HHH-19079 Test case showing the problem

Author: cigaly

hibernate-core/src/test/java/org/hibernate/orm/test/embeddableinheritancereplace/Base.java

@@ -0,0 +1,33 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.embeddableinheritancereplace;
+
+import jakarta.persistence.DiscriminatorColumn;
+import jakarta.persistence.DiscriminatorType;
+import jakarta.persistence.DiscriminatorValue;
+import jakarta.persistence.Embeddable;
+
+@Embeddable
+@DiscriminatorColumn(name = "etype", discriminatorType = DiscriminatorType.CHAR)
+@DiscriminatorValue("b")
+public class Base {
+
+	protected int num;
+
+	protected Base() {
+	}
+
+	public Base(int num, String str) {
+		this.num = num;
+	}
+
+	public int getNum() {
+		return num;
+	}
+
+	public void setNum(int num) {
+		this.num = num;
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/embeddableinheritancereplace/Emb.java

@@ -0,0 +1,20 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.embeddableinheritancereplace;
+
+import jakarta.persistence.DiscriminatorValue;
+import jakarta.persistence.Embeddable;
+
+@Embeddable
+@DiscriminatorValue("E")
+public final class Emb extends Next {
+
+	Emb() {
+	}
+
+	public Emb(int num, String str) {
+		super(num, str);
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/embeddableinheritancereplace/EmbeddableInheritanceReplaceTest.java

@@ -0,0 +1,27 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.embeddableinheritancereplace;
+
+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;
+
+@DomainModel(annotatedClasses = {Emb.class, Base.class, Next.class, Ent.class})
+@SessionFactory
+@JiraKey( "HHH-19079" )
+public class EmbeddableInheritanceReplaceTest {
+
+	@Test
+	void merge(SessionFactoryScope scope) {
+		scope.inTransaction(session -> {
+			final var history = new Ent();
+			history.setBase(new Emb(42, "Hello, World!"));
+
+			session.merge(history);
+		});
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/embeddableinheritancereplace/Ent.java

@@ -0,0 +1,44 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.embeddableinheritancereplace;
+
+import jakarta.persistence.Embedded;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+
+@Entity
+public class Ent {
+
+	@Id
+	@GeneratedValue
+	private Integer id;
+
+	@Embedded
+	private Base base;
+
+	public Ent() {
+	}
+
+	public Ent(final Integer id) {
+		this.id = id;
+	}
+
+	public Integer getId() {
+		return id;
+	}
+
+	public void setId(Integer id) {
+		this.id = id;
+	}
+
+	public Base getBase() {
+		return base;
+	}
+
+	public void setBase(Base base) {
+		this.base = base;
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/embeddableinheritancereplace/Next.java

@@ -0,0 +1,23 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.embeddableinheritancereplace;
+
+import jakarta.persistence.DiscriminatorValue;
+import jakarta.persistence.Embeddable;
+
+@Embeddable
+@DiscriminatorValue("n")
+public class Next extends Base {
+
+	private String str;
+
+	public Next(int num, String str) {
+		super(num, str);
+		this.str=str;
+	}
+
+	public Next() {
+	}
+}