all @SessionAttributes get exposed to the model before handler method...

all @SessionAttributes get exposed to the model before handler method execution; MultipartRequest is available as a mixin interface on (Native)WebRequest as well

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

@@ -102,6 +102,7 @@ import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.SessionAttributes;
 import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
 import org.springframework.web.bind.support.WebArgumentResolver;
 import org.springframework.web.bind.support.WebBindingInitializer;
@@ -117,7 +118,6 @@ import org.springframework.web.servlet.mvc.AbstractController;
 import org.springframework.web.servlet.mvc.multiaction.InternalPathMethodNameResolver;
 import org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping;
 import org.springframework.web.servlet.view.InternalResourceViewResolver;
-import org.springframework.web.servlet.view.RedirectView;
 import org.springframework.web.util.NestedServletException;
 
 /**
@@ -293,6 +293,39 @@ public class ServletAnnotationControllerTests {
 		assertEquals("", response.getContentAsString());
 	}
 
+	@Test
+	public void sessionAttributeExposure() throws Exception {
+		@SuppressWarnings("serial") DispatcherServlet servlet = new DispatcherServlet() {
+			@Override
+			protected WebApplicationContext createWebApplicationContext(WebApplicationContext parent) {
+				GenericWebApplicationContext wac = new GenericWebApplicationContext();
+				wac.registerBeanDefinition("controller", new RootBeanDefinition(MySessionAttributesController.class));
+				wac.registerBeanDefinition("viewResolver", new RootBeanDefinition(ModelExposingViewResolver.class));
+				wac.refresh();
+				return wac;
+			}
+		};
+		servlet.init(new MockServletConfig());
+
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/myPage");
+		MockHttpServletResponse response = new MockHttpServletResponse();
+		servlet.service(request, response);
+		HttpSession session = request.getSession();
+		assertTrue(session.getAttribute("object1") != null);
+		assertTrue(session.getAttribute("object2") != null);
+		assertTrue(((Map) session.getAttribute("model")).containsKey("object1"));
+		assertTrue(((Map) session.getAttribute("model")).containsKey("object2"));
+
+		request = new MockHttpServletRequest("POST", "/myPage");
+		request.setSession(session);
+		response = new MockHttpServletResponse();
+		servlet.service(request, response);
+		assertTrue(session.getAttribute("object1") != null);
+		assertTrue(session.getAttribute("object2") != null);
+		assertTrue(((Map) session.getAttribute("model")).containsKey("object1"));
+		assertTrue(((Map) session.getAttribute("model")).containsKey("object2"));
+	}
+
 	@Test
 	public void adaptedHandleMethods() throws Exception {
 		doTestAdaptedHandleMethods(MyAdaptedController.class);
@@ -1029,16 +1062,6 @@ public class ServletAnnotationControllerTests {
 		assertEquals(201, response.getStatus());
 	}
 
-	@Test
-	public void responseStatusRedirect() throws ServletException, IOException {
-		initServlet(ResponseStatusRedirectController.class);
-
-		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/something");
-		MockHttpServletResponse response = new MockHttpServletResponse();
-		servlet.service(request, response);
-		assertEquals(201, response.getStatus());
-	}
-
 	@Test
 	public void mavResolver() throws ServletException, IOException {
 		@SuppressWarnings("serial") DispatcherServlet servlet = new DispatcherServlet() {
@@ -1248,6 +1271,25 @@ public class ServletAnnotationControllerTests {
 		}
 	}
 
+	@Controller
+	@RequestMapping("/myPage")
+	@SessionAttributes({"object1", "object2"})
+	public static class MySessionAttributesController {
+
+		@RequestMapping(method = RequestMethod.GET)
+		public String get(Model model) {
+			model.addAttribute("object1", new Object());
+			model.addAttribute("object2", new Object());
+			return "myPage";
+		}
+
+		@RequestMapping(method = RequestMethod.POST)
+		public String post(@ModelAttribute("object1") Object object1) {
+			//do something with object1
+			return "myPage";
+		}
+	}
+
 	@Controller
 	public static class MyFormController {
 
@@ -1592,6 +1634,20 @@ public class ServletAnnotationControllerTests {
 		}
 	}
 
+	private static class ModelExposingViewResolver implements ViewResolver {
+
+		public View resolveViewName(String viewName, Locale locale) throws Exception {
+			return new View() {
+				public String getContentType() {
+					return null;
+				}
+				public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response) {
+					request.getSession().setAttribute("model", model);
+				}
+			};
+		}
+	}
+
 	public static class ParentController {
 
