SPR-6464 Add target request matching logic to DefaultFlashMapManager.

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/DispatcherServlet.java

@@ -53,7 +53,6 @@ import org.springframework.web.context.request.ServletWebRequest;
 import org.springframework.web.multipart.MultipartException;
 import org.springframework.web.multipart.MultipartHttpServletRequest;
 import org.springframework.web.multipart.MultipartResolver;
-import org.springframework.web.servlet.support.RequestContextUtils;
 import org.springframework.web.util.NestedServletException;
 import org.springframework.web.util.UrlPathHelper;
 import org.springframework.web.util.WebUtils;
@@ -815,7 +814,7 @@ public class DispatcherServlet extends FrameworkServlet {
 			}
 		}
 
-		boolean flashInitialized = this.flashMapManager.requestStarted(request);
+		this.flashMapManager.requestStarted(request);
 
 		// Make framework objects available to handlers and view objects.
 		request.setAttribute(WEB_APPLICATION_CONTEXT_ATTRIBUTE, getWebApplicationContext());
@@ -827,9 +826,8 @@ public class DispatcherServlet extends FrameworkServlet {
 			doDispatch(request, response);
 		}
 		finally {
-			if (flashInitialized) {
-				this.flashMapManager.requestCompleted(request);
-			}
+			this.flashMapManager.requestCompleted(request);
+			
 			// Restore the original attribute snapshot, in case of an include.
 			if (attributesSnapshot != null) {
 				restoreAttributesAfterInclude(request, attributesSnapshot);

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/FlashMap.java

@@ -20,98 +20,90 @@ import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
-import javax.servlet.http.HttpServletRequest;
-
 import org.springframework.beans.BeanUtils;
 import org.springframework.util.Assert;
-import org.springframework.util.StringUtils;
-import org.springframework.web.util.UrlPathHelper;
 
 /**
- * Stores attributes that need to be made available in the next request.
+ * A FlashMap provides a way for one request to store attributes intended for 
+ * use in another. This is most commonly needed when redirecting from one URL
+ * to another -- e.g. the Post/Redirect/Get pattern. A FlashMap is saved before 
+ * the redirect (typically in the session) and is made available after the 
+ * redirect and removed immediately.
+ * 
+ * <p>A FlashMap can be set up with a request path and request parameters to 
+ * help identify the target request. Without this information, a FlashMap is
+ * made available to the next request, which may or may not be the intended 
+ * result. Before a redirect, the target URL is known and when using the
+ * {@code org.springframework.web.servlet.view.RedirectView}, FlashMap 
+ * instances are automatically updated with redirect URL information.
+ * 
+ * <p>Annotated controllers will usually not access a FlashMap directly.. TODO
  * 
  * @author Rossen Stoyanchev
  * @since 3.1
+ * 
+ * @see FlashMapManager
  */
 public class FlashMap extends HashMap<String, Object> implements Comparable<FlashMap> {
 
 	private static final long serialVersionUID = 1L;
 	
-	private String expectedRequestUri;
+	private String targetRequestPath;
 	
-	private final Map<String, String> expectedRequestParameters = new LinkedHashMap<String, String>();
+	private final Map<String, String> targetRequestParams = new LinkedHashMap<String, String>();
 	
 	private long expirationStartTime;
 	
 	private int timeToLive;
 
-	private final UrlPathHelper urlPathHelper = new UrlPathHelper();
-	
+	private final int createdBy;
+
 	/**
-	 * Provide a URL to identify the target request for this FlashMap.
-	 * Only the path of the provided URL will be used for matching purposes. 
-	 * If the URL is absolute or has a query string, the URL path is 
-	 * extracted. Or if the URL is relative, it is appended to the current 
-	 * request URI and normalized.  
-	 *  
-	 * @param request the current request, used to normalize relative URLs
-	 * @param url an absolute URL, a URL path, or a relative URL, never {@code null}
+	 * Create a new instance.
 	 */
-	public FlashMap setExpectedRequestUri(HttpServletRequest request, String url) {
-		Assert.notNull(url, "Expected URL must not be null");
-		String path = extractRequestUri(url);
-		this.expectedRequestUri = path.startsWith("/") ? path : normalizeRelativePath(request, path);
-		return this;
+	public FlashMap() {
+		this.createdBy = 0;
 	}
 
