Replace anonymous inner class with lambda

See gh-15438

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/documentation/PrometheusScrapeEndpointDocumentationTests.java

@@ -18,7 +18,6 @@ package org.springframework.boot.actuate.autoconfigure.endpoint.web.documentatio
 
 import io.micrometer.core.instrument.Clock;
 import io.micrometer.core.instrument.binder.jvm.JvmMemoryMetrics;
-import io.micrometer.prometheus.PrometheusConfig;
 import io.micrometer.prometheus.PrometheusMeterRegistry;
 import io.prometheus.client.CollectorRegistry;
 import org.junit.Test;
@@ -54,14 +53,7 @@ public class PrometheusScrapeEndpointDocumentationTests
 		public PrometheusScrapeEndpoint endpoint() {
 			CollectorRegistry collectorRegistry = new CollectorRegistry(true);
 			PrometheusMeterRegistry meterRegistry = new PrometheusMeterRegistry(
-					new PrometheusConfig() {
-
-						@Override
-						public String get(String key) {
-							return null;
-						}
-
-					}, collectorRegistry, Clock.SYSTEM);
+					(key) -> null, collectorRegistry, Clock.SYSTEM);
 			new JvmMemoryMetrics().bindTo(meterRegistry);
 			return new PrometheusScrapeEndpoint(collectorRegistry);
 		}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/MissingRequiredConfigurationFailureAnalyzerTests.java

@@ -17,7 +17,6 @@
 package org.springframework.boot.actuate.autoconfigure.metrics;
 
 import io.micrometer.core.instrument.Clock;
-import io.micrometer.newrelic.NewRelicConfig;
 import io.micrometer.newrelic.NewRelicMeterRegistry;
 import org.junit.Test;
 
@@ -64,14 +63,7 @@ public class MissingRequiredConfigurationFailureAnalyzerTests {
 
 		@Bean
 		public NewRelicMeterRegistry meterRegistry() {
-			return new NewRelicMeterRegistry(new NewRelicConfig() {
-
-				@Override
-				public String get(String key) {
-					return null;
-				}
-
-			}, Clock.SYSTEM);
+			return new NewRelicMeterRegistry((key) -> null, Clock.SYSTEM);
 		}
 
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/atlas/AtlasMetricsExportAutoConfigurationTests.java

@@ -107,14 +107,7 @@ public class AtlasMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public AtlasConfig customConfig() {
-			return new AtlasConfig() {
-
-				@Override
-				public String get(String k) {
-					return null;
-				}
-
-			};
+			return (k) -> null;
 		}
 
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/datadog/DatadogMetricsExportAutoConfigurationTests.java

@@ -116,16 +116,11 @@ public class DatadogMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public DatadogConfig customConfig() {
-			return new DatadogConfig() {
-
-				@Override
-				public String get(String k) {
-					if ("datadog.apiKey".equals(k)) {
-						return "12345";
-					}
-					return null;
+			return (k) -> {
+				if ("datadog.apiKey".equals(k)) {
+					return "12345";
 				}
-
+				return null;
 			};
 		}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/ganglia/GangliaMetricsExportAutoConfigurationTests.java

@@ -107,14 +107,7 @@ public class GangliaMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public GangliaConfig customConfig() {
-			return new GangliaConfig() {
-
-				@Override
-				public String get(String k) {
-					return null;
-				}
-
-			};
+			return (k) -> null;
 		}
 
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/graphite/GraphiteMetricsExportAutoConfigurationTests.java

@@ -124,16 +124,11 @@ public class GraphiteMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public GraphiteConfig customConfig() {
-			return new GraphiteConfig() {
-
-				@Override
-				public String get(String k) {
-					if ("Graphite.apiKey".equals(k)) {
-						return "12345";
-					}
-					return null;
+			return (k) -> {
+				if ("Graphite.apiKey".equals(k)) {
+					return "12345";
 				}
-
+				return null;
 			};
 		}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/humio/HumioMetricsExportAutoConfigurationTests.java

