Use lambdas when possible

Replace anonymous inner classes with lambda declarations (when possible
using method references).

See gh-9781

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

@@ -249,15 +249,7 @@ public class AutoConfigurationImportSelectorTests {
 		@Override
 		protected List<AutoConfigurationImportListener> getAutoConfigurationImportListeners() {
 			return Collections.<AutoConfigurationImportListener>singletonList(
-					new AutoConfigurationImportListener() {
-
-						@Override
-						public void onAutoConfigurationImportEvent(
-								AutoConfigurationImportEvent event) {
-							TestAutoConfigurationImportSelector.this.lastEvent = event;
-						}
-
-					});
+					(event) -> this.lastEvent = event);
 		}
 
 		public AutoConfigurationImportEvent getLastEvent() {

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/batch/JobLauncherCommandLineRunnerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,7 +23,6 @@ import org.springframework.batch.core.Job;
 import org.springframework.batch.core.JobParameters;
 import org.springframework.batch.core.JobParametersBuilder;
 import org.springframework.batch.core.Step;
-import org.springframework.batch.core.StepContribution;
 import org.springframework.batch.core.configuration.annotation.BatchConfigurer;
 import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
 import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
@@ -35,9 +34,7 @@ import org.springframework.batch.core.launch.support.RunIdIncrementer;
 import org.springframework.batch.core.launch.support.SimpleJobLauncher;
 import org.springframework.batch.core.repository.JobRepository;
 import org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean;
-import org.springframework.batch.core.scope.context.ChunkContext;
 import org.springframework.batch.core.step.tasklet.Tasklet;
-import org.springframework.batch.repeat.RepeatStatus;
 import org.springframework.batch.support.transaction.ResourcelessTransactionManager;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Configuration;
@@ -80,13 +77,8 @@ public class JobLauncherCommandLineRunnerTests {
 		PlatformTransactionManager transactionManager = this.context
 				.getBean(PlatformTransactionManager.class);
 		this.steps = new StepBuilderFactory(jobRepository, transactionManager);
-		this.step = this.steps.get("step").tasklet(new Tasklet() {
-			@Override
-			public RepeatStatus execute(StepContribution contribution,
-					ChunkContext chunkContext) throws Exception {
-				return null;
-			}
-		}).build();
+		Tasklet tasklet = (contribution, chunkContext) -> null;
+		this.step = this.steps.get("step").tasklet(tasklet).build();
 		this.job = this.jobs.get("job").start(this.step).build();
 		this.jobExplorer = this.context.getBean(JobExplorer.class);
 		this.runner = new JobLauncherCommandLineRunner(this.jobLauncher,
@@ -115,13 +107,8 @@ public class JobLauncherCommandLineRunnerTests {
 	@Test
 	public void retryFailedExecution() throws Exception {
 		this.job = this.jobs.get("job")
-				.start(this.steps.get("step").tasklet(new Tasklet() {
-					@Override
-					public RepeatStatus execute(StepContribution contribution,
-							ChunkContext chunkContext) throws Exception {
-						throw new RuntimeException("Planned");
-					}
-				}).build()).incrementer(new RunIdIncrementer()).build();
+				.start(this.steps.get("step").tasklet(throwingTasklet()).build())
+				.incrementer(new RunIdIncrementer()).build();
 		this.runner.execute(this.job, new JobParameters());
 		this.runner.execute(this.job, new JobParameters());
 		assertThat(this.jobExplorer.getJobInstances("job", 0, 100)).hasSize(1);
@@ -130,13 +117,8 @@ public class JobLauncherCommandLineRunnerTests {
 	@Test
 	public void retryFailedExecutionOnNonRestartableJob() throws Exception {
 		this.job = this.jobs.get("job").preventRestart()
-				.start(this.steps.get("step").tasklet(new Tasklet() {
-					@Override
-					public RepeatStatus execute(StepContribution contribution,
-							ChunkContext chunkContext) throws Exception {
-						throw new RuntimeException("Planned");
-					}
-				}).build()).incrementer(new RunIdIncrementer()).build();
+				.start(this.steps.get("step").tasklet(throwingTasklet()).build())
+				.incrementer(new RunIdIncrementer()).build();
 		this.runner.execute(this.job, new JobParameters());
 		this.runner.execute(this.job, new JobParameters());
 		// A failed job that is not restartable does not re-use the job params of
@@ -147,13 +129,8 @@ public class JobLauncherCommandLineRunnerTests {
 	@Test
 	public void retryFailedExecutionWithNonIdentifyingParameters() throws Exception {
 		this.job = this.jobs.get("job")
-				.start(this.steps.get("step").tasklet(new Tasklet() {
-					@Override
-					public RepeatStatus execute(StepContribution contribution,
-							ChunkContext chunkContext) throws Exception {
-						throw new RuntimeException("Planned");
-					}
-				}).build()).incrementer(new RunIdIncrementer()).build();
+				.start(this.steps.get("step").tasklet(throwingTasklet()).build())
+				.incrementer(new RunIdIncrementer()).build();
 		JobParameters jobParameters = new JobParametersBuilder().addLong("id", 1L, false)
 				.addLong("foo", 2L, false).toJobParameters();
 		this.runner.execute(this.job, jobParameters);
@@ -161,6 +138,12 @@ public class JobLauncherCommandLineRunnerTests {
 		assertThat(this.jobExplorer.getJobInstances("job", 0, 100)).hasSize(1);
 	}
 
