Remove references to s.j.generate-ddl in favor of s.j.hibernate.ddl-auto

Closes gh-40503

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

@@ -46,6 +46,7 @@ import org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform;
 import org.hibernate.engine.transaction.jta.platform.spi.JtaPlatform;
 import org.hibernate.internal.SessionFactoryImpl;
 import org.hibernate.jpa.HibernatePersistenceProvider;
+import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.aot.hint.MemberCategory;
@@ -75,6 +76,7 @@ import org.springframework.context.ApplicationListener;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.orm.jpa.JpaTransactionManager;
 import org.springframework.orm.jpa.JpaVendorAdapter;
 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
@@ -508,6 +510,84 @@ class HibernateJpaAutoConfigurationTests extends AbstractJpaAutoConfigurationTes
 		}
 	}
 
+	@Test
+	@Disabled("gh-40177")
+	void whenSpringJpaGenerateDdlIsNotSetThenTableIsNotCreated() {
+		// spring.jpa.generated-ddl defaults to false but this test still fails because
+		// we're using an embedded database which means that HibernateProperties defaults
+		// hibernate.hbm2ddl.auto to create-drop, replacing the
+		// hibernate.hbm2ddl.auto=none that comes from generate-ddl being false.
+		contextRunner().run((context) -> assertThat(tablesFrom(context)).doesNotContain("CITY"));
+	}
+
+	@Test
+	void whenSpringJpaGenerateDdlIsTrueThenTableIsCreated() {
+		contextRunner().withPropertyValues("spring.jpa.generate-ddl=true")
+			.run((context) -> assertThat(tablesFrom(context)).contains("CITY"));
+	}
+
+	@Test
+	@Disabled("gh-40177")
+	void whenSpringJpaGenerateDdlIsFalseThenTableIsNotCreated() {
+		// This test fails because we're using an embedded database which means that
+		// HibernateProperties defaults hibernate.hbm2ddl.auto to create-drop, replacing
+		// the hibernate.hbm2ddl.auto=none that comes from setting generate-ddl to false.
+		contextRunner().withPropertyValues("spring.jpa.generate-ddl=false")
+			.run((context) -> assertThat(tablesFrom(context)).doesNotContain("CITY"));
+	}
+
+	@Test
+	void whenHbm2DdlAutoIsNoneThenTableIsNotCreated() {
+		contextRunner().withPropertyValues("spring.jpa.properties.hibernate.hbm2ddl.auto=none")
+			.run((context) -> assertThat(tablesFrom(context)).doesNotContain("CITY"));
+	}
+
+	@Test
+	void whenSpringJpaHibernateDdlAutoIsNoneThenTableIsNotCreated() {
+		contextRunner().withPropertyValues("spring.jpa.hibernate.ddl-auto=none")
+			.run((context) -> assertThat(tablesFrom(context)).doesNotContain("CITY"));
+	}
+
+	@Test
+	@Disabled("gh-40177")
+	void whenSpringJpaGenerateDdlIsTrueAndSpringJpaHibernateDdlAutoIsNoneThenTableIsNotCreated() {
+		// This test fails because when ddl-auto is set to none, we remove
+		// hibernate.hbm2ddl.auto from Hibernate properties. This then allows
+		// spring.jpa.generate-ddl to set it to create-drop
+		contextRunner().withPropertyValues("spring.jpa.generate-ddl=true", "spring.jpa.hibernate.ddl-auto=none")
+			.run((context) -> assertThat(tablesFrom(context)).doesNotContain("CITY"));
+	}
+
+	@Test
+	void whenSpringJpaGenerateDdlIsTrueAndSpringJpaHibernateDdlAutoIsDropThenTableIsNotCreated() {
+		contextRunner().withPropertyValues("spring.jpa.generate-ddl=true", "spring.jpa.hibernate.ddl-auto=drop")
+			.run((context) -> assertThat(tablesFrom(context)).doesNotContain("CITY"));
+	}
+
+	@Test
+	void whenSpringJpaGenerateDdlIsTrueAndJakartaSchemaGenerationIsNoneThenTableIsNotCreated() {
+		contextRunner()
+			.withPropertyValues("spring.jpa.generate-ddl=true",
+					"spring.jpa.properties.jakarta.persistence.schema-generation.database.action=none")
+			.run((context) -> assertThat(tablesFrom(context)).doesNotContain("CITY"));
+	}
+
+	@Test
+	void whenSpringJpaGenerateDdlIsTrueSpringJpaHibernateDdlAutoIsCreateAndJakartaSchemaGenerationIsNoneThenTableIsNotCreated() {
+		contextRunner()
+			.withPropertyValues("spring.jpa.generate-ddl=true", "spring.jpa.hibernate.ddl-auto=create",
+					"spring.jpa.properties.jakarta.persistence.schema-generation.database.action=none")
+			.run((context) -> assertThat(tablesFrom(context)).doesNotContain("CITY"));
+	}
+
+	private List<String> tablesFrom(AssertableApplicationContext context) {
+		DataSource dataSource = context.getBean(DataSource.class);
+		JdbcTemplate jdbc = new JdbcTemplate(dataSource);
+		List<String> tables = jdbc.query("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES",
+				(results, row) -> results.getString(1));
+		return tables;
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	@TestAutoConfigurationPackage(City.class)
 	@DependsOnDatabaseInitialization