-	private String extractRequestUri(String url) {
-		int index = url.indexOf("?");
-		if (index != -1) {
-			url = url.substring(0, index);
-		}
-		index = url.indexOf("://");
-		if (index != -1) {
-			int pathBegin = url.indexOf("/", index + 3);
-			url = (pathBegin != -1 ) ? url.substring(pathBegin) : "";
-		}
-		return url;
+	/**
+	 * Create a new instance with an id uniquely identifying the creator of 
+	 * this FlashMap.
+	 */
+	public FlashMap(int createdBy) {
+		this.createdBy = createdBy;
 	}
 
-	private String normalizeRelativePath(HttpServletRequest request, String relativeUrl) {
-		String requestUri = this.urlPathHelper.getRequestUri(request);
-		relativeUrl = requestUri.substring(0, requestUri.lastIndexOf('/') + 1) + relativeUrl;
-		return StringUtils.cleanPath(relativeUrl);
+	/**
+	 * Provide a URL path to help identify the target request for this FlashMap.
+	 * The path may be absolute (e.g. /application/resource) or relative to the
+	 * current request (e.g. ../resource).
+	 * @param path the URI path, never {@code null}
+	 */
+	public void setTargetRequestPath(String path) {
+		Assert.notNull(path, "Expected path must not be null");
+		this.targetRequestPath = path;
 	}
 
 	/**
-	 * Add a request parameter pair to help identify the request this FlashMap 
-	 * should be made available to. If expected parameters are not set, the 
-	 * FlashMap instance will match to requests with any parameters.
-	 * 
-	 * @param name the name of the expected parameter (never {@code null})
-	 * @param value the value for the expected parameter (never {@code null})
+	 * Return the URL path of the target request, or {@code null} if none.
 	 */
-	public FlashMap setExpectedRequestParam(String name, String value) {
-		this.expectedRequestParameters.put(name, value.toString());
-		return this;
+	public String getTargetRequestPath() {
+		return targetRequestPath;
 	}
 
 	/**
-	 * Provide request parameter pairs to help identify the request this FlashMap 
-	 * should be made available to. If expected parameters are not set, the 
-	 * FlashMap instance will match to requests with any parameters.
-	 * 
-	 * <p>Although the provided map contain any Object values, only non-"simple" 
-	 * value types as defined in {@link BeanUtils#isSimpleValueType} are used.
-	 * 
+	 * Provide request parameter pairs to identify the request for this FlashMap. 
+	 * If not set, the FlashMap will match to requests with any parameters.
+	 * Only simple value types, as defined in {@link BeanUtils#isSimpleValueType}, 
+	 * are used.
 	 * @param params a Map with the names and values of expected parameters.
 	 */
-	public FlashMap setExpectedRequestParams(Map<String, ?> params) {
+	public FlashMap addTargetRequestParams(Map<String, ?> params) {
 		if (params != null) {
 			for (String name : params.keySet()) {
 				Object value = params.get(name);
 				if ((value != null) && BeanUtils.isSimpleValueType(value.getClass())) {
-					this.expectedRequestParameters.put(name, value.toString());
+					this.targetRequestParams.put(name, value.toString());
 				}
 			}
 		}
@@ -119,37 +111,24 @@ public class FlashMap extends HashMap<String, Object> implements Comparable<Flas
 	}
 
