HHH-17621 Add test for issue

Author: dreab8

hibernate-core/src/test/java/org/hibernate/orm/test/any/annotations/AnyMergeTest.java

@@ -0,0 +1,145 @@
+package org.hibernate.orm.test.any.annotations;
+
+import java.math.BigDecimal;
+
+import org.hibernate.annotations.Any;
+import org.hibernate.annotations.AnyDiscriminator;
+import org.hibernate.annotations.AnyDiscriminatorValue;
+import org.hibernate.annotations.AnyKeyJavaClass;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.DiscriminatorType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.OneToOne;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+@DomainModel(
+		annotatedClasses = {
+				AnyMergeTest.InvoicePosition.class,
+				AnyMergeTest.Bonus.class,
+				AnyMergeTest.Fee.class,
+				AnyMergeTest.Amount.class
+		}
+)
+@SessionFactory
+@JiraKey("HHH-17621")
+public class AnyMergeTest {
+
+
+	@Test
+	public void testMerge(SessionFactoryScope scope) {
+		Amount amount = new Amount( new BigDecimal( 10 ) );
+		Bonus bonus = new Bonus( "that's a bonus", amount );
+		scope.inTransaction(
+				session -> {
+					session.persist( amount );
+					session.persist( bonus );
+				}
+		);
+
+		scope.inTransaction(
+				session -> {
+					InvoicePosition invoicePosition = new InvoicePosition();
+					invoicePosition.setReference( bonus );
+					InvoicePosition merged = session.merge( invoicePosition );
+
+					Reference mergedReference = merged.getReference();
+					assertThat( mergedReference ).isExactlyInstanceOf( Bonus.class );
+					Bonus mergedBonus = (Bonus) mergedReference;
+					// check the merged values are copies of the original ones
+					assertThat( mergedBonus ).isNotEqualTo( bonus );
+					assertThat( mergedBonus.amount ).isNotEqualTo( amount );
+
+					assertThat( mergedBonus.amount.quantity.compareTo( new BigDecimal( 10 ) ) ).isEqualTo( 0 );
+				}
+		);
+	}
+
+	public interface Reference {
+	}
+
+	@Entity(name = "Bonus")
+	public static class Bonus implements Reference {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private String name;
+
+		@OneToOne
+		private Amount amount;
+
+		public Bonus() {
+		}
+
+		public Bonus(String name, Amount amount) {
+			this.name = name;
+			this.amount = amount;
+		}
+	}
+
+	@Entity(name = "Amount")
+	public static class Amount {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private BigDecimal quantity;
+
+		public Amount() {
+		}
+
+		public Amount(BigDecimal quantity) {
+			this.quantity = quantity;
+		}
+	}
+
+	@Entity(name = "Fee")
+	public static class Fee implements Reference {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private String name;
+	}
+
+	@Entity(name = "InvoicePosition")
+	public static class InvoicePosition {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		@Any
+		@AnyDiscriminator(DiscriminatorType.STRING)
+		@AnyDiscriminatorValue(discriminator = "BONUS", entity = Bonus.class)
+		@AnyDiscriminatorValue(discriminator = "FEE", entity = Fee.class)
+		@AnyKeyJavaClass(Long.class)
+		@Column(name = "Type")
+		@JoinColumn(name = "ReferenceId")
+		private Reference reference;
+
+		public Reference getReference() {
+			return reference;
+		}
+
+		public void setReference(Reference reference) {
+			this.reference = reference;
+		}
+	}
+
+
+}