HHH-18469 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/query/joinfetch/JoinFetchNestedAssociationsTest.java

@@ -0,0 +1,181 @@
+/*
+ * 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.query.joinfetch;
+
+import java.util.HashSet;
+import java.util.Set;
+
+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.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.MappedSuperclass;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.OneToOne;
+import jakarta.persistence.Table;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Marco Belladelli
+ */
+@DomainModel( annotatedClasses = {
+		JoinFetchNestedAssociationsTest.AEntity.class,
+		JoinFetchNestedAssociationsTest.BaseBEntity.class,
+		JoinFetchNestedAssociationsTest.B1Entity.class,
+		JoinFetchNestedAssociationsTest.B2Entity.class,
+		JoinFetchNestedAssociationsTest.CEntity.class,
+} )
+@SessionFactory
+@Jira( "https://hibernate.atlassian.net/browse/HHH-18469" )
+public class JoinFetchNestedAssociationsTest {
+	@Test
+	public void test(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final AEntity result = session.createQuery(
+					"select a from AEntity a " +
+							"left join fetch a.b_entity b_join " +
+							"left join fetch b_join.c_entities c",
+					AEntity.class
+			).getSingleResult();
+			final B2Entity bEntity = result.getB_entity();
+			assertThat( bEntity ).matches( Hibernate::isInitialized );
+			assertThat( bEntity.getC_entities() ).matches( Hibernate::isInitialized )
+					.hasSize( 1 )
+					.allMatch( c -> c.getName().equals( "c_entity" ) );
+		} );
+	}
+
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			// B1 or B2 doesn't matter as they map to the same table
+			final B1Entity b = new B1Entity();
+			b.setId( 1L );
+			session.persist( b );
+			session.flush();
+
+			final AEntity a = new AEntity();
+			a.setB_entity_id( 1L );
+			final CEntity c = new CEntity();
+			c.setbEntityId( 1L );
+			c.setName( "c_entity" );
+			session.persist( a );
+			session.persist( c );
+		} );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.getSessionFactory().getSchemaManager().truncateMappedObjects();
+	}
+
+	@Entity( name = "AEntity" )
+	static class AEntity {
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		@OneToOne
+		@JoinColumn( name = "b_entity_id", updatable = false, insertable = false )
+		private B2Entity b_entity;
+
+		@Column( name = "b_entity_id" )
+		private Long b_entity_id;
+
+		public B2Entity getB_entity() {
+			return b_entity;
+		}
+
+		public Long getB_entity_id() {
+			return b_entity_id;
+		}
+
+		public void setB_entity_id(Long b_entity_id) {
+			this.b_entity_id = b_entity_id;
+		}
+	}
+
+	@MappedSuperclass
+	static class BaseBEntity {
+		@Id
+		private Long id;
+
+		@OneToMany( mappedBy = "b_entity" )
+		private Set<CEntity> c_entities = new HashSet<>();
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public Set<CEntity> getC_entities() {
+			return c_entities;
+		}
+	}
+
+	@Entity( name = "B1Entity" )
+	@Table( name = "b_entities" )
+	static class B1Entity extends BaseBEntity {
+	}
+
+	@Entity( name = "B2Entity" )
+	@Table( name = "b_entities" )
+	static class B2Entity extends BaseBEntity {
+	}
+
+	@Entity( name = "CEntity" )
+	static class CEntity {
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		@Column( name = "b_id" )
+		private Long bEntityId;
+
+		@ManyToOne
+		@JoinColumn( name = "b_id", updatable = false, insertable = false )
+		private B1Entity b_entity;
+
+		private String name;
+
+		public Long getbEntityId() {
+			return bEntityId;
+		}
+
+		public void setbEntityId(Long bEntityId) {
+			this.bEntityId = bEntityId;
+		}
+
+		public B1Entity getB_entity() {
+			return b_entity;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+}