 	/**
-	 * Whether this FlashMap matches to the given request by checking 
-	 * expectations provided via {@link #setExpectedRequestUri} and 
-	 * {@link #setExpectedRequestParams}.
+	 * Provide a request parameter to identify the request for this FlashMap.
+	 * If not set, the FlashMap will match to requests with any parameters.
 	 * 
-	 * @param request the current request
-	 * 
-	 * @return "true" if the expectations match or there are no expectations.
+	 * @param name the name of the expected parameter (never {@code null})
+	 * @param value the value for the expected parameter (never {@code null})
 	 */
-	public boolean matches(HttpServletRequest request) {
-		if (this.expectedRequestUri != null) {
-			String requestUri = this.urlPathHelper.getRequestUri(request);
-			if (!matchPathsIgnoreTrailingSlash(requestUri, this.expectedRequestUri)) {
-				return false;
-			}
-		}
-		if (this.expectedRequestParameters != null) {
-			for (Map.Entry<String, String> entry : this.expectedRequestParameters.entrySet()) {
-				if (!entry.getValue().equals(request.getParameter(entry.getKey()))) {
-					return false;
-				}
-			}
-		}
-		return true;
+	public FlashMap addTargetRequestParam(String name, String value) {
+		this.targetRequestParams.put(name, value.toString());
+		return this;
 	}
 	
-	private boolean matchPathsIgnoreTrailingSlash(String path1, String path2) {
-		path1 = path1.endsWith("/") ? path1.substring(0, path1.length() - 1) : path1;
-		path2 = path2.endsWith("/") ? path2.substring(0, path2.length() - 1) : path2;
-		return path1.equals(path2);
+	/**
+	 * Return the parameters identifying the target request, or an empty Map.
+	 */
+	public Map<String, String> getTargetRequestParams() {
+		return targetRequestParams;
 	}
-	
+
 	/**
 	 * Start the expiration period for this instance. After the given number of 
 	 * seconds calls to {@link #isExpired()} will return "true".
@@ -174,21 +153,24 @@ public class FlashMap extends HashMap<String, Object> implements Comparable<Flas
 	}
 
 	/**
-	 * Compare two FlashMap instances. One instance is preferred over the other
-	 * if it has an expected URL path or if it has a greater number of expected 
-	 * request parameters.
-	 * 
-	 * <p>It is expected that both instances have been matched against the 
-	 * current request via {@link FlashMap#matches}.
+	 * Whether the given id matches the id of the creator of this FlashMap.
+	 */
+	public boolean isCreatedBy(int createdBy) {
+		return this.createdBy == createdBy;
+	}
+
+	/**
+	 * Compare two FlashMaps and select the one that has a target URL path or 
+	 * has more target request parameters. 
 	 */
 	public int compareTo(FlashMap other) {
-		int thisUrlPath = (this.expectedRequestUri != null) ? 1 : 0;
-		int otherUrlPath = (other.expectedRequestUri != null) ? 1 : 0;
+		int thisUrlPath = (this.targetRequestPath != null) ? 1 : 0;
+		int otherUrlPath = (other.targetRequestPath != null) ? 1 : 0;
 		if (thisUrlPath != otherUrlPath) {
 			return otherUrlPath - thisUrlPath;
 		}
 		else {
-			return other.expectedRequestParameters.size() - this.expectedRequestParameters.size();
+			return other.targetRequestParams.size() - this.targetRequestParams.size();
 		}
 	}
 
@@ -196,8 +178,8 @@ public class FlashMap extends HashMap<String, Object> implements Comparable<Flas
 	public String toString() {
 		StringBuilder result = new StringBuilder();
 		result.append("[Attributes=").append(super.toString());
-		result.append(", expecteRequestUri=").append(this.expectedRequestUri);
-		result.append(", expectedRequestParameters=" + this.expectedRequestParameters.toString()).append("]");
+		result.append(", expecteRequestUri=").append(this.targetRequestPath);
+		result.append(", expectedRequestParameters=" + this.targetRequestParams.toString()).append("]");
 		return result.toString();
 	}
 

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/FlashMapManager.java

@@ -16,18 +16,20 @@
 
 package org.springframework.web.servlet;
 
-import javax.servlet.http.HttpServletRequest;
+import java.util.Map;
 
-import org.springframework.web.servlet.support.RequestContextUtils;
+import javax.servlet.http.HttpServletRequest;
 