@@ -109,14 +109,7 @@ public class HumioMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public HumioConfig customConfig() {
-			return new HumioConfig() {
-
-				@Override
-				public String get(String k) {
-					return null;
-				}
-
-			};
+			return (k) -> null;
 		}
 
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/influx/InfluxMetricsExportAutoConfigurationTests.java

@@ -107,14 +107,7 @@ public class InfluxMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public InfluxConfig customConfig() {
-			return new InfluxConfig() {
-
-				@Override
-				public String get(String k) {
-					return null;
-				}
-
-			};
+			return (k) -> null;
 		}
 
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/newrelic/NewRelicMetricsExportAutoConfigurationTests.java

@@ -129,19 +129,14 @@ public class NewRelicMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public NewRelicConfig customConfig() {
-			return new NewRelicConfig() {
-
-				@Override
-				public String get(String k) {
-					if ("newrelic.accountId".equals(k)) {
-						return "abcde";
-					}
-					if ("newrelic.apiKey".equals(k)) {
-						return "12345";
-					}
-					return null;
+			return (k) -> {
+				if ("newrelic.accountId".equals(k)) {
+					return "abcde";
 				}
-
+				if ("newrelic.apiKey".equals(k)) {
+					return "12345";
+				}
+				return null;
 			};
 		}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/prometheus/PrometheusMetricsExportAutoConfigurationTests.java

@@ -157,14 +157,7 @@ public class PrometheusMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public PrometheusConfig customConfig() {
-			return new PrometheusConfig() {
-
-				@Override
-				public String get(String k) {
-					return null;
-				}
-
-			};
+			return (k) -> null;
 		}
 
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/signalfx/SignalFxMetricsExportAutoConfigurationTests.java

@@ -124,16 +124,11 @@ public class SignalFxMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public SignalFxConfig customConfig() {
-			return new SignalFxConfig() {
-
-				@Override
-				public String get(String k) {
-					if ("signalfx.accessToken".equals(k)) {
-						return "abcde";
-					}
-					return null;
+			return (k) -> {
+				if ("signalfx.accessToken".equals(k)) {
+					return "abcde";
 				}
-
+				return null;
 			};
 		}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/simple/SimpleMetricsExportAutoConfigurationTests.java

@@ -90,14 +90,7 @@ public class SimpleMetricsExportAutoConfigurationTests {
 
 		@Bean
 		public SimpleConfig customConfig() {
-			return new SimpleConfig() {
-
-				@Override
-				public String get(String k) {
-					return null;
-				}
-
-			};
+			return (k) -> null;
 		}
 
 	}

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/reactive/WebFluxEndpointIntegrationTests.java

@@ -19,7 +19,6 @@ package org.springframework.boot.actuate.endpoint.web.reactive;
 import java.util.Arrays;
 
 import org.junit.Test;
-import reactor.core.publisher.Mono;
 
 import org.springframework.boot.actuate.endpoint.web.EndpointLinksResolver;
 import org.springframework.boot.actuate.endpoint.web.EndpointMapping;
@@ -44,9 +43,7 @@ import org.springframework.security.core.authority.SimpleGrantedAuthority;
 import org.springframework.security.core.context.ReactiveSecurityContextHolder;
 import org.springframework.web.cors.CorsConfiguration;
 import org.springframework.web.reactive.config.EnableWebFlux;
-import org.springframework.web.server.ServerWebExchange;
 import org.springframework.web.server.WebFilter;
-import org.springframework.web.server.WebFilterChain;
 import org.springframework.web.server.adapter.WebHttpHandlerBuilder;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -148,20 +145,11 @@ public class WebFluxEndpointIntegrationTests extends
 
