Merge pull request #13795 from dsyer:gh-13490

* pr/13795:
  Make some nested private classes package private

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/HazelcastJCacheCustomizationConfiguration.java

@@ -43,8 +43,7 @@ class HazelcastJCacheCustomizationConfiguration {
 		return new HazelcastPropertiesCustomizer(hazelcastInstance.getIfUnique());
 	}
 
-	private static class HazelcastPropertiesCustomizer
-			implements JCachePropertiesCustomizer {
+	static class HazelcastPropertiesCustomizer implements JCachePropertiesCustomizer {
 
 		private final HazelcastInstance hazelcastInstance;
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/WebFluxAutoConfiguration.java

@@ -292,7 +292,7 @@ public class WebFluxAutoConfiguration {
 
 	}
 
-	private static class ResourceChainResourceHandlerRegistrationCustomizer
+	static class ResourceChainResourceHandlerRegistrationCustomizer
 			implements ResourceHandlerRegistrationCustomizer {
 
 		@Autowired

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

@@ -598,7 +598,7 @@ public class WebMvcAutoConfiguration {
 
 	}
 
-	private static class ResourceChainResourceHandlerRegistrationCustomizer
+	static class ResourceChainResourceHandlerRegistrationCustomizer
 			implements ResourceHandlerRegistrationCustomizer {
 
 		@Autowired