 /**
- * A strategy interface for maintaining {@link FlashMap} instances in some 
- * underlying storage until the next request. 
+ * A strategy interface for storing and retrieving {@code FlashMap} instances.
+ * See {@link FlashMap} for a general overview of using flash attributes.
  * 
- * <p>The most common use case for using flash storage is a redirect. 
- * For example creating a resource in a POST request and then redirecting
- * to the page that shows the resource. Flash storage may be used to 
- * pass along a success message.
+ * <p>A FlashMapManager is invoked at the beginning and at the end of a request.
+ * For each request, it exposes an "input" FlashMap with attributes passed from
+ * a previous request (if any) and an "output" FlashMap with attributes to pass 
+ * to a subsequent request. Both FlashMap instances are exposed via request
+ * attributes and can be accessed through methods in
+ * {@code org.springframework.web.servlet.support.RequestContextUtils}.
  * 
  * @author Rossen Stoyanchev
  * @since 3.1
@@ -37,41 +39,42 @@ import org.springframework.web.servlet.support.RequestContextUtils;
 public interface FlashMapManager {
 
 	/**
-	 * Request attribute holding the read-only Map with flash attributes saved 
-	 * during the previous request.
-	 * @see RequestContextUtils#getInputFlashMap(HttpServletRequest)
+	 * Name of request attribute that holds a read-only {@link Map} with 
+	 * "input" flash attributes from a previous request (if any).
+	 * @see org.springframework.web.servlet.support.RequestContextUtils#getInputFlashMap(HttpServletRequest)
 	 */
 	public static final String INPUT_FLASH_MAP_ATTRIBUTE = FlashMapManager.class.getName() + ".INPUT_FLASH_MAP";
 
 	/**
-	 * Request attribute holding the {@link FlashMap} to add attributes to during 
-	 * the current request.
-	 * @see RequestContextUtils#getOutputFlashMap(HttpServletRequest)
+	 * Name of request attribute that holds the "output" {@link FlashMap} with
+	 * attributes to pass to a subsequent request.
+	 * @see org.springframework.web.servlet.support.RequestContextUtils#getOutputFlashMap(HttpServletRequest)
 	 */
 	public static final String OUTPUT_FLASH_MAP_ATTRIBUTE = FlashMapManager.class.getName() + ".OUTPUT_FLASH_MAP";
 
 	/**
-	 * Perform flash storage tasks at the start of a new request:
-	 * <ul>
-	 * 	<li>Create a FlashMap and make it available under the request attribute 
-	 * 	{@link #OUTPUT_FLASH_MAP_ATTRIBUTE}.
-	 * 	<li>Locate the FlashMap saved during the previous request and make it
-	 * 	available under the request attribute {@link #INPUT_FLASH_MAP_ATTRIBUTE}.
+	 * Performs the following tasks unless the {@link #OUTPUT_FLASH_MAP_ATTRIBUTE} 
+	 * request attribute exists:
+	 * <ol>
+	 * 	<li>Find the "input" FlashMap from a previous request (if any), expose it 
+	 * under the request attribute {@link #INPUT_FLASH_MAP_ATTRIBUTE}, and 
+	 * remove it from underlying storage.
+	 * 	<li>Create the "output" FlashMap where the current request can save 
+	 * flash attributes and expose it under the request attribute 
+	 * {@link #OUTPUT_FLASH_MAP_ATTRIBUTE}.
 	 * 	<li>Remove expired FlashMap instances.
-	 * </ul>
-	 * <p>If the {@link #OUTPUT_FLASH_MAP_ATTRIBUTE} request attribute exists
-	 * return "false" immediately.
+	 * </ol>
 	 * 
 	 * @param request the current request
-	 * @return "true" if flash storage tasks were performed; "false" otherwise.
 	 */
-	boolean requestStarted(HttpServletRequest request);
+	void requestStarted(HttpServletRequest request);
 
 	/**
-	 * Access the FlashMap with attributes added during the current request and
-	 * if it is not empty, save it in the underlying storage. 
-	 * <p>If the call to {@link #requestStarted} returned "false", this 
-	 * method is not invoked.
+	 * Save the "output" FlashMap in underlying storage, start its expiration 
+	 * period, and decode/normalize its target request path. 
+	 * 
+	 * <p>The "output" FlashMap is not saved if it is empty or if it was not 
+	 * created by this FlashMapManager.
 	 */
 	void requestCompleted(HttpServletRequest request);
 

