Polish

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/jmx/JmxEndpointAutoConfigurationTests.java

@@ -37,6 +37,8 @@ import org.springframework.boot.actuate.endpoint.jmx.annotation.JmxEndpointDisco
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.boot.test.context.runner.ContextConsumer;
+import org.springframework.context.ConfigurableApplicationContext;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
@@ -52,6 +54,9 @@ import static org.mockito.Mockito.times;
  */
 class JmxEndpointAutoConfigurationTests {
 
+	private static final ContextConsumer<ConfigurableApplicationContext> NO_OPERATION = (context) -> {
+	};
+
 	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
 			.withConfiguration(AutoConfigurations.of(EndpointAutoConfiguration.class, JmxAutoConfiguration.class,
 					JmxEndpointAutoConfiguration.class))
@@ -90,11 +95,11 @@ class JmxEndpointAutoConfigurationTests {
 		given(this.mBeanServer.queryNames(any(), any()))
 				.willReturn(new HashSet<>(Arrays.asList(new ObjectName("test:test=test"))));
 		ArgumentCaptor<ObjectName> objectName = ArgumentCaptor.forClass(ObjectName.class);
-		this.contextRunner.withPropertyValues("spring.jmx.enabled=true").with(mockMBeanServer()).run((parent) -> {
+		ApplicationContextRunner jmxEnabledContextRunner = this.contextRunner
-			this.contextRunner.withPropertyValues("spring.jmx.enabled=true").withParent(parent).run((child) -> {
+				.withPropertyValues("spring.jmx.enabled=true");
-			});
+		jmxEnabledContextRunner.with(mockMBeanServer()).run((parent) -> {
-			this.contextRunner.withPropertyValues("spring.jmx.enabled=true").withParent(parent).run((child) -> {
+			jmxEnabledContextRunner.withParent(parent).run(NO_OPERATION);
-			});
+			jmxEnabledContextRunner.withParent(parent).run(NO_OPERATION);
 		});
 		then(this.mBeanServer).should(times(3)).registerMBean(any(Object.class), objectName.capture());
 		Set<ObjectName> uniqueValues = new HashSet<>(objectName.getAllValues());

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/build/ImageBuildpack.java

@@ -61,12 +61,8 @@ final class ImageBuildpack implements Buildpack {
 			Image image = context.fetchImage(reference, ImageType.BUILDPACK);
 			BuildpackMetadata buildpackMetadata = BuildpackMetadata.fromImage(image);
 			this.coordinates = BuildpackCoordinates.fromBuildpackMetadata(buildpackMetadata);
-			if (!buildpackExistsInBuilder(context, image.getLayers())) {
+			this.exportedLayers = (!buildpackExistsInBuilder(context, image.getLayers()))
-				this.exportedLayers = new ExportedLayers(context, reference);
+					? new ExportedLayers(context, reference) : null;
-			}
-			else {
-				this.exportedLayers = null;
-			}
 		}
 		catch (IOException | DockerEngineException ex) {
 			throw new IllegalArgumentException("Error pulling buildpack image '" + reference + "'", ex);
@@ -76,11 +72,8 @@ final class ImageBuildpack implements Buildpack {
 	private boolean buildpackExistsInBuilder(BuildpackResolverContext context, List<LayerId> imageLayers) {
 		BuildpackLayerDetails buildpackLayerDetails = context.getBuildpackLayersMetadata()
 				.getBuildpack(this.coordinates.getId(), this.coordinates.getVersion());
-		if (buildpackLayerDetails != null) {
+		String layerDiffId = (buildpackLayerDetails != null) ? buildpackLayerDetails.getLayerDiffId() : null;
-			String layerDiffId = buildpackLayerDetails.getLayerDiffId();
+		return (layerDiffId != null) && imageLayers.stream().map(LayerId::toString).anyMatch(layerDiffId::equals);
-			return imageLayers.stream().map(LayerId::toString).anyMatch((layerId) -> layerId.equals(layerDiffId));
-		}
-		return false;
 	}
 
 	@Override