HHH-17783 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/mapping/manytoone/ManyToOneBidirectionalEagerTest.java

@@ -0,0 +1,216 @@
+/*
+ * 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.manytoone;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+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.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
+
+import static jakarta.persistence.CascadeType.ALL;
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Marco Belladelli
+ */
+@DomainModel( annotatedClasses = {
+		ManyToOneBidirectionalEagerTest.OneEntity.class,
+		ManyToOneBidirectionalEagerTest.ManyEntity.class,
+} )
+@SessionFactory
+@Jira( "https://hibernate.atlassian.net/browse/HHH-17783" )
+public class ManyToOneBidirectionalEagerTest {
+	@Test
+	public void testQueryOneEntity(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final OneEntity result = session.createQuery(
+					"from OneEntity o",
+					OneEntity.class
+			).getSingleResult();
+			assertThat( result.getMany() ).hasSize( 2 );
+			result.getMany().forEach( m -> assertThat( m.getOne() ).isSameAs( result ) );
+		} );
+	}
+
+	@Test
+	public void testFindOneEntity(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final OneEntity result = session.find( OneEntity.class, 1L );
+			assertThat( result.getMany() ).hasSize( 2 );
+			result.getMany().forEach( m -> assertThat( m.getOne() ).isSameAs( result ) );
+		} );
+	}
+
+	@Test
+	public void testQueryManyEntity(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final List<ManyEntity> resultList = session.createQuery(
+					"from ManyEntity m where m.id in ('a','b')",
+					ManyEntity.class
+			).getResultList();
+			assertThat( resultList ).hasSize( 2 );
+			final OneEntity one = resultList.get( 0 ).getOne();
+			assertThat( one ).isSameAs( resultList.get( 1 ).getOne() );
+			assertThat( one.getMany() ).containsAll( resultList );
+		} );
+	}
+
+	@Test
+	public void testFindManyEntity(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final ManyEntity a = session.find( ManyEntity.class, "a" );
+			final ManyEntity b = session.find( ManyEntity.class, "b" );
+			final OneEntity one = a.getOne();
+			assertThat( one ).isSameAs( b.getOne() );
+			assertThat( one.getMany() ).containsOnly( a, b );
+		} );
+	}
+
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final ManyEntity many1 = new ManyEntity( "a", "many_1" );
+			final ManyEntity many2 = new ManyEntity( "b", "many_2" );
+			final OneEntity one = new OneEntity( 1L, "one_1" );
+			one.addMany( many1 );
+			one.addMany( many2 );
+			session.persist( one );
+		} );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			session.createMutationQuery( "delete from ManyEntity" ).executeUpdate();
+			session.createMutationQuery( "delete from OneEntity" ).executeUpdate();
+		} );
+	}
+
+	@Entity( name = "ManyEntity" )
+	public static class ManyEntity {
+		@Id
+		private String id;
+
+		@Column( nullable = false )
+		private String description;
+
+		@ManyToOne
+		@JoinColumn( name = "one_id" )
+		private OneEntity one;
+
+		public ManyEntity(String id, String description) {
+			this.id = id;
+			this.description = description;
+		}
+
+		public ManyEntity() {
+		}
+
+		public String getId() {
+			return id;
+		}
+
+		public String getDescription() {
+			return description;
+		}
+
+		public OneEntity getOne() {
+			return one;
+		}
+
+		public void setOne(OneEntity one) {
+			this.one = one;
+		}
+
+		@Override
+		public boolean equals(Object o) {
+			if ( this == o ) {
+				return true;
+			}
+			if ( o == null || getClass() != o.getClass() ) {
+				return false;
+			}
+			final ManyEntity that = (ManyEntity) o;
+			return Objects.equals( id, that.id ) && Objects.equals( description, that.description );
+		}
+
+		@Override
+		public int hashCode() {
+			return Objects.hash( id, description );
+		}
+	}
+
+	@Entity( name = "OneEntity" )
+	public static class OneEntity {
+		@Id
+		private Long id;
+
+		@Column( nullable = false )
+		private String description;
+
+		@OneToMany( mappedBy = "one", cascade = { ALL }, fetch = FetchType.EAGER )
+		private Set<ManyEntity> many = new HashSet<>();
+
+		public OneEntity(Long id, String description) {
+			this.id = id;
+			this.description = description;
+		}
+
+		public OneEntity() {
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		public String getDescription() {
+			return description;
+		}
+
+		public Set<ManyEntity> getMany() {
+			return many;
+		}
+
+		public void addMany(ManyEntity newMany) {
+			many.add( newMany );
+			newMany.setOne( this );
+		}
+
+		@Override
+		public boolean equals(Object o) {
+			if ( this == o ) {
+				return true;
+			}
+			if ( o == null || getClass() != o.getClass() ) {
+				return false;
+			}
+			final OneEntity that = (OneEntity) o;
+			return Objects.equals( id, that.id ) && Objects.equals( description, that.description );
+		}
+
+		@Override
+		public int hashCode() {
+			return Objects.hash( id, description );
+		}
+	}
+}