HHH-17832 Add test for issue

Author: mbellade

hibernate-core/src/test/java/org/hibernate/orm/test/inheritance/JoinedInheritanceCircularBiDirectionalFetchTest.java

@@ -0,0 +1,151 @@
+/*
+ * 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.inheritance;
+
+import java.util.LinkedList;
+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.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.Inheritance;
+import jakarta.persistence.InheritanceType;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Marco Belladelli
+ */
+@DomainModel( annotatedClasses = {
+		JoinedInheritanceCircularBiDirectionalFetchTest.Animal.class,
+		JoinedInheritanceCircularBiDirectionalFetchTest.Cat.class,
+		JoinedInheritanceCircularBiDirectionalFetchTest.Leg.class,
+} )
+@SessionFactory
+@Jira( "https://hibernate.atlassian.net/browse/HHH-17832" )
+public class JoinedInheritanceCircularBiDirectionalFetchTest {
+	@Test
+	public void testJoinSelectCat(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final Cat result = session.createQuery(
+					"select cat from Cat cat join cat.legs leg",
+					Cat.class
+			).getSingleResult();
+			assertThat( result.getName() ).isEqualTo( "gatta" );
+			assertThat( result.getLegs() ).hasSize( 2 ).extracting( Leg::getCat ).containsOnly( result );
+		} );
+	}
+
+	@Test
+	public void testJoinSelectLeg(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final List<Leg> resultList = session.createQuery(
+					"select leg from Cat cat join cat.legs leg",
+					Leg.class
+			).getResultList();
+			assertThat( resultList )
+					.hasSize( 2 ).allMatch( l -> Hibernate.isInitialized( l.getCat() ) )
+					.extracting( Leg::getCat ).containsOnly( resultList.get( 0 ).getCat() )
+					.extracting( Cat::getName ).containsOnly( "gatta" );
+		} );
+	}
+
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final Leg leg1 = new Leg( "leg1" );
+			final Leg leg2 = new Leg( "leg2" );
+			final Cat cat = new Cat();
+			cat.setName( "gatta" );
+			cat.addToLegs( leg1 );
+			cat.addToLegs( leg2 );
+			session.persist( cat );
+		} );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			session.createMutationQuery( "delete from Leg" ).executeUpdate();
+			session.createMutationQuery( "delete from Animal" ).executeUpdate();
+		} );
+	}
+
+	@Entity( name = "Animal" )
+	@Inheritance( strategy = InheritanceType.JOINED )
+	public static class Animal {
+		@Id
+		@GeneratedValue
+		protected Long id;
+
+		protected String name;
+
+		public long getId() {
+			return id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+
+	@Entity( name = "Cat" )
+	public static class Cat extends Animal {
+		@OneToMany( mappedBy = "cat", cascade = CascadeType.PERSIST )
+		private List<Leg> legs = new LinkedList<>();
+
+		public List<Leg> getLegs() {
+			return this.legs;
+		}
+
+		public void addToLegs(Leg person) {
+			legs.add( person );
+			person.cat = this;
+		}
+	}
+
+	@Entity( name = "Leg" )
+	public static class Leg {
+		@Id
+		@GeneratedValue
+		private long id;
+
+		@ManyToOne( fetch = FetchType.LAZY )
+		private Cat cat;
+
+		private String name;
+
+		public Leg() {
+		}
+
+		public Leg(String name) {
+			this.name = name;
+		}
+
+		public Cat getCat() {
+			return cat;
+		}
+	}
+}