Merge pull request #15565 from ayudovin

* pr/15565:
  Polish "Disable Hibernate entity scanning for default JPA setup"
  Disable Hibernate entity scanning for default JPA setup

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

@@ -27,6 +27,7 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy;
 import org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 
@@ -40,6 +41,8 @@ import org.springframework.util.StringUtils;
 @ConfigurationProperties("spring.jpa.hibernate")
 public class HibernateProperties {
 
+	private static final String DISABLED_SCANNER_CLASS = "org.hibernate.boot.archive.scan.internal.DisabledScanner";
+
 	private final Naming naming = new Naming();
 
 	/**
@@ -95,6 +98,7 @@ public class HibernateProperties {
 			HibernateSettings settings) {
 		Map<String, Object> result = new HashMap<>(existing);
 		applyNewIdGeneratorMappings(result);
+		applyScanner(result);
 		getNaming().applyNamingStrategies(result);
 		String ddlAuto = determineDdlAuto(existing, settings::getDdlAuto);
 		if (StringUtils.hasText(ddlAuto) && !"none".equals(ddlAuto)) {
@@ -121,6 +125,13 @@ public class HibernateProperties {
 		}
 	}
 
+	private void applyScanner(Map<String, Object> result) {
+		if (!result.containsKey(AvailableSettings.SCANNER)
+				&& ClassUtils.isPresent(DISABLED_SCANNER_CLASS, null)) {
+			result.put(AvailableSettings.SCANNER, DISABLED_SCANNER_CLASS);
+		}
+	}
+
 	private String determineDdlAuto(Map<String, String> existing,
 			Supplier<String> defaultDdlAuto) {
 		String ddlAuto = existing.get(AvailableSettings.HBM2DDL_AUTO);

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

@@ -43,6 +43,7 @@ import static org.mockito.Mockito.verify;
  * Tests for {@link HibernateProperties}.
  *
  * @author Stephane Nicoll
+ * @author Artsiom Yudovin
  */
 public class HibernatePropertiesTests {
 
@@ -123,6 +124,23 @@ public class HibernatePropertiesTests {
 										"false")));
 	}
 
+	@Test
+	public void scannerUsesDisabledScannerByDefault() {
+		this.contextRunner.run(assertHibernateProperties(
+				(hibernateProperties) -> assertThat(hibernateProperties).containsEntry(
+						AvailableSettings.SCANNER,
+						"org.hibernate.boot.archive.scan.internal.DisabledScanner")));
+	}
+
+	@Test
+	public void scannerCanBeCustomized() {
+		this.contextRunner.withPropertyValues(
+				"spring.jpa.properties.hibernate.archive.scanner:org.hibernate.boot.archive.scan.internal.StandardScanner")
+				.run(assertHibernateProperties((hibernateProperties) -> assertThat(
+						hibernateProperties).containsEntry(AvailableSettings.SCANNER,
+								"org.hibernate.boot.archive.scan.internal.StandardScanner")));
+	}
+
 	@Test
 	public void defaultDdlAutoIsNotInvokedIfPropertyIsSet() {
 		this.contextRunner.withPropertyValues("spring.jpa.hibernate.ddl-auto=validate")