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/condition/ParamsRequestCondition.java

@@ -54,8 +54,8 @@ public final class ParamsRequestCondition extends AbstractRequestCondition<Param
 	private static Collection<ParamExpression> parseExpressions(String... params) {
 		Set<ParamExpression> expressions = new LinkedHashSet<ParamExpression>();
 		if (params != null) {
-			for (String header : params) {
-				expressions.add(new ParamExpression(header));
+			for (String param : params) {
+				expressions.add(new ParamExpression(param));
 			}
 		}
 		return expressions;

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/support/DefaultFlashMapManager.java

@@ -28,12 +28,13 @@ import javax.servlet.http.HttpSession;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.springframework.util.CollectionUtils;
+import org.springframework.util.StringUtils;
 import org.springframework.web.servlet.FlashMap;
 import org.springframework.web.servlet.FlashMapManager;
+import org.springframework.web.util.UrlPathHelper;
 
 /**
- * A {@link FlashMapManager} that saves and retrieves FlashMap instances in the 
- * HTTP session.
+ * A {@link FlashMapManager} that stores FlashMap instances in the HTTP session.
  * 
  * @author Rossen Stoyanchev
  * @since 3.1
@@ -46,10 +47,11 @@ public class DefaultFlashMapManager implements FlashMapManager {
 	
 	private int flashTimeout = 180;
 
+	private final UrlPathHelper urlPathHelper = new UrlPathHelper();
+
 	/**
-	 * The amount of time in seconds after a request has completed processing 
-	 * and before a FlashMap is considered expired.
-	 * The default value is 180.
+	 * The amount of time in seconds after a FlashMap is saved (after request
+	 * completion) before it is considered expired. The default value is 180.
 	 */
 	public void setFlashMapTimeout(int flashTimeout) {
 		this.flashTimeout = flashTimeout;
@@ -57,126 +59,153 @@ public class DefaultFlashMapManager implements FlashMapManager {
 
 	/**
 	 * {@inheritDoc}
-	 * 
-	 * <p>This method never creates an HTTP session. The new FlashMap created 
-	 * for the current request is exposed as a request attribute only and is 
-	 * not saved in the session until {@link #requestCompleted} is called.
+	 * <p>This method never causes the HTTP session to be created.
 	 */
-	public boolean requestStarted(HttpServletRequest request) {
+	public void requestStarted(HttpServletRequest request) {
 		if (request.getAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE) != null) {
-			return false;
+			return;
 		}
-
-		FlashMap outputFlashMap = new FlashMap();
-		request.setAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE, outputFlashMap);
 		
-		Map<String, ?> inputFlashMap = getFlashMap(request);
+		Map<String, ?> inputFlashMap = lookupFlashMap(request);
 		if (inputFlashMap != null) {
 			request.setAttribute(INPUT_FLASH_MAP_ATTRIBUTE, inputFlashMap);
 		}
-		
+
+		FlashMap outputFlashMap = new FlashMap(this.hashCode());
+		request.setAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE, outputFlashMap);
+
 		removeExpiredFlashMaps(request);
-		
-		return true;
 	}
 
