Disable query startup checking during AOT and tweak hibernate logs.

Next to explicitly disabling query checks during AOT we now use an internal Dialect serving for required JdbcSettings.DIALECT. The name of the dialect is printed on info level via the JdbcEnvironment. Providing a meaningful name helps users understand better what is going on.

See: #4068

Author: christophstrobl

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/aot/AotMetamodel.java

@@ -31,13 +31,13 @@
 
 import org.hibernate.cfg.JdbcSettings;
 import org.hibernate.cfg.PersistenceSettings;
-import org.hibernate.dialect.H2Dialect;
+import org.hibernate.cfg.QuerySettings;
+import org.hibernate.dialect.Dialect;
 import org.hibernate.engine.jdbc.connections.internal.UserSuppliedConnectionProviderImpl;
 import org.hibernate.jpa.HibernatePersistenceProvider;
 import org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl;
 import org.hibernate.jpa.boot.internal.PersistenceUnitInfoDescriptor;
 import org.jspecify.annotations.Nullable;
-
 import org.springframework.data.util.Lazy;
 import org.springframework.orm.jpa.persistenceunit.PersistenceManagedTypes;
 import org.springframework.orm.jpa.persistenceunit.SpringPersistenceUnitInfo;
@@ -82,11 +82,12 @@ public AotMetamodel(PersistenceUnitInfo unitInfo) {
 	static Lazy<EntityManagerFactory> init(Supplier<PersistenceUnitInfoDescriptor> unitInfo) {
 
 		return Lazy.of(() -> new EntityManagerFactoryBuilderImpl(unitInfo.get(),
-				Map.of(JdbcSettings.DIALECT, H2Dialect.class.getName(), //
+				Map.of(JdbcSettings.DIALECT, SpringDataJpaAotDialect.INSTANCE, //
 						JdbcSettings.ALLOW_METADATA_ON_BOOT, false, //
 						JdbcSettings.CONNECTION_PROVIDER, new UserSuppliedConnectionProviderImpl(), //
+						QuerySettings.QUERY_STARTUP_CHECKING, false, //
 						PersistenceSettings.JPA_CALLBACKS_ENABLED, false))
-								.build());
+				.build());
 	}
 
 	private Metamodel getMetamodel() {
@@ -130,4 +131,13 @@ public EntityManagerFactory getEntityManagerFactory() {
 		return entityManagerFactory.get();
 	}
 
+	/**
+	 * A {@link Dialect} to satisfy the bootstrap requirements of {@link JdbcSettings#DIALECT} during the AOT Phase. Printed
+	 * to log files (info level) when the {@link org.hibernate.engine.jdbc.env.spi.JdbcEnvironment} is created.
+	 */
+	@SuppressWarnings("deprecation")
+	static class SpringDataJpaAotDialect extends Dialect {
+		static SpringDataJpaAotDialect INSTANCE = new SpringDataJpaAotDialect();
+	}
+
 }