HHH-18330 Add test for issue

Author: mbellade

hibernate-core/src/test/java/org/hibernate/orm/test/mapping/identifier/EmbeddedIdManyToOneFetchTest.java

@@ -0,0 +1,170 @@
+/*
+ * 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.mapping.identifier;
+
+import java.util.List;
+
+import org.hibernate.Hibernate;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.Jira;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.EmbeddedId;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Marco Belladelli
+ */
+@DomainModel( annotatedClasses = {
+		EmbeddedIdManyToOneFetchTest.EntityC.class,
+		EmbeddedIdManyToOneFetchTest.EntityA.class,
+		EmbeddedIdManyToOneFetchTest.EntityB.class,
+		EmbeddedIdManyToOneFetchTest.AnotherEntity.class,
+} )
+@SessionFactory
+@Jira( "https://hibernate.atlassian.net/browse/HHH-18330" )
+public class EmbeddedIdManyToOneFetchTest {
+	@Test
+	public void testInnerJoinFetch(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final EntityA result = session.createQuery(
+					"select a from EntityA a " +
+							"join fetch a.id.entityB b " +
+							"join fetch b.id.entityC c", EntityA.class ).getSingleResult();
+			final EntityB entityB = result.id.entityB;
+			assertThat( entityB ).satisfies( Hibernate::isInitialized );
+			assertThat( entityB.id.entityC ).satisfies( Hibernate::isInitialized );
+		} );
+	}
+
+	@Test
+	public void testLeftJoinFetch(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final EntityA result = session.createQuery(
+					"select a from EntityA a " +
+							"left join fetch a.id.entityB b " +
+							"left join fetch b.id.entityC c", EntityA.class ).getSingleResult();
+			final EntityB entityB = result.id.entityB;
+			assertThat( entityB ).satisfies( Hibernate::isInitialized );
+			assertThat( entityB.id.entityC ).satisfies( Hibernate::isInitialized );
+		} );
+	}
+
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final EntityC entityC = new EntityC( "entity_c" );
+			session.persist( entityC );
+			final EntityB entityB = new EntityB( new EntityBId( entityC, "entity_b" ) );
+			session.persist( entityB );
+			final AnotherEntity anotherEntity = new AnotherEntity( 1L );
+			session.persist( anotherEntity );
+			session.persist( new EntityA( new EntityAId( entityB, anotherEntity ) ) );
+		} );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction( session -> session.getSessionFactory().getSchemaManager().truncateMappedObjects() );
+	}
+
+	@Entity( name = "EntityA" )
+	static class EntityA {
+		@EmbeddedId
+		private EntityAId id;
+
+		public EntityA() {
+		}
+
+		public EntityA(EntityAId id) {
+			this.id = id;
+		}
+	}
+
+	@Embeddable
+	static class EntityAId {
+		@ManyToOne( fetch = FetchType.LAZY )
+		private EntityB entityB;
+
+		@ManyToOne( fetch = FetchType.LAZY )
+		private AnotherEntity anotherEntity;
+
+		public EntityAId() {
+		}
+
+		public EntityAId(EntityB entityB, AnotherEntity anotherEntity) {
+			this.entityB = entityB;
+			this.anotherEntity = anotherEntity;
+		}
+	}
+
+	@Entity( name = "EntityB" )
+	static class EntityB {
+		@EmbeddedId
+		private EntityBId id;
+
+		public EntityB() {
+		}
+
+		public EntityB(EntityBId id) {
+			this.id = id;
+		}
+	}
+
+	@Embeddable
+	static class EntityBId {
+		@ManyToOne( fetch = FetchType.LAZY )
+		private EntityC entityC;
+
+		private String name;
+
+		public EntityBId() {
+		}
+
+		public EntityBId(EntityC entityC, String name) {
+			this.entityC = entityC;
+			this.name = name;
+		}
+	}
+
+	@Entity( name = "EntityC" )
+	static class EntityC {
+		@Id
+		private String id;
+
+		public EntityC() {
+		}
+
+		public EntityC(String id) {
+			this.id = id;
+		}
+	}
+
+	@Entity( name = "AnotherEntity" )
+	static class AnotherEntity {
+		@Id
+		private Long id;
+
+		public AnotherEntity() {
+		}
+
+		public AnotherEntity(Long id) {
+			this.id = id;
+		}
+	}
+}