HHH-19899 : [Reproducer test] Proxy generation fails with @ConcreteProxy and sealed abstract entities

hibernate-core/src/test/java/org/hibernate/orm/test/proxy/concrete/ConcreteProxyWithSealedClassesTest.java

@@ -0,0 +1,59 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.proxy.concrete;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import org.hibernate.annotations.ConcreteProxy;
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.hibernate.testing.orm.junit.Setting;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests the compatibility of Hibernate {@code @ConcreteProxy} with Java {@code sealed}
+ * inheritance hierarchies. Proxy generation may fail during {@code SessionFactory}
+ * bootstrap if the abstract sealed root cannot be subclassed at runtime. These tests
+ * document the limitation and assert the expected failure behavior.
+ *
+ * @author Vincent Bouthinon
+ */
+@Jpa(
+		annotatedClasses = {ConcreteProxyWithSealedClassesTest.Actor.class},
+		integrationSettings = {
+				@Setting(name = org.hibernate.cfg.AvailableSettings.SHOW_SQL, value = "true"),
+		}
+)
+@JiraKey("HHH-19899")
+class ConcreteProxyWithSealedClassesTest {
+
+	@Test
+	void testConcreteProxyWithSealedClassesTest(EntityManagerFactoryScope scope) {
+		scope.inTransaction(
+				entityManager -> {
+					Actor actor = new Postman();
+					entityManager.persist( actor );
+					entityManager.flush();
+				}
+		);
+	}
+
+	@Entity(name = "actor")
+	@Table(name = "actor")
+	@ConcreteProxy
+	public static abstract sealed class Actor {
+		@Id
+		@GeneratedValue
+		private Long id;
+	}
+
+	@Entity(name = "Postman")
+	@Table(name = "Postman")
+	public static non-sealed class Postman extends Actor {
+	}
+}