 		@Bean
 		public WebFilter webFilter() {
-			return new WebFilter() {
-
-				@Override
-				public Mono<Void> filter(ServerWebExchange exchange,
-						WebFilterChain chain) {
-					return chain.filter(exchange).subscriberContext(
-							ReactiveSecurityContextHolder.withAuthentication(
-									new UsernamePasswordAuthenticationToken("Alice",
-											"secret",
-											Arrays.asList(new SimpleGrantedAuthority(
-													"ROLE_ACTUATOR")))));
-				}
-
-			};
+			return (exchange, chain) -> chain.filter(exchange)
+					.subscriberContext(ReactiveSecurityContextHolder.withAuthentication(
+							new UsernamePasswordAuthenticationToken("Alice", "secret",
+									Arrays.asList(new SimpleGrantedAuthority(
+											"ROLE_ACTUATOR")))));
 		}
 
 	}

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/trace/http/reactive/HttpTraceWebFilterTests.java

@@ -33,9 +33,7 @@ import org.springframework.boot.actuate.trace.http.Include;
 import org.springframework.boot.actuate.web.trace.reactive.HttpTraceWebFilter;
 import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
 import org.springframework.mock.web.server.MockServerWebExchange;
-import org.springframework.web.server.ServerWebExchange;
 import org.springframework.web.server.ServerWebExchangeDecorator;
-import org.springframework.web.server.WebFilterChain;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.fail;
@@ -62,14 +60,7 @@ public class HttpTraceWebFilterTests {
 		this.filter.filter(
 				MockServerWebExchange
 						.from(MockServerHttpRequest.get("https://api.example.com")),
-				new WebFilterChain() {
-
-					@Override
-					public Mono<Void> filter(ServerWebExchange exchange) {
-						return Mono.empty();
-					}
-
-				}).block(Duration.ofSeconds(30));
+				(exchange) -> Mono.empty()).block(Duration.ofSeconds(30));
 		assertThat(this.repository.findAll()).hasSize(1);
 	}
 
@@ -79,15 +70,10 @@ public class HttpTraceWebFilterTests {
 		this.filter.filter(
 				MockServerWebExchange
 						.from(MockServerHttpRequest.get("https://api.example.com")),
-				new WebFilterChain() {
-
-					@Override
-					public Mono<Void> filter(ServerWebExchange exchange) {
-						exchange.getSession().block(Duration.ofSeconds(30))
+				(exchange) -> {
+					exchange.getSession().block(Duration.ofSeconds(30))
 								.getAttributes().put("a", "alpha");
-						return Mono.empty();
-					}
-
+					return Mono.empty();
 				}).block(Duration.ofSeconds(30));
 		assertThat(this.repository.findAll()).hasSize(1);
 		Session session = this.repository.findAll().get(0).getSession();
@@ -101,14 +87,9 @@ public class HttpTraceWebFilterTests {
 		this.filter.filter(
 				MockServerWebExchange
 						.from(MockServerHttpRequest.get("https://api.example.com")),
-				new WebFilterChain() {
-
-					@Override
-					public Mono<Void> filter(ServerWebExchange exchange) {
-						exchange.getSession().block(Duration.ofSeconds(30));
-						return Mono.empty();
-					}
-
+				(exchange) -> {
+					exchange.getSession().block(Duration.ofSeconds(30));
+					return Mono.empty();
 				}).block(Duration.ofSeconds(30));
 		assertThat(this.repository.findAll()).hasSize(1);
 		Session session = this.repository.findAll().get(0).getSession();
@@ -127,15 +108,10 @@ public class HttpTraceWebFilterTests {
 				return Mono.just(principal);
 			}
 