 	/**
-	 * Return the flash attributes saved during the previous request if any.
-	 * 
-	 * @return a read-only Map; or {@code null} if not found.
+	 * Look up the "input" FlashMap by matching the target request path and 
+	 * the target request parameters configured in each available FlashMap
+	 * to the current request.
 	 */
-	private Map<String, ?> getFlashMap(HttpServletRequest request) {
-		List<FlashMap> allMaps = retrieveFlashMaps(request, false);
-		if (CollectionUtils.isEmpty(allMaps)) {
+	private Map<String, ?> lookupFlashMap(HttpServletRequest request) {
+		List<FlashMap> allFlashMaps = retrieveFlashMaps(request, false);
+		if (CollectionUtils.isEmpty(allFlashMaps)) {
 			return null;
 		}
-		
 		if (logger.isDebugEnabled()) {
-			logger.debug("Looking up previous FlashMap among available FlashMaps: " + allMaps);
+			logger.debug("Retrieved flash maps: " + allFlashMaps);
 		}
-		
-		List<FlashMap> matches = new ArrayList<FlashMap>();
-		for (FlashMap flashMap : allMaps) {
-			if (flashMap.matches(request)) {
-				if (logger.isDebugEnabled()) {
-					logger.debug("Matched " + flashMap);
-				}
-				matches.add(flashMap);
+		List<FlashMap> result = new ArrayList<FlashMap>();
+		for (FlashMap flashMap : allFlashMaps) {
+			if (isFlashMapForRequest(flashMap, request)) {
+				result.add(flashMap);
 			}
 		}
-		
-		if (!matches.isEmpty()) {
-			Collections.sort(matches);
-			FlashMap match = matches.remove(0);
-			allMaps.remove(match);
+		if (!result.isEmpty()) {
+			Collections.sort(result);
+			if (logger.isDebugEnabled()) {
+				logger.debug("Matching flash maps: " + result);
+			}
+			FlashMap match = result.remove(0);
+			allFlashMaps.remove(match);
 			return Collections.unmodifiableMap(match);
 		}
-		
 		return null;
 	}
 
 	/**
-	 * Retrieve the list of all FlashMap instances from the HTTP session. 
+	 * Compares the target request path and the target request parameters in the
+	 * given FlashMap and returns "true" if they match. If the FlashMap does not
+	 * have target request information, it matches any request.
+	 */
+	protected boolean isFlashMapForRequest(FlashMap flashMap, HttpServletRequest request) {
+		if (flashMap.getTargetRequestPath() != null) {
+			String requestUri = this.urlPathHelper.getRequestUri(request);
+			if (!requestUri.equals(flashMap.getTargetRequestPath())
+					&& !requestUri.equals(flashMap.getTargetRequestPath() + "/")) {
+				return false;
+			}
+		}
+		if (flashMap.getTargetRequestParams() != null) {
+			for (Map.Entry<String, String> entry : flashMap.getTargetRequestParams().entrySet()) {
+				if (!entry.getValue().equals(request.getParameter(entry.getKey()))) {
+					return false;
+				}
+			}
+		}
+		return true;
+	}
+
+	/**
+	 * Retrieve all available FlashMap instances from the HTTP session. 
 	 * @param request the current request
-	 * @param allowCreate whether to create and the FlashMap container if not found
-	 * @return a Map with all stored FlashMap instances; or {@code null}
+	 * @param allowCreate whether to create and save the FlashMap in the session
+	 * @return a Map with all FlashMap instances; or {@code null}
 	 */
 	@SuppressWarnings("unchecked")
-	private List<FlashMap> retrieveFlashMaps(HttpServletRequest request, boolean allowCreate) {
+	protected List<FlashMap> retrieveFlashMaps(HttpServletRequest request, boolean allowCreate) {
 		HttpSession session = request.getSession(allowCreate);
 		if (session == null) {
 			return null;
-		} 
-		
-		List<FlashMap> allMaps = (List<FlashMap>) session.getAttribute(FLASH_MAPS_SESSION_ATTRIBUTE);
-		if (allMaps == null && allowCreate) {
-			synchronized (DefaultFlashMapManager.class) {
-				allMaps = (List<FlashMap>) session.getAttribute(FLASH_MAPS_SESSION_ATTRIBUTE);
-				if (allMaps == null) {
-					allMaps = new CopyOnWriteArrayList<FlashMap>();
-					session.setAttribute(FLASH_MAPS_SESSION_ATTRIBUTE, allMaps);
+		}
+		List<FlashMap> allFlashMaps = (List<FlashMap>) session.getAttribute(FLASH_MAPS_SESSION_ATTRIBUTE);
+		if (allFlashMaps == null && allowCreate) {
+			synchronized (this) {
+				allFlashMaps = (List<FlashMap>) session.getAttribute(FLASH_MAPS_SESSION_ATTRIBUTE);
+				if (allFlashMaps == null) {
+					allFlashMaps = new CopyOnWriteArrayList<FlashMap>();
+					session.setAttribute(FLASH_MAPS_SESSION_ATTRIBUTE, allFlashMaps);
 				}
 			}
 		}
-		
-		return allMaps;
+		return allFlashMaps;
 	}
-
+	
+	/**
+	 * Iterate available FlashMap instances and remove the ones that have expired.
+	 */
 	private void removeExpiredFlashMaps(HttpServletRequest request) {
 		List<FlashMap> allMaps = retrieveFlashMaps(request, false);
-		if (allMaps != null && !allMaps.isEmpty()) {
-			List<FlashMap> expiredMaps = new ArrayList<FlashMap>();
-			for (FlashMap flashMap : allMaps) {
-				if (flashMap.isExpired()) {
-					if (logger.isDebugEnabled()) {
-						logger.debug("Removing expired FlashMap: " + flashMap);
-					}
-					expiredMaps.add(flashMap);
+		if (CollectionUtils.isEmpty(allMaps)) {
+			return;
+		}
+		List<FlashMap> expiredMaps = new ArrayList<FlashMap>();
+		for (FlashMap flashMap : allMaps) {
+			if (flashMap.isExpired()) {
+				if (logger.isDebugEnabled()) {
+					logger.debug("Removing expired FlashMap: " + flashMap);
 				}
+				expiredMaps.add(flashMap);
 			}
-			allMaps.removeAll(expiredMaps);
 		}
+		allMaps.removeAll(expiredMaps);
 	}
 	