+	private Tasklet throwingTasklet() {
+		return (contribution, chunkContext) -> {
+			throw new RuntimeException("Planned");
+		};
+	}
+
 	@Configuration
 	@EnableBatchProcessing
 	protected static class BatchConfiguration implements BatchConfigurer {

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

@@ -19,7 +19,6 @@ package org.springframework.boot.autoconfigure.cache;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -69,7 +68,6 @@ import org.springframework.cache.caffeine.CaffeineCacheManager;
 import org.springframework.cache.concurrent.ConcurrentMapCache;
 import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
 import org.springframework.cache.ehcache.EhCacheCacheManager;
-import org.springframework.cache.interceptor.CacheOperationInvocationContext;
 import org.springframework.cache.interceptor.CacheResolver;
 import org.springframework.cache.jcache.JCacheCacheManager;
 import org.springframework.cache.support.NoOpCacheManager;
@@ -965,16 +963,13 @@ public class CacheAutoConfigurationTests {
 
 		@Bean
 		JCacheManagerCustomizer myCustomizer() {
-			return new JCacheManagerCustomizer() {
-				@Override
-				public void customize(javax.cache.CacheManager cacheManager) {
-					MutableConfiguration<?, ?> config = new MutableConfiguration<>();
-					config.setExpiryPolicyFactory(
-							CreatedExpiryPolicy.factoryOf(Duration.TEN_MINUTES));
-					config.setStatisticsEnabled(true);
-					cacheManager.createCache("custom1", config);
-					cacheManager.destroyCache("bar");
-				}
+			return (cacheManager) -> {
+				MutableConfiguration<?, ?> config = new MutableConfiguration<>();
+				config.setExpiryPolicyFactory(
+						CreatedExpiryPolicy.factoryOf(Duration.TEN_MINUTES));
+				config.setStatisticsEnabled(true);
+				cacheManager.createCache("custom1", config);
+				cacheManager.destroyCache("bar");
 			};
 		}
 
@@ -1053,15 +1048,7 @@ public class CacheAutoConfigurationTests {
 		@Bean
 		// The @Bean annotation is important, see CachingConfigurerSupport Javadoc
 		public CacheResolver cacheResolver() {
-			return new CacheResolver() {
-
-				@Override
-				public Collection<? extends Cache> resolveCaches(
-						CacheOperationInvocationContext<?> context) {
-					return Collections.singleton(mock(Cache.class));
-				}
-
-			};
+			return (context) -> Collections.singleton(mock(Cache.class));
 
 		}
 

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

@@ -27,9 +27,6 @@ import javax.cache.configuration.Configuration;
 import javax.cache.configuration.OptionalFeature;
 import javax.cache.spi.CachingProvider;
 
