HHH-19206 Test mutating id verifying it doesn't trigger dirty tracking

hibernate-core/src/test/java/org/hibernate/orm/test/bytecode/enhancement/dirty/DirtyTrackingIdTest.java

@@ -0,0 +1,114 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.bytecode.enhancement.dirty;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.EmbeddedId;
+import jakarta.persistence.Entity;
+import org.hibernate.testing.bytecode.enhancement.EnhancementOptions;
+import org.hibernate.testing.bytecode.enhancement.extension.BytecodeEnhanced;
+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 java.util.Objects;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@JiraKey("HHH-19206")
+@DomainModel(
+		annotatedClasses = {
+				DirtyTrackingIdTest.MyEntity.class
+		}
+)
+@SessionFactory
+@BytecodeEnhanced
+@EnhancementOptions(lazyLoading = true, inlineDirtyChecking = true, extendedEnhancement = true)
+public class DirtyTrackingIdTest {
+
+	@Test
+	public void test(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			MyEntity myEntity = new MyEntity();
+			myEntity.setAnId( new MyEntityId( 1L ) );
+			myEntity.setData( "initial" );
+			session.persist( myEntity );
+
+			// This is unnecessary, but should be harmless...
+			// Unfortunately it causes dirty checking to misbehave.
+			// Comment it, and the test will pass.
+			myEntity.setAnId( new MyEntityId( 1L ) );
+
+			myEntity.setData( "updated" );
+		} );
+		scope.inTransaction( session -> {
+			var entityFromDb = session.find( MyEntity.class, new MyEntityId( 1L ) );
+			assertThat( entityFromDb.getData() ).isEqualTo( "updated" );
+		} );
+	}
+
+	// --- //
+
+	@Entity(name = "MyEntity")
+	public static class MyEntity {
+		// The name of this property must be (alphabetically) before the name of "data" to trigger the bug.
+		// Yes, it's weird.
+		@EmbeddedId
+		private MyEntityId anId;
+		private String data;
+
+		public void setAnId(MyEntityId id) {
+			this.anId = id;
+		}
+
+		public MyEntityId getAnId() {
+			return anId;
+		}
+
+		public String getData() {
+			return data;
+		}
+
+		public void setData(String name) {
+			this.data = name;
+		}
+	}
+
+	@Embeddable
+	public static class MyEntityId {
+		private Long id;
+
+		public MyEntityId() {
+		}
+
+		public MyEntityId(Long id) {
+			this.id = id;
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		@Override
+		public final boolean equals(Object o) {
+			if ( !(o instanceof MyEntityId) ) {
+				return false;
+			}
+
+			return Objects.equals( id, ( (MyEntityId) o ).id );
+		}
+
+		@Override
+		public int hashCode() {
+			return Objects.hashCode( id );
+		}
+	}
+}