Add Hibernate 7 batches 2-5: mapping styles, JPA annotations, natural IDs, @Immutable, stored procedures, in-memory test databases, JNDI mocking, proxies, associations, temporal mapping and named queries (Hibernate 7.4.5.Final + Spring Boot 4.1.1 + JDK 25)

2026-09-06 10:30:19 +05:30
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+package com.ankurm.hibernatedemo.mappingstyle;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.ankurm.hibernatedemo.HibernateDemoApplication;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.TestPropertySource;
+
+/**
+ * Proves that {@code spring.jpa.mapping-resources} is the Spring Boot 4.1.1 wiring that makes
+ * an orm.xml-only mapping (no {@code @Entity} at all) a real managed JPA entity, backed by a
+ * table ({@code xml_only_widgets}) that ONLY orm.xml knows about.
+ *
+ * <p>Docs: docs/04-annotations-vs-xml.md, Topic 1.
+ */
+@SpringBootTest(classes = HibernateDemoApplication.class)
+@TestPropertySource(properties = {
+        "spring.jpa.mapping-resources=orm-xml-only-mapping.xml"
+})
+class OrmXmlMappingResourcesTest {
+
+    @Autowired
+    private EntityManagerFactory emf;
+
+    @Test
+    void ormXmlOnlyEntity_isManaged_andRoundTripsThroughItsOwnTable() {
+        EntityManager em = emf.createEntityManager();
+        em.getTransaction().begin();
+        OrmXmlOnlyEntity e = new OrmXmlOnlyEntity("mapped-by-orm-xml-only");
+        em.persist(e);
+        em.getTransaction().commit();
+        Long id = e.getId();
+        em.close();
+
+        assertThat(id).isNotNull();
+
+        EntityManager em2 = emf.createEntityManager();
+        // This JPQL uses the entity name (defaults to simple class name) -- proves the entity is
+        // registered in metadata purely via orm.xml, with zero annotations on the Java class.
+        List<OrmXmlOnlyEntity> found = em2.createQuery(
+                "select o from OrmXmlOnlyEntity o where o.label = :label", OrmXmlOnlyEntity.class)
+                .setParameter("label", "mapped-by-orm-xml-only")
+                .getResultList();
+        em2.close();
+
+        assertThat(found).hasSize(1);
+        assertThat(found.get(0).getId()).isEqualTo(id);
+        System.out.println("RESULT[orm-xml-only]: persisted+queried id=" + id
+                + " via JPQL against entity mapped ENTIRELY by orm.xml (table xml_only_widgets), zero annotations on the Java class.");
+    }
+}