-import org.mockito.invocation.InvocationOnMock;
-import org.mockito.stubbing.Answer;
-
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.BDDMockito.given;
@@ -52,24 +49,17 @@ public class MockCachingProvider implements CachingProvider {
 		given(cacheManager.getClassLoader()).willReturn(classLoader);
 		final Map<String, Cache> caches = new HashMap<>();
 		given(cacheManager.getCacheNames()).willReturn(caches.keySet());
-		given(cacheManager.getCache(anyString())).willAnswer(new Answer<Cache>() {
-			@Override
-			public Cache answer(InvocationOnMock invocationOnMock) throws Throwable {
-				String cacheName = (String) invocationOnMock.getArguments()[0];
-				return caches.get(cacheName);
-			}
+		given(cacheManager.getCache(anyString())).willAnswer((invocation) -> {
+			String cacheName = (String) invocation.getArguments()[0];
+			return caches.get(cacheName);
 		});
 		given(cacheManager.createCache(anyString(), any(Configuration.class)))
-				.will(new Answer<Cache>() {
-					@Override
-					public Cache answer(InvocationOnMock invocationOnMock)
-							throws Throwable {
-						String cacheName = (String) invocationOnMock.getArguments()[0];
-						Cache cache = mock(Cache.class);
-						given(cache.getName()).willReturn(cacheName);
-						caches.put(cacheName, cache);
-						return cache;
-					}
+				.will((invocation) -> {
+					String cacheName = (String) invocation.getArguments()[0];
+					Cache cache = mock(Cache.class);
+					given(cache.getName()).willReturn(cacheName);
+					caches.put(cacheName, cache);
+					return cache;
 				});
 		return cacheManager;
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfigurationTests.java

@@ -143,12 +143,7 @@ public class CassandraAutoConfigurationTests {
 
 		@Bean
 		public ClusterBuilderCustomizer customizer() {
-			return new ClusterBuilderCustomizer() {
-				@Override
-				public void customize(Cluster.Builder clusterBuilder) {
-					clusterBuilder.withClusterName("overridden-name");
-				}
-			};
+			return (clusterBuilder) -> clusterBuilder.withClusterName("overridden-name");
 		}
 
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/elasticsearch/jest/JestAutoConfigurationTests.java

@@ -24,7 +24,6 @@ import com.google.gson.Gson;
 import io.searchbox.action.Action;
 import io.searchbox.client.JestClient;
 import io.searchbox.client.JestResult;
-import io.searchbox.client.config.HttpClientConfig;
 import io.searchbox.client.http.JestHttpClient;
 import io.searchbox.core.Index;
 import io.searchbox.core.Search;
@@ -183,14 +182,7 @@ public class JestAutoConfigurationTests {
 
 		@Bean
 		public HttpClientConfigBuilderCustomizer customizer() {
-			return new HttpClientConfigBuilderCustomizer() {
-
-				@Override
-				public void customize(HttpClientConfig.Builder builder) {
-					builder.gson(BuilderCustomizer.this.gson);
-				}
-
-			};
+			return (builder) -> builder.gson(BuilderCustomizer.this.gson);
 		}
 
 		Gson getGson() {

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jackson/JacksonAutoConfigurationTests.java

@@ -533,13 +533,7 @@ public class JacksonAutoConfigurationTests {
 
 		@Bean
 		public Jackson2ObjectMapperBuilderCustomizer customDateFormat() {
-			return new Jackson2ObjectMapperBuilderCustomizer() {
-				@Override
-				public void customize(
-						Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder) {
-					jackson2ObjectMapperBuilder.dateFormat(new MyDateFormat());
-				}
-			};
+			return (builder) -> builder.dateFormat(new MyDateFormat());
 		}
 
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/DataSourceInitializerTests.java

@@ -350,14 +350,8 @@ public class DataSourceInitializerTests {
 		@Override
 		public Resource[] getResources(String locationPattern) throws IOException {
 			Resource[] resources = this.resolver.getResources(locationPattern);
-			Arrays.sort(resources, new Comparator<Resource>() {
-
-				@Override
-				public int compare(Resource r1, Resource r2) {
-					return r2.getFilename().compareTo(r1.getFilename());
-				}
-
-			});
+			Arrays.sort(resources,
+					Comparator.comparing(Resource::getFilename).reversed());
 			return resources;
 		}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/metadata/AbstractDataSourcePoolMetadataTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,13 +16,9 @@
 
 package org.springframework.boot.autoconfigure.jdbc.metadata;
 
-import java.sql.Connection;
-import java.sql.SQLException;
-
 import org.junit.Test;
 
 import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
-import org.springframework.dao.DataAccessException;
 import org.springframework.jdbc.core.ConnectionCallback;
 import org.springframework.jdbc.core.JdbcTemplate;
 
