Polish

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/source/ConfigurationPropertySource.java

@@ -30,6 +30,7 @@ import org.springframework.boot.origin.OriginTrackedValue;
  * @see OriginTrackedValue
  * @see #getConfigurationProperty(ConfigurationPropertyName)
  */
+@FunctionalInterface
 public interface ConfigurationPropertySource {
 
 	/**

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/tomcat/TomcatEmbeddedContext.java

@@ -61,9 +61,8 @@ class TomcatEmbeddedContext extends StandardContext {
 	}
 
 	public void deferredLoadOnStartup() throws LifecycleException {
-		doWithThreadContextClassLoader(getLoader().getClassLoader(), () -> {
-			getLoadOnStartupWrappers(findChildren()).forEach(this::load);
-		});
+		doWithThreadContextClassLoader(getLoader().getClassLoader(),
+				() -> getLoadOnStartupWrappers(findChildren()).forEach(this::load));
 	}
 
 	private Stream<Wrapper> getLoadOnStartupWrappers(Container[] children) {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/AbstractFilterRegistrationBean.java

@@ -29,9 +29,6 @@ import javax.servlet.FilterRegistration;
 import javax.servlet.FilterRegistration.Dynamic;
 import javax.servlet.ServletContext;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
@@ -55,8 +52,6 @@ public abstract class AbstractFilterRegistrationBean<T extends Filter>
 	@Deprecated
 	protected static final int REQUEST_WRAPPER_FILTER_MAX_ORDER = 0;
 
-	private final Log logger = LogFactory.getLog(getClass());
-
 	private static final String[] DEFAULT_URL_MAPPINGS = { "/*" };
 
 	private Set<ServletRegistrationBean<?>> servletRegistrationBeans = new LinkedHashSet<>();

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/ServletRegistrationBean.java

@@ -26,9 +26,6 @@ import javax.servlet.Servlet;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletRegistration;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
@@ -54,8 +51,6 @@ import org.springframework.util.StringUtils;
 public class ServletRegistrationBean<T extends Servlet>
 		extends DynamicRegistrationBean<ServletRegistration.Dynamic> {
 
-	private static final Log logger = LogFactory.getLog(ServletRegistrationBean.class);
-
 	private static final String[] DEFAULT_MAPPINGS = { "/*" };
 
 	private T servlet;

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/webservices/client/WebServiceTemplateCustomizer.java

@@ -24,6 +24,7 @@ import org.springframework.ws.client.core.WebServiceTemplate;
  * @author Dmytro Nosan
  * @since 2.1.0
  */
+@FunctionalInterface
 public interface WebServiceTemplateCustomizer {
 
 	/**

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/ServletComponentScanRegistrarTests.java

@@ -85,11 +85,9 @@ public class ServletComponentScanRegistrarTests {
 	@Test
 	public void packagesConfiguredWithBothValueAndBasePackages() {
 		assertThatExceptionOfType(AnnotationConfigurationException.class)
-				.isThrownBy(() -> {
-					this.context = new AnnotationConfigApplicationContext(
-							ValueAndBasePackages.class);
-				}).withMessageContaining("'value'")
-				.withMessageContaining("'basePackages'")
+				.isThrownBy(() -> this.context = new AnnotationConfigApplicationContext(
+						ValueAndBasePackages.class))
+				.withMessageContaining("'value'").withMessageContaining("'basePackages'")
 				.withMessageContaining("com.example.foo")
 				.withMessageContaining("com.example.bar");
 	}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/server/AbstractServletWebServerFactoryTests.java

@@ -1049,9 +1049,8 @@ public abstract class AbstractServletWebServerFactoryTests {
 	@Test
 	public void exceptionThrownOnLoadFailureIsRethrown() {
 		AbstractServletWebServerFactory factory = getFactory();
-		this.webServer = factory.getWebServer((context) -> {
-			context.addServlet("failing", FailingServlet.class).setLoadOnStartup(0);
-		});
+		this.webServer = factory.getWebServer((context) -> context
+				.addServlet("failing", FailingServlet.class).setLoadOnStartup(0));
 		assertThatExceptionOfType(WebServerException.class)
 				.isThrownBy(this.webServer::start)
 				.satisfies(this::wrapsFailingServletException);