HHH-18936 suppress TransientObjectException when the FK is marked @OnDelete(CASCADE)

hibernate-core/src/main/java/org/hibernate/engine/internal/Cascade.java

@@ -10,6 +10,7 @@
 import java.util.List;
 
 import org.hibernate.HibernateException;
+import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.bytecode.enhance.spi.interceptor.LazyAttributeLoadingInterceptor;
 import org.hibernate.collection.spi.PersistentCollection;
 import org.hibernate.engine.spi.CascadeStyle;
@@ -117,6 +118,8 @@ public static <T> void cascade(
 						hasUninitializedLazyProperties
 								&& !persister.getBytecodeEnhancementMetadata()
 										.isAttributeLoaded( parent, propertyName );
+				final boolean isCascadeDeleteEnabled =
+						persister.getEntityMetamodel().getPropertyOnDeleteActions()[i] == OnDeleteAction.CASCADE;
 
 				if ( style.doCascade( action ) ) {
 					final Object child;
@@ -178,7 +181,7 @@ else if ( action.performOnLazyProperty() && type instanceof EntityType ) {
 							style,
 							propertyName,
 							anything,
-							false
+							isCascadeDeleteEnabled
 					);
 				}
 				else {
@@ -193,7 +196,7 @@ else if ( action.performOnLazyProperty() && type instanceof EntityType ) {
 								type,
 								style,
 								propertyName,
-								false
+								isCascadeDeleteEnabled
 						);
 					}
 				}

hibernate-core/src/main/java/org/hibernate/engine/spi/CascadingActions.java

@@ -340,7 +340,7 @@ public void cascade(
 				Void context,
 				boolean isCascadeDeleteEnabled)
 				throws HibernateException {
-			if ( child != null && isChildTransient( session, child, entityName ) ) {
+			if ( child != null && isChildTransient( session, child, entityName, isCascadeDeleteEnabled ) ) {
 				throw new TransientObjectException( "Persistent instance references an unsaved transient instance of '"
 						+ entityName + "' (save the transient instance before flushing)" );
 				//TODO: should be TransientPropertyValueException
@@ -387,7 +387,7 @@ public String toString() {
 		}
 	};
 
-	private static boolean isChildTransient(EventSource session, Object child, String entityName) {
+	private static boolean isChildTransient(EventSource session, Object child, String entityName, boolean isCascadeDeleteEnabled) {
 		if ( isHibernateProxy( child ) ) {
 			// a proxy is always non-transient
 			// and ForeignKeys.isTransient()
@@ -402,7 +402,11 @@ private static boolean isChildTransient(EventSource session, Object child, Strin
 				// we are good, even if it's not yet
 				// inserted, since ordering problems
 				// are detected and handled elsewhere
-				return entry.getStatus().isDeletedOrGone();
+				return entry.getStatus().isDeletedOrGone()
+					// if the foreign key is 'on delete cascade'
+					// we don't have to throw because the database
+					// will delete the parent for us
+					&& !isCascadeDeleteEnabled;
 			}
 			else {
 				// TODO: check if it is a merged entity which has not yet been flushed

hibernate-core/src/main/java/org/hibernate/mapping/Property.java

@@ -12,6 +12,7 @@
 import org.hibernate.HibernateException;
 import org.hibernate.Internal;
 import org.hibernate.MappingException;
+import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.boot.model.relational.Database;
 import org.hibernate.boot.model.relational.SqlStringGenerationContext;
 import org.hibernate.bytecode.enhance.spi.interceptor.EnhancementHelper;
@@ -134,6 +135,10 @@ public void resetOptional(boolean optional) {
 		}
 	}
 
+	public OnDeleteAction getOnDeleteAction() {
+		return value instanceof ToOne toOne ? toOne.getOnDeleteAction() : null;
+	}
+
 	public CascadeStyle getCascadeStyle() throws MappingException {
 		final Type type = value.getType();
 		if ( type instanceof AnyType ) {

hibernate-core/src/main/java/org/hibernate/tuple/AbstractNonIdentifierAttribute.java

@@ -5,6 +5,7 @@
 package org.hibernate.tuple;
 
 import org.hibernate.FetchMode;
+import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.engine.spi.CascadeStyle;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.persister.walking.spi.AttributeSource;
@@ -92,6 +93,11 @@ public CascadeStyle getCascadeStyle() {
 		return attributeInformation.getCascadeStyle();
 	}
 
+	@Override
+	public OnDeleteAction getOnDeleteAction() {
+		return attributeInformation.getOnDeleteAction();
+	}
+
 	@Override
 	public FetchMode getFetchMode() {
 		return attributeInformation.getFetchMode();

hibernate-core/src/main/java/org/hibernate/tuple/BaselineAttributeInformation.java

@@ -5,6 +5,7 @@
 package org.hibernate.tuple;
 
 import org.hibernate.FetchMode;
+import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.engine.spi.CascadeStyle;
 
