Switch anonymous inner classes to lambdas

See gh-33987

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/mock/mockito/SpyBeanWithJdkProxyTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -16,8 +16,6 @@
 
 package org.springframework.boot.test.mock.mockito;
 
-import java.lang.reflect.InvocationHandler;
-import java.lang.reflect.Method;
 import java.lang.reflect.Proxy;
 
 import org.junit.jupiter.api.Test;
@@ -60,14 +58,7 @@ class SpyBeanWithJdkProxyTests {
 		@Bean
 		ExampleRepository dateService() {
 			return (ExampleRepository) Proxy.newProxyInstance(getClass().getClassLoader(),
-					new Class<?>[] { ExampleRepository.class }, new InvocationHandler() {
-
-						@Override
-						public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
-							return new Example((String) args[0]);
-						}
-
-					});
+					new Class<?>[] { ExampleRepository.class }, (proxy, method, args) -> new Example((String) args[0]));
 		}
 
 	}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-flyway/src/main/java/smoketest/flyway/SampleFlywayApplication.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -30,14 +30,7 @@ public class SampleFlywayApplication {
 
 	@Bean
 	public CommandLineRunner runner(PersonRepository repository) {
-		return new CommandLineRunner() {
-
-			@Override
-			public void run(String... args) throws Exception {
-				System.err.println(repository.findAll());
-			}
-
-		};
+		return (args) -> System.err.println(repository.findAll());
 	}
 
 }

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-jersey/src/test/java/smoketest/jersey/AbstractJerseyManagementPortTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -19,7 +19,6 @@ package smoketest.jersey;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 
-import org.glassfish.jersey.server.ResourceConfig;
 import org.junit.jupiter.api.Test;
 import smoketest.jersey.AbstractJerseyManagementPortTests.ResourceConfigConfiguration;
 
@@ -90,12 +89,7 @@ class AbstractJerseyManagementPortTests {
 
 		@Bean
 		ResourceConfigCustomizer customizer() {
-			return new ResourceConfigCustomizer() {
-				@Override
-				public void customize(ResourceConfig config) {
-					config.register(TestEndpoint.class);
-				}
-			};
+			return (config) -> config.register(TestEndpoint.class);
 		}
 
 		@Path("/test")