-		}, new WebFilterChain() {
-
-			@Override
-			public Mono<Void> filter(ServerWebExchange exchange) {
-				exchange.getSession().block(Duration.ofSeconds(30)).getAttributes()
+		}, (exchange) -> {
+			exchange.getSession().block(Duration.ofSeconds(30)).getAttributes()
 						.put("a", "alpha");
-				return Mono.empty();
-			}
-
+			return Mono.empty();
 		}).block(Duration.ofSeconds(30));
 		assertThat(this.repository.findAll()).hasSize(1);
 		org.springframework.boot.actuate.trace.http.HttpTrace.Principal tracedPrincipal = this.repository
@@ -151,14 +127,7 @@ public class HttpTraceWebFilterTests {
 			this.filter.filter(
 					MockServerWebExchange
 							.from(MockServerHttpRequest.get("https://api.example.com")),
-					new WebFilterChain() {
-
-						@Override
-						public Mono<Void> filter(ServerWebExchange exchange) {
-							return Mono.error(new RuntimeException());
-						}
-
-					}).block(Duration.ofSeconds(30));
+					(exchange) -> Mono.error(new RuntimeException())).block(Duration.ofSeconds(30));
 			fail();
 		}
 		catch (Exception ex) {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/reactive/ReactiveUserDetailsServiceAutoConfigurationTests.java

@@ -19,7 +19,6 @@ package org.springframework.boot.autoconfigure.security.reactive;
 import java.time.Duration;
 
 import org.junit.Test;
-import reactor.core.publisher.Mono;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.security.SecurityProperties;
@@ -30,7 +29,6 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.security.authentication.ReactiveAuthenticationManager;
 import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
-import org.springframework.security.core.Authentication;
 import org.springframework.security.core.userdetails.MapReactiveUserDetailsService;
 import org.springframework.security.core.userdetails.ReactiveUserDetailsService;
 import org.springframework.security.core.userdetails.User;
@@ -156,12 +154,7 @@ public class ReactiveUserDetailsServiceAutoConfigurationTests {
 
 		@Bean
 		public ReactiveAuthenticationManager reactiveAuthenticationManager() {
-			return new ReactiveAuthenticationManager() {
-				@Override
-				public Mono<Authentication> authenticate(Authentication authentication) {
-					return null;
-				}
-			};
+			return (authentication) -> null;
 		}
 
 	}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java

@@ -26,7 +26,6 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicReference;
 
-import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
@@ -270,13 +269,9 @@ public class ServerPropertiesTests {
 	@Test
 	public void jettyMaxHttpPostSizeMatchesDefault() throws Exception {
 		JettyServletWebServerFactory jettyFactory = new JettyServletWebServerFactory(0);
-		JettyWebServer jetty = (JettyWebServer) jettyFactory
-				.getWebServer(new ServletContextInitializer() {
-
-					@Override
-					public void onStartup(ServletContext servletContext)
-							throws ServletException {
-						servletContext.addServlet("formPost", new HttpServlet() {
+		JettyWebServer jetty = (JettyWebServer) jettyFactory.getWebServer(
+				(ServletContextInitializer) (servletContext) -> servletContext
+						.addServlet("formPost", new HttpServlet() {
 
 							@Override
 							protected void doPost(HttpServletRequest req,
@@ -285,10 +280,7 @@ public class ServerPropertiesTests {
 								req.getParameterMap();
 							}
 
-						}).addMapping("/form");
-					}
-
-				});
+						}).addMapping("/form"));
 		jetty.start();
 		org.eclipse.jetty.server.Connector connector = jetty.getServer()
 				.getConnectors()[0];