spring-boot-project/spring-boot-docs/src/docs/asciidoc/anchor-rewrite.properties

@@ -1041,3 +1041,6 @@ features.testing.testcontainers.at-development-time=features.testcontainers.at-d
 features.testing.testcontainers.at-development-time.dynamic-properties=features.testcontainers.at-development-time.dynamic-properties
 features.testing.testcontainers.at-development-time.importing-container-declarations=features.testcontainers.at-development-time.importing-container-declarations
 features.testing.testcontainers.at-development-time.devtools=features.testcontainers.at-development-time.devtools
+
+# gh-40503
+howto.data-initialization.using-jpa=howto.data-initialization.using-hibernate

spring-boot-project/spring-boot-docs/src/docs/asciidoc/data/sql.adoc

@@ -282,7 +282,6 @@ The following line shows an example of setting JPA properties for Hibernate:
 The line in the preceding example passes a value of `true` for the `hibernate.globally_quoted_identifiers` property to the Hibernate entity manager.
 
 By default, the DDL execution (or validation) is deferred until the `ApplicationContext` has started.
-There is also a `spring.jpa.generate-ddl` flag, but it is not used if Hibernate auto-configuration is active, because the `ddl-auto` settings are more fine-grained.
 
 
 

spring-boot-project/spring-boot-docs/src/docs/asciidoc/howto/data-initialization.adoc

@@ -6,24 +6,17 @@ It is recommended to use a single mechanism for schema generation.
 
 
 
-[[howto.data-initialization.using-jpa]]
-=== Initialize a Database Using JPA
-JPA has features for DDL generation, and these can be set up to run on startup against the database.
-This is controlled through two external properties:
-
-* `spring.jpa.generate-ddl` (boolean) switches the feature on and off and is vendor independent.
-* `spring.jpa.hibernate.ddl-auto` (enum) is a Hibernate feature that controls the behavior in a more fine-grained way.
-  This feature is described in more detail later in this guide.
-
-
 
 [[howto.data-initialization.using-hibernate]]
 === Initialize a Database Using Hibernate
-You can set `spring.jpa.hibernate.ddl-auto` explicitly and the standard Hibernate property values are `none`, `validate`, `update`, `create`, and `create-drop`.
-Spring Boot chooses a default value for you based on whether it thinks your database is embedded.
-It defaults to `create-drop` if no schema manager has been detected or `none` in all other cases.
-An embedded database is detected by looking at the `Connection` type and JDBC url.
-`hsqldb`, `h2`, and `derby` are candidates, and others are not.
+You can set configprop:spring.jpa.hibernate.ddl-auto[] to control Hibernate's database initialization.
+Supported values are `none`, `validate`, `update`, `create`, and `create-drop`.
+Spring Boot chooses a default value for you based on whether you are using an embedded database.
+An embedded database is identified by looking at the `Connection` type and JDBC url.
+`hsqldb`, `h2`, or `derby` are embedded databases and others are not.
+If an embedded database is identified and no schema manager (Flyway or Liquibase) has been detected, `ddl-auto` defaults to `create-drop`.
+In all other cases, it defaults to `none`.
+
 Be careful when switching from in-memory to a '`real`' database that you do not make assumptions about the existence of the tables and data in the new platform.
 You either have to set `ddl-auto` explicitly or use one of the other mechanisms to initialize the database.