Fix init order issue in RequestMappingHandlerMapping

Issue: SPR-10173

Author: rstoyanchev

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerMapping.java

@@ -157,10 +157,10 @@ public List<String> getFileExtensions() {
 
 	@Override
 	public void afterPropertiesSet() {
-		super.afterPropertiesSet();
 		if (this.useRegisteredSuffixPatternMatch) {
 			this.fileExtensions.addAll(contentNegotiationManager.getAllFileExtensions());
 		}
+		super.afterPropertiesSet();
 	}
 
 	/**

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerMappingTests.java

@@ -15,20 +15,28 @@
  */
 package org.springframework.web.servlet.mvc.method.annotation;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 
+import java.lang.reflect.Method;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 import org.junit.Before;
 import org.junit.Test;
 import org.springframework.http.MediaType;
+import org.springframework.stereotype.Controller;
 import org.springframework.util.StringValueResolver;
 import org.springframework.web.accept.ContentNegotiationManager;
 import org.springframework.web.accept.PathExtensionContentNegotiationStrategy;
+import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.context.support.StaticWebApplicationContext;
-import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
+import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
 
 /**
  * Tests for {@link RequestMappingHandlerMapping}.
@@ -63,6 +71,35 @@ public void useRegsiteredSuffixPatternMatch() {
 		assertEquals(Arrays.asList("json"), this.handlerMapping.getFileExtensions());
 	}
 
+	@Test
+	public void useRegsiteredSuffixPatternMatchInitialization() {
+
+		Map<String, MediaType> fileExtensions = Collections.singletonMap("json", MediaType.APPLICATION_JSON);
+		PathExtensionContentNegotiationStrategy strategy = new PathExtensionContentNegotiationStrategy(fileExtensions);
+		ContentNegotiationManager manager = new ContentNegotiationManager(strategy);
+
+		final Set<String> extensions = new HashSet<String>();
+
+		RequestMappingHandlerMapping hm = new RequestMappingHandlerMapping() {
+			@Override
+			protected RequestMappingInfo getMappingForMethod(Method method, Class<?> handlerType) {
+				extensions.addAll(getFileExtensions());
+				return super.getMappingForMethod(method, handlerType);
+			}
+		};
+
+		StaticWebApplicationContext wac = new StaticWebApplicationContext();
+		wac.registerSingleton("testController", TestController.class);
+		wac.refresh();
+
+		hm.setContentNegotiationManager(manager);
+		hm.setUseRegisteredSuffixPatternMatch(true);
+		hm.setApplicationContext(wac);
+		hm.afterPropertiesSet();
+
+		assertEquals(Collections.singleton("json"), extensions);
+	}
+
 	@Test
 	public void useSuffixPatternMatch() {
 		assertTrue(this.handlerMapping.useSuffixPatternMatch());
@@ -93,4 +130,13 @@ public String resolveStringValue(String value) {
 		assertArrayEquals(new String[] { "/foo", "/foo/bar" }, result);
 	}
 
+
+	@Controller
+	static class TestController {
+
+		@RequestMapping
+		public void handle() {
+		}
+	}
+
 }