 /**
@@ -19,6 +20,7 @@ public class BaselineAttributeInformation {
 	private final boolean nullable;
 	private final boolean dirtyCheckable;
 	private final boolean versionable;
+	private final OnDeleteAction onDeleteAction;
 	private final CascadeStyle cascadeStyle;
 	private final FetchMode fetchMode;
 
@@ -30,6 +32,7 @@ public BaselineAttributeInformation(
 			boolean dirtyCheckable,
 			boolean versionable,
 			CascadeStyle cascadeStyle,
+			OnDeleteAction onDeleteAction,
 			FetchMode fetchMode) {
 		this.lazy = lazy;
 		this.insertable = insertable;
@@ -38,6 +41,7 @@ public BaselineAttributeInformation(
 		this.dirtyCheckable = dirtyCheckable;
 		this.versionable = versionable;
 		this.cascadeStyle = cascadeStyle;
+		this.onDeleteAction = onDeleteAction;
 		this.fetchMode = fetchMode;
 	}
 
@@ -73,6 +77,10 @@ public FetchMode getFetchMode() {
 		return fetchMode;
 	}
 
+	public OnDeleteAction getOnDeleteAction() {
+		return onDeleteAction;
+	}
+
 	public static class Builder {
 		private boolean lazy;
 		private boolean insertable;
@@ -81,6 +89,7 @@ public static class Builder {
 		private boolean dirtyCheckable;
 		private boolean versionable;
 		private CascadeStyle cascadeStyle;
+		private OnDeleteAction onDeleteAction;
 		private FetchMode fetchMode;
 
 		public Builder setLazy(boolean lazy) {
@@ -118,6 +127,11 @@ public Builder setCascadeStyle(CascadeStyle cascadeStyle) {
 			return this;
 		}
 
+		public Builder setOnDeleteAction(OnDeleteAction onDeleteAction) {
+			this.onDeleteAction = onDeleteAction;
+			return this;
+		}
+
 		public Builder setFetchMode(FetchMode fetchMode) {
 			this.fetchMode = fetchMode;
 			return this;
@@ -132,6 +146,7 @@ public BaselineAttributeInformation createInformation() {
 					dirtyCheckable,
 					versionable,
 					cascadeStyle,
+					onDeleteAction,
 					fetchMode
 			);
 		}

hibernate-core/src/main/java/org/hibernate/tuple/NonIdentifierAttribute.java

@@ -5,6 +5,7 @@
 package org.hibernate.tuple;
 
 import org.hibernate.FetchMode;
+import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.engine.spi.CascadeStyle;
 
 /**
@@ -32,5 +33,7 @@ public interface NonIdentifierAttribute extends Attribute {
 
 	CascadeStyle getCascadeStyle();
 
+	OnDeleteAction getOnDeleteAction();
+
 	FetchMode getFetchMode();
 }

hibernate-core/src/main/java/org/hibernate/tuple/PropertyFactory.java

@@ -99,6 +99,7 @@ public static VersionProperty buildVersionProperty(
 						.setDirtyCheckable( property.isUpdateable() && !lazy )
 						.setVersionable( property.isOptimisticLocked() )
 						.setCascadeStyle( property.getCascadeStyle() )
+						.setOnDeleteAction( property.getOnDeleteAction() )
 						.createInformation()
 		);
 	}
@@ -169,6 +170,7 @@ public static NonIdentifierAttribute buildEntityBasedAttribute(
 								.setDirtyCheckable( alwaysDirtyCheck || property.isUpdateable() )
 								.setVersionable( property.isOptimisticLocked() )
 								.setCascadeStyle( property.getCascadeStyle() )
+								.setOnDeleteAction( property.getOnDeleteAction() )
 								.setFetchMode( property.getValue().getFetchMode() )
 								.createInformation()
 				);
@@ -188,6 +190,7 @@ public static NonIdentifierAttribute buildEntityBasedAttribute(
 								.setDirtyCheckable( alwaysDirtyCheck || property.isUpdateable() )
 								.setVersionable( property.isOptimisticLocked() )
 								.setCascadeStyle( property.getCascadeStyle() )
+								.setOnDeleteAction( property.getOnDeleteAction() )
 								.setFetchMode( property.getValue().getFetchMode() )
 								.createInformation()
 				);
@@ -209,6 +212,7 @@ public static NonIdentifierAttribute buildEntityBasedAttribute(
 								.setDirtyCheckable( alwaysDirtyCheck || property.isUpdateable() )
 								.setVersionable( property.isOptimisticLocked() )
 								.setCascadeStyle( property.getCascadeStyle() )
+								.setOnDeleteAction( property.getOnDeleteAction() )
 								.setFetchMode( property.getValue().getFetchMode() )
 								.createInformation()
 				);

hibernate-core/src/main/java/org/hibernate/tuple/StandardProperty.java

@@ -5,6 +5,7 @@
 package org.hibernate.tuple;
 
 import org.hibernate.FetchMode;
+import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.engine.spi.CascadeStyle;
 import org.hibernate.type.Type;
 