@@ -57,13 +53,7 @@ public abstract class AbstractDataSourcePoolMetadataTests<D extends AbstractData
 		// Make sure the pool is initialized
 		JdbcTemplate jdbcTemplate = new JdbcTemplate(
 				getDataSourceMetadata().getDataSource());
-		jdbcTemplate.execute(new ConnectionCallback<Void>() {
-			@Override
-			public Void doInConnection(Connection connection)
-					throws SQLException, DataAccessException {
-				return null;
-			}
-		});
+		jdbcTemplate.execute((ConnectionCallback<Void>) (connection) -> null);
 		assertThat(getDataSourceMetadata().getActive()).isEqualTo(Integer.valueOf(0));
 		assertThat(getDataSourceMetadata().getUsage()).isEqualTo(Float.valueOf(0));
 	}
@@ -72,16 +62,10 @@ public abstract class AbstractDataSourcePoolMetadataTests<D extends AbstractData
 	public void getPoolSizeOneConnection() {
 		JdbcTemplate jdbcTemplate = new JdbcTemplate(
 				getDataSourceMetadata().getDataSource());
-		jdbcTemplate.execute(new ConnectionCallback<Void>() {
-			@Override
-			public Void doInConnection(Connection connection)
-					throws SQLException, DataAccessException {
-				assertThat(getDataSourceMetadata().getActive())
-						.isEqualTo(Integer.valueOf(1));
-				assertThat(getDataSourceMetadata().getUsage())
-						.isEqualTo(Float.valueOf(0.5F));
-				return null;
-			}
+		jdbcTemplate.execute((ConnectionCallback<Void>) (connection) -> {
+			assertThat(getDataSourceMetadata().getActive()).isEqualTo(Integer.valueOf(1));
+			assertThat(getDataSourceMetadata().getUsage()).isEqualTo(Float.valueOf(0.5F));
+			return null;
 		});
 	}
 
@@ -89,25 +73,13 @@ public abstract class AbstractDataSourcePoolMetadataTests<D extends AbstractData
 	public void getPoolSizeTwoConnections() {
 		final JdbcTemplate jdbcTemplate = new JdbcTemplate(
 				getDataSourceMetadata().getDataSource());
-		jdbcTemplate.execute(new ConnectionCallback<Void>() {
-
-			@Override
-			public Void doInConnection(Connection connection)
-					throws SQLException, DataAccessException {
-				jdbcTemplate.execute(new ConnectionCallback<Void>() {
-
-					@Override
-					public Void doInConnection(Connection connection)
-							throws SQLException, DataAccessException {
-						assertThat(getDataSourceMetadata().getActive()).isEqualTo(2);
-						assertThat(getDataSourceMetadata().getUsage()).isEqualTo(1.0f);
-						return null;
-					}
-
-				});
+		jdbcTemplate.execute((ConnectionCallback<Void>) (connection) -> {
+			jdbcTemplate.execute((ConnectionCallback<Void>) connection1 -> {
+				assertThat(getDataSourceMetadata().getActive()).isEqualTo(2);
+				assertThat(getDataSourceMetadata().getUsage()).isEqualTo(1.0f);
 				return null;
-			}
-
+			});
+			return null;
 		});
 	}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jms/artemis/ArtemisAutoConfigurationTests.java

@@ -23,7 +23,6 @@ import java.util.UUID;
 import javax.jms.Destination;
 import javax.jms.JMSException;
 import javax.jms.Message;
-import javax.jms.Session;
 import javax.jms.TextMessage;
 
 import org.apache.activemq.artemis.api.core.TransportConfiguration;
@@ -336,25 +335,22 @@ public class ArtemisAutoConfigurationTests {
 
 		public void checkDestination(final String name, final boolean pubSub,
 				final boolean shouldExist) {
-			this.jmsTemplate.execute(new SessionCallback<Void>() {
-				@Override
-				public Void doInJms(Session session) throws JMSException {
-					try {
-						Destination destination = DestinationChecker.this.destinationResolver
-								.resolveDestinationName(session, name, pubSub);
-						if (!shouldExist) {
-							throw new IllegalStateException("Destination '" + name
-									+ "' was not expected but got " + destination);
-						}
+			this.jmsTemplate.execute((SessionCallback<Void>) (session) -> {
+				try {
+					Destination destination = this.destinationResolver
+							.resolveDestinationName(session, name, pubSub);
+					if (!shouldExist) {
+						throw new IllegalStateException("Destination '" + name
+								+ "' was not expected but got " + destination);
 					}
-					catch (JMSException e) {
-						if (shouldExist) {
-							throw new IllegalStateException("Destination '" + name
-									+ "' was expected but got " + e.getMessage());
-						}
-					}
-					return null;
 				}
+				catch (JMSException ex) {
+					if (shouldExist) {
+						throw new IllegalStateException("Destination '" + name
+								+ "' was expected but got " + ex.getMessage());
+					}
+				}
+				return null;
 			});
 		}
 
