HHH-17173 Add a test case to reproduce the issue

hibernate-core/src/test/java/org/hibernate/orm/test/bytecode/enhancement/association/OneToOnEnhancedEntityLoadedAsReferenceTest.java

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+/*
+ * 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.bytecode.enhancement.association;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
+
+import org.hibernate.Hibernate;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.cfg.Configuration;
+
+import org.hibernate.testing.bytecode.enhancement.BytecodeEnhancerRunner;
+import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
+
+@JiraKey("HHH-17173")
+@RunWith(BytecodeEnhancerRunner.class)
+public class OneToOnEnhancedEntityLoadedAsReferenceTest extends BaseCoreFunctionalTestCase {
+
+	private long entityId;
+	private long entityId2;
+	private long containedEntityId;
+
+	@Override
+	public Class<?>[] getAnnotatedClasses() {
+		return new Class<?>[] { ContainingEntity.class, ContainedEntity.class };
+	}
+
+	@Override
+	protected void configure(Configuration configuration) {
+		configuration.setProperty( AvailableSettings.DEFAULT_BATCH_FETCH_SIZE, "10" );
+		configuration.setProperty( AvailableSettings.MAX_FETCH_DEPTH, "0" );
+	}
+
+	@Before
+	public void prepare() {
+		doInJPA( this::sessionFactory, em -> {
+			ContainingEntity entity = new ContainingEntity();
+			ContainedEntity containedEntity = new ContainedEntity();
+			containedEntity.setValue( "value" );
+			entity.setContained( containedEntity );
+			containedEntity.setContaining( entity );
+
+			em.persist( entity );
+			em.persist( containedEntity );
+			entityId = entity.getId();
+			containedEntityId = containedEntity.getId();
+
+			ContainingEntity entity2 = new ContainingEntity();
+			em.persist( entity2 );
+			entityId2 = entity2.getId();
+		} );
+	}
+
+	@Test
+	public void test() {
+		doInJPA( this::sessionFactory, em -> {
+			ContainingEntity entity2 = em.getReference( ContainingEntity.class, entityId2 );
+			ContainingEntity entity = em.getReference( ContainingEntity.class, entityId );
+			ContainedEntity containedEntity = em.getReference( ContainedEntity.class, containedEntityId );
+			// We're working on an uninitialized proxy.
+			assertThat( entity ).returns( false, Hibernate::isInitialized );
+			// The above should have persisted a value that passes the assertion.
+			assertThat( entity.getContained() ).isEqualTo( containedEntity );
+			assertThat( entity.getContained().getValue() ).isEqualTo( "value" );
+			// Accessing the value should trigger initialization of the proxy.
+			assertThat( entity ).returns( true, Hibernate::isInitialized );
+		} );
+	}
+
+	@Entity(name = "ContainingEntity")
+	public static class ContainingEntity {
+
+		@Id
+		@GeneratedValue
+		public long id;
+
+		@OneToOne(mappedBy = "containing")
+		private ContainedEntity contained;
+
+		public long getId() {
+			return id;
+		}
+
+		public void setId(long id) {
+			this.id = id;
+		}
+
+		public ContainedEntity getContained() {
+			return contained;
+		}
+
+		public void setContained(ContainedEntity oneToOneMappedBy) {
+			this.contained = oneToOneMappedBy;
+		}
+	}
+
+	@Entity(name = "ContainedEntity")
+	public static class ContainedEntity {
+
+		@Id
+		@GeneratedValue
+		private long id;
+
+		@Column(name = "value_")
+		private String value;
+
+		@OneToOne
+		private ContainingEntity containing;
+
+		public long getId() {
+			return id;
+		}
+
+		public void setId(long id) {
+			this.id = id;
+		}
+
+		public String getValue() {
+			return value;
+		}
+
+		public void setValue(String value) {
+			this.value = value;
+		}
+
+		public ContainingEntity getContaining() {
+			return containing;
+		}
+
+		public void setContaining(ContainingEntity oneToOne) {
+			this.containing = oneToOne;
+		}
+
+	}
+}