HHH-18730 Multi-column association in aggregate component doesn't work

hibernate-core/src/main/java/org/hibernate/dialect/StructHelper.java

@@ -12,6 +12,7 @@ import java.sql.Clob;
 import java.sql.NClob;
 import java.sql.SQLException;
 
+import org.checkerframework.checker.nullness.qual.Nullable;
 import org.hibernate.Internal;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.metamodel.mapping.BasicValuedMapping;
@@ -130,13 +131,13 @@ public class StructHelper {
 
 	private static int injectJdbcValues(
 			EmbeddableMappingType embeddableMappingType,
-			Object domainValue,
+			@Nullable Object domainValue,
 			Object[] jdbcValues,
 			int jdbcIndex,
 			WrapperOptions options) throws SQLException {
 		return injectJdbcValues(
 				embeddableMappingType,
-				embeddableMappingType.getValues( domainValue ),
+				domainValue == null ? null : embeddableMappingType.getValues( domainValue ),
 				jdbcValues,
 				jdbcIndex,
 				options
@@ -145,12 +146,15 @@ public class StructHelper {
 
 	private static int injectJdbcValues(
 			EmbeddableMappingType embeddableMappingType,
-			Object[] values,
+			@Nullable Object[] values,
 			Object[] jdbcValues,
 			int jdbcIndex,
 			WrapperOptions options) throws SQLException {
 		final int jdbcValueCount = embeddableMappingType.getJdbcValueCount();
 		final int valueCount = jdbcValueCount + ( embeddableMappingType.isPolymorphic() ? 1 : 0 );
+		if ( values == null ) {
+			return valueCount;
+		}
 		int offset = 0;
 		for ( int i = 0; i < values.length; i++ ) {
 			offset += injectJdbcValue(
@@ -255,23 +259,14 @@ public class StructHelper {
 						);
 			}
 			else {
-				jdbcValueCount = embeddableMappingType.getJdbcValueCount() + ( embeddableMappingType.isPolymorphic() ? 1 : 0 );
-				final int numberOfAttributeMappings = embeddableMappingType.getNumberOfAttributeMappings();
-				final int numberOfValues = numberOfAttributeMappings + ( embeddableMappingType.isPolymorphic() ? 1 : 0 );
-				final Object[] subValues = embeddableMappingType.getValues( attributeValues[attributeIndex] );
-				int offset = 0;
-				for ( int i = 0; i < numberOfValues; i++ ) {
-					offset += injectJdbcValue(
-							getEmbeddedPart( embeddableMappingType, i ),
-							subValues,
-							i,
+				jdbcValueCount = injectJdbcValues(
+						embeddableMappingType,
+						attributeValues[attributeIndex],
 						jdbcValues,
-							jdbcIndex + offset,
+						jdbcIndex,
 						options
 				);
 			}
-				assert offset == jdbcValueCount;
-			}
 		}
 		else {
 			assert attributeMapping.getJdbcTypeCount() == 1;

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentManyToOneCompositeTest.java

@@ -0,0 +1,175 @@
+/*
+ * 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.component;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Struct;
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+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.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentManyToOneCompositeTest.Book.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentManyToOneCompositeTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book1 = new Book();
+					book1.id = 1L;
+					book1.id2 = 1L;
+					book1.title = "Hibernate 3";
+					book1.author = new Author( "Gavin", null );
+
+					session.persist( book1 );
+
+					Book book2 = new Book();
+					book2.id = 2L;
+					book2.id2 = 2L;
+					book2.title = "Hibernate 6";
+					book2.author = new Author( "Steve", book1 );
+
+					session.persist( book2 );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from Book" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b where b.id = 2", Book.class ).getSingleResult();
+					assertFalse( Hibernate.isInitialized( book.author.getFavoriteBook() ) );
+					assertEquals( "Gavin", book.author.getFavoriteBook().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Test
+	public void testJoin(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery(
+							"from Book b join fetch b.author.favoriteBook where b.id = 2",
+							Book.class
+					).getSingleResult();
+					assertTrue( Hibernate.isInitialized( book.author.getFavoriteBook() ) );
+					assertEquals( "Gavin", book.author.getFavoriteBook().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		@Id
+		private Long id2;
+		private String title;
+		private Author author;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public Long getId2() {
+			return id2;
+		}
+
+		public void setId2(Long id2) {
+			this.id2 = id2;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@ManyToOne(fetch = FetchType.LAZY)
+		private Book favoriteBook;
+
+		public Author() {
+		}
+
+		public Author(String name, Book favoriteBook) {
+			this.name = name;
+			this.favoriteBook = favoriteBook;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Book getFavoriteBook() {
+			return favoriteBook;
+		}
+
+		public void setFavoriteBook(Book favoriteBook) {
+			this.favoriteBook = favoriteBook;
+		}
+	}
+
+}