fixed @RequestParam(required=false) regression for @InitBinder methods (SPR-6878)

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/mvc/annotation/ServletAnnotationControllerTests.java

@@ -1479,11 +1479,13 @@ public class ServletAnnotationControllerTests {
 		}
 
 		@InitBinder
-		public void initBinder(@RequestParam("param1") T p1, int param2) {
+		public void initBinder(@RequestParam("param1") String p1, @RequestParam(value="paramX", required=false) String px, int param2) {
+			assertNull(px);
 		}
 
 		@ModelAttribute
-		public void modelAttribute(@RequestParam("param1") T p1, int param2) {
+		public void modelAttribute(@RequestParam("param1") String p1, @RequestParam(value="paramX", required=false) String px, int param2) {
+			assertNull(px);
 		}
 	}
 
@@ -1516,12 +1518,14 @@ public class ServletAnnotationControllerTests {
 
 		@Override
 		@InitBinder
-		public void initBinder(@RequestParam("param1") String p1, int param2) {
+		public void initBinder(@RequestParam("param1") String p1, @RequestParam(value="paramX", required=false) String px, int param2) {
+			assertNull(px);
 		}
 
 		@Override
 		@ModelAttribute
-		public void modelAttribute(@RequestParam("param1") String p1, int param2) {
+		public void modelAttribute(@RequestParam("param1") String p1, @RequestParam(value="paramX", required=false) String px, int param2) {
+			assertNull(px);
 		}
 	}
 

org.springframework.web/src/main/java/org/springframework/web/bind/annotation/support/HandlerMethodInvoker.java

@@ -358,7 +358,7 @@ public class HandlerMethodInvoker {
 					RequestParam requestParam = (RequestParam) paramAnn;
 					paramName = requestParam.value();
 					paramRequired = requestParam.required();
-					paramDefaultValue = requestParam.defaultValue();
+					paramDefaultValue = parseDefaultValueAttribute(requestParam.defaultValue());
 					break;
 				}
 				else if (ModelAttribute.class.isInstance(paramAnn)) {