Allow hibernate naming strategy to be specified

Issue: #53028397

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.java

@@ -63,6 +63,9 @@ public class HibernateJpaAutoConfiguration extends JpaBaseConfiguration {
 	@Value("${spring.jpa.ddlAuto:${spring.jpa.ddl_auto:none}}")
 	private String ddlAuto; // e.g. none, validate, update, create, create-drop
 
+	@Value("${spring.jpa.hibernate.namingstrategy:org.hibernate.cfg.ImprovedNamingStrategy}")
+	private String namingStrategy;
+
 	@Bean
 	@Override
 	public JpaVendorAdapter jpaVendorAdapter() {
@@ -81,8 +84,13 @@ public class HibernateJpaAutoConfiguration extends JpaBaseConfiguration {
 		Map<String, Object> properties = entityManagerFactoryBean.getJpaPropertyMap();
 		properties.put("hibernate.cache.provider_class",
 				"org.hibernate.cache.HashtableCacheProvider");
-		properties.put("hibernate.ejb.naming_strategy",
-				ImprovedNamingStrategy.class.getName());
+		if (StringUtils.hasLength(this.namingStrategy)) {
+			properties.put("hibernate.ejb.naming_strategy", this.namingStrategy);
+		}
+		else {
+			properties.put("hibernate.ejb.naming_strategy",
+					ImprovedNamingStrategy.class.getName());
+		}
 		if (StringUtils.hasLength(this.ddlAuto) && !"none".equals(this.ddlAuto)) {
 			properties.put("hibernate.hbm2ddl.auto", this.ddlAuto);
 		}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfigurationTests.java

@@ -25,7 +25,6 @@ import org.springframework.boot.autoconfigure.ComponentScanDetectorConfiguration
 import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
 import org.springframework.boot.autoconfigure.jdbc.EmbeddedDatabaseConfiguration;
-import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
 import org.springframework.boot.autoconfigure.orm.jpa.test.City;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
@@ -33,12 +32,15 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
 import org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter;
 import org.springframework.orm.jpa.support.OpenEntityManagerInViewInterceptor;
 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
 
+import static org.hamcrest.Matchers.equalTo;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 
 /**
@@ -118,6 +120,25 @@ public class HibernateJpaAutoConfigurationTests {
 		assertEquals(0, getInterceptorBeans().length);
 	}
 
+	@Test
+	public void testCustomNamingStrategy() throws Exception {
+		AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
+		TestUtils
+				.addEnviroment(context,
+						"spring.jpa.hibernate.namingstrategy:org.hibernate.cfg.EJB3NamingStrategy");
+		context.register(TestConfiguration.class,
+				ComponentScanDetectorConfiguration.class,
+				EmbeddedDatabaseConfiguration.class, HibernateJpaAutoConfiguration.class,
+				PropertyPlaceholderAutoConfiguration.class);
+		this.context = context;
+		this.context.refresh();
+		LocalContainerEntityManagerFactoryBean bean = this.context
+				.getBean(LocalContainerEntityManagerFactoryBean.class);
+		String actual = (String) bean.getJpaPropertyMap().get(
+				"hibernate.ejb.naming_strategy");
+		assertThat(actual, equalTo("org.hibernate.cfg.EJB3NamingStrategy"));
+	}
+
 	private String[] getInterceptorBeans() {
 		return this.context.getBeanNamesForType(OpenEntityManagerInViewInterceptor.class);
 	}