 		@RequestMapping(method = RequestMethod.GET)
@@ -1769,17 +1825,6 @@ public class ServletAnnotationControllerTests {
 		}
 	}
 
-	@Controller
-	public static class ResponseStatusRedirectController {
-
-		@RequestMapping("/something")
-		@ResponseStatus(HttpStatus.CREATED)
-		public RedirectView handle(Writer writer) throws IOException {
-			return new RedirectView("somelocation.html", false, false);
-		}
-	}
-
-
 	@Controller
 	public static class ModelAndViewResolverController {
 

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

@@ -66,7 +66,6 @@ import org.springframework.web.bind.support.WebBindingInitializer;
 import org.springframework.web.bind.support.WebRequestDataBinder;
 import org.springframework.web.context.request.NativeWebRequest;
 import org.springframework.web.context.request.WebRequest;
-import org.springframework.web.multipart.MultipartRequest;
 
 /**
  * Support class for invoking an annotated handler method. Operates on the introspection results of a
@@ -127,21 +126,32 @@ public class HandlerMethodInvoker {
 		Method handlerMethodToInvoke = BridgeMethodResolver.findBridgedMethod(handlerMethod);
 		try {
 			boolean debug = logger.isDebugEnabled();
+			for (String attrName : this.methodResolver.getActualSessionAttributeNames()) {
+				Object attrValue = this.sessionAttributeStore.retrieveAttribute(webRequest, attrName);
+				if (attrValue != null) {
+					implicitModel.addAttribute(attrName, attrValue);
+				}
+			}
 			for (Method attributeMethod : this.methodResolver.getModelAttributeMethods()) {
 				Method attributeMethodToInvoke = BridgeMethodResolver.findBridgedMethod(attributeMethod);
 				Object[] args = resolveHandlerArguments(attributeMethodToInvoke, handler, webRequest, implicitModel);
 				if (debug) {
 					logger.debug("Invoking model attribute method: " + attributeMethodToInvoke);
 				}
-				Object attrValue = doInvokeMethod(attributeMethodToInvoke, handler, args);
 				String attrName = AnnotationUtils.findAnnotation(attributeMethodToInvoke, ModelAttribute.class).value();
+				if (!"".equals(attrName) && implicitModel.containsAttribute(attrName)) {
+					continue;
+				}
+				Object attrValue = doInvokeMethod(attributeMethodToInvoke, handler, args);
 				if ("".equals(attrName)) {
 					Class resolvedType = GenericTypeResolver.resolveReturnType(
 							attributeMethodToInvoke, handler.getClass());
 					attrName = Conventions.getVariableNameForReturnType(
 							attributeMethodToInvoke, resolvedType, attrValue);
 				}
-				implicitModel.addAttribute(attrName, attrValue);
+				if (!implicitModel.containsAttribute(attrName)) {
+					implicitModel.addAttribute(attrName, attrValue);
+				}
 			}
 			Object[] args = resolveHandlerArguments(handlerMethodToInvoke, handler, webRequest, implicitModel);
 			if (debug) {
@@ -394,15 +404,15 @@ public class HandlerMethodInvoker {
 		if (paramName.length() == 0) {
 			paramName = getRequiredParameterName(methodParam);
 		}
-		Object paramValue = null;
-		if (webRequest.getNativeRequest() instanceof MultipartRequest) {
-			paramValue = ((MultipartRequest) webRequest.getNativeRequest()).getFile(paramName);
-		}
+		Object paramValue = webRequest.getFile(paramName);
 		if (paramValue == null) {
 			String[] paramValues = webRequest.getParameterValues(paramName);
-			if (paramValues != null) {
+			if (paramValues != null && !paramType.isArray()) {
 				paramValue = (paramValues.length == 1 ? paramValues[0] : paramValues);
 			}
+			else {
+				paramValue = paramValues;
+			}
 		}
 		if (paramValue == null) {
 			if (StringUtils.hasText(defaultValue)) {

org.springframework.web/src/main/java/org/springframework/web/bind/support/WebRequestDataBinder.java