@@ -37,6 +38,7 @@ public StandardProperty(
 			boolean checkable,
 			boolean versionable,
 			CascadeStyle cascadeStyle,
+			OnDeleteAction onDeleteAction,
 			FetchMode fetchMode) {
 		super(
 				null,
@@ -52,6 +54,7 @@ public StandardProperty(
 						.setDirtyCheckable( checkable )
 						.setVersionable( versionable )
 						.setCascadeStyle( cascadeStyle )
+						.setOnDeleteAction( onDeleteAction )
 						.setFetchMode( fetchMode )
 						.createInformation()
 		);

hibernate-core/src/main/java/org/hibernate/tuple/entity/EntityMetamodel.java

@@ -18,6 +18,7 @@
 import org.hibernate.HibernateException;
 import org.hibernate.MappingException;
 import org.hibernate.annotations.NotFoundAction;
+import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.boot.spi.MetadataImplementor;
 import org.hibernate.bytecode.enhance.spi.interceptor.EnhancementHelper;
 import org.hibernate.bytecode.internal.BytecodeEnhancementMetadataNonPojoImpl;
@@ -63,6 +64,7 @@
 import static org.hibernate.internal.util.ReflectHelper.isFinalClass;
 import static org.hibernate.internal.util.collections.ArrayHelper.toIntArray;
 import static org.hibernate.internal.util.collections.CollectionHelper.toSmallSet;
+import static org.hibernate.tuple.PropertyFactory.buildIdentifierAttribute;
 
 /**
  * Centralizes metamodel information about an entity.
@@ -102,6 +104,7 @@ public class EntityMetamodel implements Serializable {
 	private final boolean[] propertyInsertability;
 	private final boolean[] propertyNullability;
 	private final boolean[] propertyVersionability;
+	private final OnDeleteAction[] propertyOnDeleteActions;
 	private final CascadeStyle[] cascadeStyles;
 	// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -162,7 +165,7 @@ public EntityMetamodel(
 			EntityPersister persister,
 			RuntimeModelCreationContext creationContext,
 			Function<String, Generator> generatorSupplier) {
-		this.sessionFactory = creationContext.getSessionFactory();
+		sessionFactory = creationContext.getSessionFactory();
 
 		// Improves performance of EntityKey#equals by avoiding content check in String#equals
 		name = persistentClass.getEntityName().intern();
@@ -174,18 +177,18 @@ public EntityMetamodel(
 		subclassId = persistentClass.getSubclassId();
 
 		final Generator idgenerator = generatorSupplier.apply( rootName );
-		identifierAttribute = PropertyFactory.buildIdentifierAttribute( persistentClass, idgenerator );
+		identifierAttribute = buildIdentifierAttribute( persistentClass, idgenerator );
 
 		versioned = persistentClass.isVersioned();
 
 		final boolean collectionsInDefaultFetchGroupEnabled =
 				creationContext.getSessionFactoryOptions().isCollectionsInDefaultFetchGroupEnabled();
+		final boolean supportsCascadeDelete = creationContext.getDialect().supportsCascadeDelete();
 
 		if ( persistentClass.hasPojoRepresentation() ) {
 			final Component identifierMapperComponent = persistentClass.getIdentifierMapper();
 			final CompositeType nonAggregatedCidMapper;
 			final Set<String> idAttributeNames;
-
 			if ( identifierMapperComponent != null ) {
 				nonAggregatedCidMapper = identifierMapperComponent.getType();
 				idAttributeNames = new HashSet<>( );
@@ -226,6 +229,7 @@ public EntityMetamodel(
 		propertyNullability = new boolean[propertySpan];
 		propertyVersionability = new boolean[propertySpan];
 		propertyLaziness = new boolean[propertySpan];
+		propertyOnDeleteActions = new OnDeleteAction[propertySpan];
 		cascadeStyles = new CascadeStyle[propertySpan];
 		// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -318,7 +322,7 @@ public EntityMetamodel(
 			nonlazyPropertyUpdateability[i] = attribute.isUpdateable() && !lazy;
 			propertyCheckability[i] = propertyUpdateability[i]
 					|| propertyType.isAssociationType() && ( (AssociationType) propertyType ).isAlwaysDirtyChecked();
-
+			propertyOnDeleteActions[i] = supportsCascadeDelete ? attribute.getOnDeleteAction() : null;
 			cascadeStyles[i] = attribute.getCascadeStyle();
 			// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -887,4 +891,8 @@ public boolean isInstrumented() {
 	public BytecodeEnhancementMetadata getBytecodeEnhancementMetadata() {
 		return bytecodeEnhancementMetadata;
 	}
+
+	public OnDeleteAction[] getPropertyOnDeleteActions() {
+		return propertyOnDeleteActions;
+	}
 }