HHH-15970 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/generics/MappedSuperclassAndGenericsTest.java

@@ -0,0 +1,90 @@
+package org.hibernate.orm.test.annotations.generics;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.orm.junit.DomainModel;
+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.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
+
+@DomainModel(
+		annotatedClasses = {
+				MappedSuperclassAndGenericsTest.RawEntity.class,
+				MappedSuperclassAndGenericsTest.LongEntity.class
+		}
+)
+@SessionFactory
+@TestForIssue( jiraKey = "HHH-15970")
+public class MappedSuperclassAndGenericsTest {
+
+	public enum MyEnum {
+		A, B
+	}
+
+	@Test
+	public void testIt(SessionFactoryScope scope){
+		scope.inTransaction(
+			session -> {
+
+			}
+		);
+	}
+
+	@MappedSuperclass
+	public static abstract class ParameterizedParent<L> {
+
+		@Enumerated(EnumType.STRING)
+		private MyEnum myEnum;
+
+		public MyEnum getMyEnum() {
+			return myEnum;
+		}
+
+		public void setMyEnum(MyEnum myEnum) {
+			this.myEnum = myEnum;
+		}
+
+	}
+
+	@Entity(name = "RawEntity")
+	public static class RawEntity extends ParameterizedParent {
+		@Id
+		@GeneratedValue(strategy = GenerationType.SEQUENCE)
+		@Column(name = "id", nullable = false)
+		private Long id;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+	}
+
+	@Entity(name = "LongEntity")
+	public static class LongEntity extends ParameterizedParent<Long> {
+		@Id
+		@GeneratedValue(strategy = GenerationType.SEQUENCE)
+		@Column(name = "id", nullable = false)
+		private Long id;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+	}
+
+}