 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2009 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 org.springframework.web.bind.support;
 import org.springframework.beans.MutablePropertyValues;
 import org.springframework.validation.BindException;
 import org.springframework.web.bind.WebDataBinder;
-import org.springframework.web.context.request.NativeWebRequest;
 import org.springframework.web.context.request.WebRequest;
 import org.springframework.web.multipart.MultipartRequest;
 
@@ -100,12 +99,8 @@ public class WebRequestDataBinder extends WebDataBinder {
 	 */
 	public void bind(WebRequest request) {
 		MutablePropertyValues mpvs = new MutablePropertyValues(request.getParameterMap());
-		if (request instanceof NativeWebRequest) {
-			Object nativeRequest = ((NativeWebRequest) request).getNativeRequest();
-			if (nativeRequest instanceof MultipartRequest) {
-				MultipartRequest multipartRequest = (MultipartRequest) request;
-				bindMultipartFiles(multipartRequest.getFileMap(), mpvs);
-			}
+		if (request instanceof MultipartRequest) {
+			bindMultipartFiles(((MultipartRequest) request).getFileMap(), mpvs);
 		}
 		doBind(mpvs);
 	}

org.springframework.web/src/main/java/org/springframework/web/context/request/FacesWebRequest.java

 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2009 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.
@@ -17,14 +17,19 @@
 package org.springframework.web.context.request;
 
 import java.security.Principal;
+import java.util.Collections;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import javax.faces.context.ExternalContext;
 import javax.faces.context.FacesContext;
 
-import org.springframework.util.CollectionUtils;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
 import org.springframework.util.StringUtils;
+import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.multipart.MultipartRequest;
 
 /**
  * {@link WebRequest} adapter for a JSF {@link javax.faces.context.FacesContext}.
@@ -34,6 +39,9 @@ import org.springframework.util.StringUtils;
  */
 public class FacesWebRequest extends FacesRequestAttributes implements NativeWebRequest {
 
+	private MultipartRequest multipartRequest;
+
+
 	/**
 	 * Create a new FacesWebRequest adapter for the given FacesContext.
 	 * @param facesContext the current FacesContext
@@ -41,6 +49,9 @@ public class FacesWebRequest extends FacesRequestAttributes implements NativeWeb
 	 */
 	public FacesWebRequest(FacesContext facesContext) {
 		super(facesContext);
+		if (facesContext.getExternalContext().getRequest() instanceof MultipartRequest) {
+			this.multipartRequest = (MultipartRequest) facesContext.getExternalContext().getRequest();
+		}
 	}
 
 
@@ -105,7 +116,6 @@ public class FacesWebRequest extends FacesRequestAttributes implements NativeWeb
 		return false;
 	}
 
-
 	public String getDescription(boolean includeClientInfo) {
 		ExternalContext externalContext = getExternalContext();
 		StringBuilder sb = new StringBuilder();
@@ -123,6 +133,44 @@ public class FacesWebRequest extends FacesRequestAttributes implements NativeWeb
 		return sb.toString();
 	}
 
+
+	@SuppressWarnings("unchecked")
+	public Iterator<String> getFileNames() {
+		if (this.multipartRequest == null) {
+			return (Iterator<String>) Collections.EMPTY_SET.iterator();
+		}
+		return this.multipartRequest.getFileNames();
+	}
+
+	public MultipartFile getFile(String name) {
+		if (this.multipartRequest == null) {
+			return null;
+		}
+		return this.multipartRequest.getFile(name);
+	}
+
+	public List<MultipartFile> getFiles(String name) {
+		if (this.multipartRequest == null) {
+			return null;
+		}
+		return this.multipartRequest.getFiles(name);
+	}
+
+	public Map<String, MultipartFile> getFileMap() {
+		if (this.multipartRequest == null) {
+			return Collections.emptyMap();
+		}
+		return this.multipartRequest.getFileMap();
+	}
+
+	public MultiValueMap<String, MultipartFile> getMultiFileMap() {
+		if (this.multipartRequest == null) {
+			return new LinkedMultiValueMap<String, MultipartFile>();
+		}
+		return this.multipartRequest.getMultiFileMap();
+	}
+
+
 	@Override
 	public String toString() {
 		return "FacesWebRequest: " + getDescription(true);

org.springframework.web/src/main/java/org/springframework/web/context/request/NativeWebRequest.java

