HHH-17925 Add test for issue

Author: mbellade

hibernate-core/src/test/java/org/hibernate/orm/test/mapping/manytomany/ManyToManyNonAggregatedIdJoinColumnTest.java

@@ -0,0 +1,141 @@
+/*
+ * 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.manytomany;
+
+import java.util.ArrayList;
+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.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.JoinTable;
+import jakarta.persistence.ManyToMany;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Marco Belladelli
+ */
+@DomainModel( annotatedClasses = {
+		ManyToManyNonAggregatedIdJoinColumnTest.EntityA.class,
+		ManyToManyNonAggregatedIdJoinColumnTest.EntityB.class,
+} )
+@SessionFactory
+@Jira( "https://hibernate.atlassian.net/browse/HHH-17925" )
+public class ManyToManyNonAggregatedIdJoinColumnTest {
+	@Test
+	public void testMapping(SessionFactoryScope scope) {
+		scope.inSession( session -> {
+			final EntityA entityA = session.createQuery( "from EntityA where id = 1", EntityA.class ).getSingleResult();
+			assertThat( entityA.getEntityBList() ).hasSize( 2 )
+					.extracting( EntityB::getName )
+					.containsOnly( "entityb_1", "entityb_2" );
+			assertThat( session.createQuery( "from EntityA where id = 2", EntityA.class ).getSingleResult().getEntityBList() ).isEmpty();
+		} );
+	}
+
+	@Test
+	public void testQueryFunctions(SessionFactoryScope scope) {
+		scope.inSession( session -> {
+			final EntityA entityA = session.createQuery(
+					"from EntityA e join fetch e.entityBList where e.id = 1",
+					EntityA.class
+			).getSingleResult();
+			assertThat( entityA.getEntityBList() ).matches(
+							Hibernate::isInitialized,
+							"Expected join-fetched list to be initialized"
+					)
+					.hasSize( 2 )
+					.extracting( EntityB::getName )
+					.containsOnly( "entityb_1", "entityb_2" );
+		} );
+		scope.inSession( session -> {
+			assertThat( session.createQuery(
+					"select size(e.entityBList) from EntityA e where e.id = 2",
+					Integer.class
+			).getSingleResult() ).isEqualTo( 0 );
+		} );
+	}
+
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final EntityA entityA = new EntityA( 1L, "entitya_1" );
+			entityA.getEntityBList().add( new EntityB( 1L, "entityb_1" ) );
+			entityA.getEntityBList().add( new EntityB( 2L, "entityb_2" ) );
+			session.persist( entityA );
+			session.persist( new EntityA( 2L, "entitya_2" ) );
+		} );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			session.createMutationQuery( "delete from EntityA" ).executeUpdate();
+			session.createMutationQuery( "delete from EntityB" ).executeUpdate();
+		} );
+	}
+
+	@Entity( name = "EntityA" )
+	static class EntityA {
+		@Id
+		private Long id;
+
+		@Id
+		private String name;
+
+		@ManyToMany( cascade = CascadeType.ALL )
+		@JoinTable(
+				name = "a_b_table",
+				joinColumns = @JoinColumn( name = "entitya_id", referencedColumnName = "id" ),
+				inverseJoinColumns = @JoinColumn( name = "entityb_id", referencedColumnName = "id" ) )
+		private List<EntityB> entityBList = new ArrayList<>();
+
+		public EntityA() {
+		}
+
+		public EntityA(Long id, String name) {
+			this.id = id;
+			this.name = name;
+		}
+
+		public List<EntityB> getEntityBList() {
+			return entityBList;
+		}
+	}
+
+	@Entity( name = "EntityB" )
+	static class EntityB {
+		@Id
+		private Long id;
+
+		private String name;
+
+		public EntityB() {
+		}
+
+		public EntityB(Long id, String name) {
+			this.id = id;
+			this.name = name;
+		}
+
+		public String getName() {
+			return name;
+		}
+	}
+}