@@ -408,13 +404,9 @@ public class ArtemisAutoConfigurationTests {
 
 		@Bean
 		public ArtemisConfigurationCustomizer myArtemisCustomize() {
-			return new ArtemisConfigurationCustomizer() {
-				@Override
-				public void customize(
-						org.apache.activemq.artemis.core.config.Configuration configuration) {
-					configuration.setClusterPassword("Foobar");
-					configuration.setName("customFooBar");
-				}
+			return (configuration) -> {
+				configuration.setClusterPassword("Foobar");
+				configuration.setName("customFooBar");
 			};
 		}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/logging/AutoConfigurationReportLoggingInitializerTests.java

@@ -62,9 +62,8 @@ public class AutoConfigurationReportLoggingInitializerTests {
 		this.initializer.initialize(context);
 		context.register(Config.class);
 		context.refresh();
-		withDebugLogging(() -> {
-			this.initializer.onApplicationEvent(new ContextRefreshedEvent(context));
-		});
+		withDebugLogging(() -> this.initializer
+				.onApplicationEvent(new ContextRefreshedEvent(context)));
 		assertThat(this.outputCapture.toString()).contains("AUTO-CONFIGURATION REPORT");
 	}
 
@@ -78,10 +77,9 @@ public class AutoConfigurationReportLoggingInitializerTests {
 			fail("Did not error");
 		}
 		catch (Exception ex) {
-			withDebugLogging(() -> {
-				this.initializer.onApplicationEvent(new ApplicationFailedEvent(
-						new SpringApplication(), new String[0], context, ex));
-			});
+			withDebugLogging(
+					() -> this.initializer.onApplicationEvent(new ApplicationFailedEvent(
+							new SpringApplication(), new String[0], context, ex)));
 		}
 		assertThat(this.outputCapture.toString()).contains("AUTO-CONFIGURATION REPORT");
 	}
@@ -112,9 +110,8 @@ public class AutoConfigurationReportLoggingInitializerTests {
 		ConditionEvaluationReport.get(context.getBeanFactory())
 				.recordExclusions(Arrays.asList("com.foo.Bar"));
 		context.refresh();
-		withDebugLogging(() -> {
-			this.initializer.onApplicationEvent(new ContextRefreshedEvent(context));
-		});
+		withDebugLogging(() -> this.initializer
+				.onApplicationEvent(new ContextRefreshedEvent(context)));
 		assertThat(this.outputCapture.toString())
 				.contains("not a servlet web application (OnWebApplicationCondition)");
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/SecurityAutoConfigurationTests.java

@@ -50,7 +50,6 @@ import org.springframework.security.config.annotation.authentication.configurers
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
 import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
-import org.springframework.security.core.Authentication;
 import org.springframework.security.core.AuthenticationException;
 import org.springframework.security.core.authority.AuthorityUtils;
 import org.springframework.security.core.userdetails.UserDetailsService;
@@ -407,14 +406,8 @@ public class SecurityAutoConfigurationTests {
 
 		@Bean
 		public AuthenticationManager myAuthenticationManager() {
-			this.authenticationManager = new AuthenticationManager() {
-
-				@Override
-				public Authentication authenticate(Authentication authentication)
-						throws AuthenticationException {
-					return new TestingAuthenticationToken("foo", "bar");
-				}
-			};
+			this.authenticationManager = (
+					authentication) -> new TestingAuthenticationToken("foo", "bar");
 			return this.authenticationManager;
 		}
 
@@ -446,14 +439,8 @@ public class SecurityAutoConfigurationTests {
 
 		@Override
 		protected void configure(HttpSecurity http) throws Exception {
-			this.authenticationManager = new AuthenticationManager() {
-				@Override
-				public Authentication authenticate(Authentication authentication)
-						throws AuthenticationException {
-					return WorkaroundSecurityCustomizer.this.builder.getOrBuild()
-							.authenticate(authentication);
-				}
-			};
+			this.authenticationManager = (authentication) -> this.builder.getOrBuild()
+					.authenticate(authentication);
 		}
 
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/oauth2/resource/ResourceServerTokenServicesConfigurationTests.java