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringApplicationTests.java

@@ -669,26 +669,18 @@ public class SpringApplicationTests {
 		CommandLineRunner commandLineRunner = mock(CommandLineRunner.class);
 		application.addInitializers((context) -> {
 			ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
-			beanFactory.registerSingleton("commandLineRunner", new CommandLineRunner() {
-
-				@Override
-				public void run(String... args) throws Exception {
-					assertThat(SpringApplicationTests.this.output.toString())
-							.contains("Started");
-					commandLineRunner.run(args);
-				}
-
-			});
-			beanFactory.registerSingleton("applicationRunner", new ApplicationRunner() {
-
-				@Override
-				public void run(ApplicationArguments args) throws Exception {
-					assertThat(SpringApplicationTests.this.output.toString())
-							.contains("Started");
-					applicationRunner.run(args);
-				}
-
-			});
+			beanFactory.registerSingleton("commandLineRunner",
+					(CommandLineRunner) (args) -> {
+						assertThat(SpringApplicationTests.this.output.toString())
+								.contains("Started");
+						commandLineRunner.run(args);
+					});
+			beanFactory.registerSingleton("applicationRunner",
+					(ApplicationRunner) (args) -> {
+						assertThat(SpringApplicationTests.this.output.toString())
+								.contains("Started");
+						applicationRunner.run(args);
+					});
 		});
 		application.setWebApplicationType(WebApplicationType.NONE);
 		ApplicationListener<ApplicationReadyEvent> eventListener = mock(

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/embedded/jetty/JettyServletWebServerFactoryTests.java

@@ -301,25 +301,20 @@ public class JettyServletWebServerFactoryTests
 	@Test
 	public void faultyListenerCausesStartFailure() throws Exception {
 		JettyServletWebServerFactory factory = getFactory();
-		factory.addServerCustomizers(new JettyServerCustomizer() {
+		factory.addServerCustomizers((JettyServerCustomizer) (server) -> {
+			Collection<WebAppContext> contexts = server.getBeans(WebAppContext.class);
+			contexts.iterator().next().addEventListener(new ServletContextListener() {
 
-			@Override
-			public void customize(Server server) {
-				Collection<WebAppContext> contexts = server.getBeans(WebAppContext.class);
-				contexts.iterator().next().addEventListener(new ServletContextListener() {
+				@Override
+				public void contextInitialized(ServletContextEvent sce) {
+					throw new RuntimeException();
+				}
 
-					@Override
-					public void contextInitialized(ServletContextEvent sce) {
-						throw new RuntimeException();
-					}
-
-					@Override
-					public void contextDestroyed(ServletContextEvent sce) {
-					}
-
-				});
-			}
+				@Override
+				public void contextDestroyed(ServletContextEvent sce) {
+				}
 
+			});
 		});
 		assertThatExceptionOfType(WebServerException.class).isThrownBy(() -> {
 			JettyWebServer jettyWebServer = (JettyWebServer) factory.getWebServer();

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

@@ -38,11 +38,9 @@ import org.mockito.Captor;
 import org.mockito.InOrder;
 import org.mockito.MockitoAnnotations;
 
-import org.springframework.beans.BeansException;
 import org.springframework.beans.MutablePropertyValues;
 import org.springframework.beans.factory.BeanCreationException;
 import org.springframework.beans.factory.config.BeanDefinition;
-import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.config.ConstructorArgumentValues;
 import org.springframework.beans.factory.config.Scope;
@@ -475,16 +473,10 @@ public class ServletWebServerApplicationContextTests {
 		beanDefinition.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_CONSTRUCTOR);
 		this.context.registerBeanDefinition("withAutowiredServletRequest",
 				beanDefinition);
-		this.context.addBeanFactoryPostProcessor(new BeanFactoryPostProcessor() {
-
-			@Override
-			public void postProcessBeanFactory(
-					ConfigurableListableBeanFactory beanFactory) throws BeansException {
-				WithAutowiredServletRequest bean = beanFactory
-						.getBean(WithAutowiredServletRequest.class);
-				assertThat(bean.getRequest()).isNotNull();
-			}
-
+		this.context.addBeanFactoryPostProcessor((beanFactory) -> {
+			WithAutowiredServletRequest bean = beanFactory
+					.getBean(WithAutowiredServletRequest.class);
+			assertThat(bean.getRequest()).isNotNull();
 		});
 		this.context.refresh();
 		String output = this.output.toString().substring(initialOutputLength);