Make @ImportAutoConfiguration not register package

Update `@ImportAutoConfiguration` so that it is no longer annotated with
`@AutoConfigurationPackage` and as such isn't a marker for
`AutoConfigurationPackages`.

Having `@ImportAutoConfiguration` marked as an auto-configuration
package is particularly problematic in tests since it frequently breaks
context caching.

Fixes gh-9282

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/ImportAutoConfiguration.java

@@ -46,7 +46,6 @@ import org.springframework.core.annotation.AliasFor;
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 @Inherited
-@AutoConfigurationPackage
 @Import(ImportAutoConfigurationImportSelector.class)
 public @interface ImportAutoConfiguration {
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/ImportAutoConfigurationImportSelectorTests.java

@@ -37,6 +37,7 @@ import org.springframework.core.env.Environment;
 import org.springframework.core.io.DefaultResourceLoader;
 import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.core.type.classreading.SimpleMetadataReaderFactory;
+import org.springframework.util.ClassUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.verifyZeroInteractions;
@@ -125,7 +126,6 @@ public class ImportAutoConfigurationImportSelectorTests {
 	public void exclusionsAliasesAreApplied() throws Exception {
 		AnnotationMetadata annotationMetadata = getAnnotationMetadata(
 				ImportWithSelfAnnotatingAnnotationExclude.class);
-
 		String[] imports = this.importSelector.selectImports(annotationMetadata);
 		assertThat(imports).isEmpty();
 	}
@@ -182,6 +182,19 @@ public class ImportAutoConfigurationImportSelectorTests {
 		assertThat(set1).isNotEqualTo(set2);
 	}
 
+	@Test
+	public void determineImportsShouldNotSetPackageImport() throws Exception {
+		Class<?> packageImportClass = ClassUtils.resolveClassName(
+				"org.springframework.boot.autoconfigure.AutoConfigurationPackages.PackageImport",
+				null);
+		Set<Object> selectedImports = this.importSelector
+				.determineImports(getAnnotationMetadata(
+						ImportMetaAutoConfigurationExcludeWithUnrelatedOne.class));
+		for (Object selectedImport : selectedImports) {
+			assertThat(selectedImport).isNotInstanceOf(packageImportClass);
+		}
+	}
+
 	private AnnotationMetadata getAnnotationMetadata(Class<?> source) throws IOException {
 		return new SimpleMetadataReaderFactory().getMetadataReader(source.getName())
 				.getAnnotationMetadata();

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/cache/ImportsContextCustomizerFactoryWithAutoConfigurationTests.java

@@ -24,6 +24,7 @@ import org.junit.runner.notification.RunNotifier;
 import org.junit.runners.model.InitializationError;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.AutoConfigurationPackage;
 import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
 import org.springframework.boot.autoconfigure.domain.EntityScan;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
@@ -94,8 +95,8 @@ public class ImportsContextCustomizerFactoryWithAutoConfigurationTests {
 
 	}
 
-	@ContextConfiguration(classes = EmptyConfig.class)
 	@DataJpaTest
+	@ContextConfiguration(classes = EmptyConfig.class)
 	@Unrelated2
 	public static class DataJpaTest2 {
 
@@ -109,8 +110,8 @@ public class ImportsContextCustomizerFactoryWithAutoConfigurationTests {
 
 	}
 
-	@ContextConfiguration(classes = EmptyConfig.class)
 	@DataJpaTest
+	@ContextConfiguration(classes = EmptyConfig.class)
 	@Unrelated1
 	public static class DataJpaTest3 {
 
@@ -124,8 +125,8 @@ public class ImportsContextCustomizerFactoryWithAutoConfigurationTests {
 
 	}
 
-	@ContextConfiguration(classes = EmptyConfig.class)
 	@DataJpaTest(showSql = false)
+	@ContextConfiguration(classes = EmptyConfig.class)
 	@Unrelated1
 	public static class DataJpaTest4 {
 
@@ -151,6 +152,7 @@ public class ImportsContextCustomizerFactoryWithAutoConfigurationTests {
 
 	@Configuration
 	@EntityScan(basePackageClasses = ExampleEntity.class)
+	@AutoConfigurationPackage
 	static class EmptyConfig {
 
 	}