
-	public NotFoundSnapshotResult(
-			NavigablePath navigablePath,
-			ToOneAttributeMapping toOneMapping,
-			TableGroup keyTableGroup,
-			TableGroup targetTableGroup,
-			DomainResultCreationState creationState) {
-		this.navigablePath = navigablePath;
-		this.toOneMapping = toOneMapping;
-
-		// NOTE: this currently assumes that only the key side can be
-		// defined with `@NotFound`.  That feels like a reasonable
-		// assumption, though there is sme question whether to support
-		// this for the inverse side also when a join table is used.
-		//
-		// however, that would mean a 1-1 with a join-table which
-		// is pretty odd mapping
-		final ForeignKeyDescriptor fkDescriptor = toOneMapping.getForeignKeyDescriptor();
-		this.keyResult = fkDescriptor.createKeyDomainResult(
-				navigablePath,
-				targetTableGroup,
-				null,
-				creationState
-		);
-		this.targetResult = fkDescriptor.createTargetDomainResult(
-				navigablePath,
-				targetTableGroup,
-				null,
-				creationState
-		);
-	}
-
-	@Override
-	public NavigablePath getNavigablePath() {
-		return navigablePath;
-	}
-
-	@Override
-	public JavaType<?> getResultJavaType() {
-		return toOneMapping.getJavaType();
-	}
-
-	@Override
-	public String getResultVariable() {
-		return null;
-	}
-
-	@Override
-	public DomainResultAssembler<Object> createResultAssembler(
-			FetchParentAccess parentAccess,
-			AssemblerCreationState creationState) {
-		return new NotFoundSnapshotAssembler(
-				navigablePath,
-				toOneMapping,
-				keyResult.createResultAssembler( parentAccess, creationState ),
-				targetResult.createResultAssembler( parentAccess, creationState )
-		);
-	}
-
-}

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

@@ -149,11 +149,10 @@ public class ManyToOneType extends EntityType {
 			return true;
 		}
 
-		assert current.getClass().isAssignableFrom( old.getClass() );
 
 		// the ids are fully resolved, so compare them with isDirty(), not isModified()
 		return getIdentifierOrUniqueKeyType( session.getFactory() )
-				.isDirty( getIdentifier( old, session ), getIdentifier( current, session ), session );
+				.isDirty( old, getIdentifier( current, session ), session );
 	}
 
 	@Override

hibernate-core/src/test/java/org/hibernate/orm/test/version/VersionedBidirectionalOneToOneMergeTest.java

@@ -29,7 +29,7 @@ public class VersionedBidirectionalOneToOneMergeTest {
 		AnotherTestEntity anotherTestEntity = new AnotherTestEntity();
 		scope.inTransaction(
 				session -> {
-					session.persist( anotherTestEntity );
+					session.merge( anotherTestEntity );
 				}
 		);
 
@@ -66,6 +66,8 @@ public class VersionedBidirectionalOneToOneMergeTest {
 		@Id
 		UUID uuid = UUID.randomUUID();
 
+		String name;
+
 		@OneToOne(mappedBy = "anotherTestEntity")
 		TestEntity testEntity;