hibernate-demo/src/test/java/com/ankurm/hibernatedemo/mappingstyle/XmlMappingMetadataCompleteTest.java

package com.ankurm.hibernatedemo.mappingstyle;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertThrows;

import com.ankurm.hibernatedemo.HibernateDemoApplication;
import org.hibernate.AnnotationException;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.BeanCreationException;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.context.ConfigurableApplicationContext;

/**
 * <xml-mapping-metadata-complete/> makes Hibernate IGNORE ALL annotations for this
 * persistence unit -- not just the ones a matching orm.xml entry overrides. OverrideEntity
 * carries @Id/@GeneratedValue on "id" in Java, but the metadata-complete orm.xml entry only
 * declares <basic name="value"> and omits <id> entirely. Result: bootstrap fails because
 * the (ignored) @Id annotation no longer counts -- proving metadata-complete is not just an
 * override switch, it is a full annotation kill-switch for the persistence unit.
 *
 * <p>Docs: docs/04-annotations-vs-xml.md, Topic 1.
 */
class XmlMappingMetadataCompleteTest {

    @Test
    void metadataComplete_ignoresAtIdAnnotation_bootFailsWithNoIdentifier() {
        SpringApplicationBuilder builder = new SpringApplicationBuilder(HibernateDemoApplication.class)
                .properties("spring.jpa.mapping-resources=orm-xml-metadata-complete.xml");

        BeanCreationException ex = assertThrows(BeanCreationException.class, () -> {
            try (ConfigurableApplicationContext ctx = builder.run()) {
                // never reached
            }
        });

        Throwable root = ex;
        while (root.getCause() != null) {
            root = root.getCause();
        }
        System.out.println("RESULT[metadata-complete]: boot FAILED as predicted: " + root.getClass().getName()
                + ": " + root.getMessage());
        assertThat(root).isInstanceOf(AnnotationException.class);
        assertThat(root.getMessage()).contains("has no identifier");
    }
}