@@ -16,10 +16,6 @@
 
 package org.springframework.boot.autoconfigure.security.oauth2.resource;
 
-import java.io.IOException;
-import java.util.List;
-import java.util.Map;
-
 import org.junit.After;
 import org.junit.Rule;
 import org.junit.Test;
@@ -45,14 +41,9 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.StandardEnvironment;
-import org.springframework.http.HttpRequest;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
-import org.springframework.http.client.ClientHttpRequestExecution;
-import org.springframework.http.client.ClientHttpRequestInterceptor;
-import org.springframework.http.client.ClientHttpResponse;
 import org.springframework.mock.http.client.MockClientHttpResponse;
-import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.AuthorityUtils;
 import org.springframework.security.oauth2.client.OAuth2RestTemplate;
 import org.springframework.security.oauth2.client.token.grant.code.AuthorizationCodeResourceDetails;
@@ -299,16 +290,8 @@ public class ResourceServerTokenServicesConfigurationTests {
 
 		@Bean
 		AuthoritiesExtractor authoritiesExtractor() {
-			return new AuthoritiesExtractor() {
-
-				@Override
-				public List<GrantedAuthority> extractAuthorities(
-						Map<String, Object> map) {
-					return AuthorityUtils
-							.commaSeparatedStringToAuthorityList("ROLE_ADMIN");
-				}
-
-			};
+			return (map) -> AuthorityUtils
+					.commaSeparatedStringToAuthorityList("ROLE_ADMIN");
 		}
 
 	}
@@ -318,14 +301,7 @@ public class ResourceServerTokenServicesConfigurationTests {
 
 		@Bean
 		PrincipalExtractor principalExtractor() {
-			return new PrincipalExtractor() {
-
-				@Override
-				public Object extractPrincipal(Map<String, Object> map) {
-					return "boot";
-				}
-
-			};
+			return (map) -> "boot";
 		}
 
 	}
@@ -372,15 +348,8 @@ public class ResourceServerTokenServicesConfigurationTests {
 
 		@Override
 		public void customize(OAuth2RestTemplate template) {
-			template.getInterceptors().add(new ClientHttpRequestInterceptor() {
-
-				@Override
-				public ClientHttpResponse intercept(HttpRequest request, byte[] body,
-						ClientHttpRequestExecution execution) throws IOException {
-					return execution.execute(request, body);
-				}
-
-			});
+			template.getInterceptors()
+					.add((request, body, execution) -> execution.execute(request, body));
 		}
 
 	}
@@ -434,18 +403,12 @@ public class ResourceServerTokenServicesConfigurationTests {
 
 		@Override
 		public void customize(RestTemplate template) {
-			template.getInterceptors().add(new ClientHttpRequestInterceptor() {
-
-				@Override
-				public ClientHttpResponse intercept(HttpRequest request, byte[] body,
-						ClientHttpRequestExecution execution) throws IOException {
-					String payload = "{\"value\":\"FOO\"}";
-					MockClientHttpResponse response = new MockClientHttpResponse(
-							payload.getBytes(), HttpStatus.OK);
-					response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
-					return response;
-				}
-
+			template.getInterceptors().add((request, body, execution) -> {
+				String payload = "{\"value\":\"FOO\"}";
+				MockClientHttpResponse response = new MockClientHttpResponse(
+						payload.getBytes(), HttpStatus.OK);
+				response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
+				return response;
 			});
 		}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/client/RestTemplateAutoConfigurationTests.java

@@ -154,13 +154,8 @@ public class RestTemplateAutoConfigurationTests {
 		}
 
 		private void breakBuilderOnNextCall(RestTemplateBuilder builder) {
-			builder.additionalCustomizers(new RestTemplateCustomizer() {
-
-				@Override
-				public void customize(RestTemplate restTemplate) {
-					throw new IllegalStateException();
-				}
-
+			builder.additionalCustomizers((restTemplate) -> {
+				throw new IllegalStateException();
 			});
 		}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/MockServletWebServerFactory.java

@@ -69,7 +69,7 @@ public class MockServletWebServerFactory extends AbstractServletWebServerFactory
 
 		public MockServletWebServer(ServletContextInitializer[] initializers, int port) {
 			super(Arrays.stream(initializers)
-					.map((i) -> (Initializer) (s) -> i.onStartup(s))
+					.map((initializer) -> (Initializer) initializer::onStartup)
 					.toArray(Initializer[]::new), port);
 		}