Fix missing ResourceHttpRequestHandler init in registry

Issue: SPR-14577
Cherry-picked from: 7a88776

Author: bclozel

spring-webmvc/src/main/java/org/springframework/web/servlet/config/annotation/ResourceHandlerRegistry.java

@@ -142,6 +142,7 @@ protected AbstractHandlerMapping getHandlerMapping() {
 				handler.setContentNegotiationManager(this.contentNegotiationManager);
 				try {
 					handler.afterPropertiesSet();
+					handler.afterSingletonsInstantiated();
 				}
 				catch (Exception ex) {
 					throw new BeanInitializationException("Failed to init ResourceHttpRequestHandler", ex);

spring-webmvc/src/test/java/org/springframework/web/servlet/config/annotation/ResourceHandlerRegistryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -79,8 +79,6 @@ public void mapPathToLocation() throws Exception {
 		request.setAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE, "/testStylesheet.css");
 
 		ResourceHttpRequestHandler handler = getHandler("/resources/**");
-		handler.afterPropertiesSet();
-		handler.afterSingletonsInstantiated();
 		handler.handleRequest(request, this.response);
 
 		assertEquals("test stylesheet content", this.response.getContentAsString());