HHH-16664 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/idclass/IdClassWithSuperclassTest.java

@@ -0,0 +1,90 @@
+package org.hibernate.orm.test.annotations.idclass;
+
+import java.io.Serializable;
+
+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.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.IdClass;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+@DomainModel(
+		annotatedClasses = { IdClassWithSuperclassTest.MyEntity.class }
+)
+@SessionFactory
+@JiraKey("HHH-16664")
+public class IdClassWithSuperclassTest {
+
+	@Test
+	public void testSaveAndGet(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					MyEntity myEntity = new MyEntity( 1, 2 );
+					session.persist( myEntity );
+				}
+		);
+
+		scope.inTransaction(
+				session -> {
+					MyEntity myEntity = session.get( MyEntity.class, new ChildPrimaryKey(  1, 2 ) );
+					assertThat( myEntity ).isNotNull();
+				}
+		);
+	}
+
+	public static class ParentPrimaryKey implements Serializable {
+		private Integer parentId;
+
+		public ParentPrimaryKey() {
+		}
+
+		public ParentPrimaryKey(Integer parentId) {
+			this.parentId = parentId;
+		}
+	}
+
+	public static class ChildPrimaryKey extends ParentPrimaryKey{
+		private Integer childId;
+
+		public ChildPrimaryKey() {
+		}
+
+		public ChildPrimaryKey(Integer parentId, Integer childId) {
+			super(parentId);
+			this.childId = childId;
+		}
+	}
+
+	@Entity
+	@IdClass(ChildPrimaryKey.class)
+	public static class MyEntity {
+
+		@Id
+		private Integer parentId;
+
+		@Id
+		private Integer childId;
+
+		public MyEntity() {
+		}
+
+		public MyEntity(Integer parentId, Integer childId) {
+			this.parentId = parentId;
+			this.childId = childId;
+		}
+
+		public Integer getParentId() {
+			return parentId;
+		}
+
+		public Integer getChildId() {
+			return childId;
+		}
+	}
+}