 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2009 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.
@@ -16,6 +16,8 @@
 
 package org.springframework.web.context.request;
 
+import org.springframework.web.multipart.MultipartRequest;
+
 /**
  * Extension of the {@link WebRequest} interface, exposing the
  * native request and response objects in a generic fashion.
@@ -26,7 +28,7 @@ package org.springframework.web.context.request;
  * @author Juergen Hoeller
  * @since 2.5.2
  */
-public interface NativeWebRequest extends WebRequest {
+public interface NativeWebRequest extends WebRequest, MultipartRequest {
 
 	/**
 	 * Return the underlying native request object, if available.

org.springframework.web/src/main/java/org/springframework/web/context/request/ServletWebRequest.java

 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2009 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.
@@ -17,7 +17,9 @@
 package org.springframework.web.context.request;
 
 import java.security.Principal;
+import java.util.Collections;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import javax.servlet.http.HttpServletRequest;
@@ -25,8 +27,12 @@ import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 
 import org.springframework.util.CollectionUtils;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
 import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
+import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.multipart.MultipartRequest;
 
 /**
  * {@link WebRequest} adapter for an {@link javax.servlet.http.HttpServletRequest}.
@@ -41,6 +47,8 @@ public class ServletWebRequest extends ServletRequestAttributes implements Nativ
 	private static final String HEADER_LAST_MODIFIED = "Last-Modified";
 
 
+	private MultipartRequest multipartRequest;
+
 	private HttpServletResponse response;
 
 	private boolean notModified = false;
@@ -52,6 +60,9 @@ public class ServletWebRequest extends ServletRequestAttributes implements Nativ
 	 */
 	public ServletWebRequest(HttpServletRequest request) {
 		super(request);
+		if (request instanceof MultipartRequest) {
+			this.multipartRequest = (MultipartRequest) request;
+		}
 	}
 
 	/**
@@ -60,7 +71,7 @@ public class ServletWebRequest extends ServletRequestAttributes implements Nativ
 	 * @param response current HTTP response (for automatic last-modified handling)
 	 */
 	public ServletWebRequest(HttpServletRequest request, HttpServletResponse response) {
-		super(request);
+		this(request);
 		this.response = response;
 	}
 
@@ -133,7 +144,6 @@ public class ServletWebRequest extends ServletRequestAttributes implements Nativ
 		return getRequest().isSecure();
 	}
 
-
 	public boolean checkNotModified(long lastModifiedTimestamp) {
 		if (lastModifiedTimestamp >= 0 && !this.notModified &&
 				(this.response == null || !this.response.containsHeader(HEADER_LAST_MODIFIED))) {
@@ -155,7 +165,6 @@ public class ServletWebRequest extends ServletRequestAttributes implements Nativ
 		return this.notModified;
 	}
 
-
 	public String getDescription(boolean includeClientInfo) {
 		HttpServletRequest request = getRequest();
 		StringBuilder sb = new StringBuilder();
@@ -177,6 +186,44 @@ public class ServletWebRequest extends ServletRequestAttributes implements Nativ
 		return sb.toString();
 	}
 
+
+	@SuppressWarnings("unchecked")
+	public Iterator<String> getFileNames() {
+		if (this.multipartRequest == null) {
+			return (Iterator<String>) Collections.EMPTY_SET.iterator();
+		}
+		return this.multipartRequest.getFileNames();
+	}
+
+	public MultipartFile getFile(String name) {
+		if (this.multipartRequest == null) {
+			return null;
+		}
+		return this.multipartRequest.getFile(name);
+	}
+
+	public List<MultipartFile> getFiles(String name) {
+		if (this.multipartRequest == null) {
+			return null;
+		}
+		return this.multipartRequest.getFiles(name);
+	}
+
+	public Map<String, MultipartFile> getFileMap() {
+		if (this.multipartRequest == null) {
+			return Collections.emptyMap();
+		}
+		return this.multipartRequest.getFileMap();
+	}
+
+	public MultiValueMap<String, MultipartFile> getMultiFileMap() {
+		if (this.multipartRequest == null) {
+			return new LinkedMultiValueMap<String, MultipartFile>();
+		}
+		return this.multipartRequest.getMultiFileMap();
+	}
+
+
 	@Override
 	public String toString() {
 		return "ServletWebRequest: " + getDescription(true);