-	/**
-	 * {@inheritDoc}
-	 * 
-	 * <p>The HTTP session is not created if the current FlashMap instance is empty.
-	 */
 	public void requestCompleted(HttpServletRequest request) {
 		FlashMap flashMap = (FlashMap) request.getAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE);
 		if (flashMap == null) {
 			throw new IllegalStateException(
 					"Did not find a FlashMap exposed as the request attribute " + OUTPUT_FLASH_MAP_ATTRIBUTE);
 		}
-		
-		if (!flashMap.isEmpty()) {
+		if (!flashMap.isEmpty() && flashMap.isCreatedBy(this.hashCode())) {
 			if (logger.isDebugEnabled()) {
 				logger.debug("Saving FlashMap=" + flashMap);
 			}
-			List<FlashMap> allFlashMaps = retrieveFlashMaps(request, true);
+			decodeAndNormalizeTargetPath(flashMap, request);
 			flashMap.startExpirationPeriod(this.flashTimeout);
-			allFlashMaps.add(flashMap);
+			retrieveFlashMaps(request, true).add(flashMap);
+		}
+	}
+
+	/**
+	 * Ensure the target request path in the given FlashMap is decoded and also 
+	 * normalized (if it is relative) against the current request URL. 
+	 */
+	private void decodeAndNormalizeTargetPath(FlashMap flashMap, HttpServletRequest request) {
+		String path = flashMap.getTargetRequestPath();
+		if (path != null) {
+			path = urlPathHelper.decodeRequestString(request, path);
+			if (path.charAt(0) != '/') {
+				String requestUri = this.urlPathHelper.getRequestUri(request);
+				path = requestUri.substring(0, requestUri.lastIndexOf('/') + 1) + path;
+				path = StringUtils.cleanPath(path);
+			}
+			flashMap.setTargetRequestPath(path);
 		}
 	}
 

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/view/RedirectView.java

@@ -38,6 +38,7 @@ import org.springframework.beans.BeanUtils;
 import org.springframework.http.HttpStatus;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
 import org.springframework.web.servlet.FlashMap;
 import org.springframework.web.servlet.HandlerMapping;
 import org.springframework.web.servlet.SmartView;
@@ -261,24 +262,27 @@ public class RedirectView extends AbstractUrlBasedView implements SmartView {
 			enc = WebUtils.DEFAULT_CHARACTER_ENCODING;
 		}
 
-		UriTemplate uriTemplate = createUriTemplate(targetUrl, enc);
-		if (uriTemplate.getVariableNames().size() > 0) {
-			Map<String, Object> vars = new HashMap<String, Object>();
-			vars.putAll(getCurrentUriVars(request));
-			vars.putAll(model);
-			targetUrl = new StringBuilder(uriTemplate.expand(vars).toString());
-			model = removeKeys(model, uriTemplate.getVariableNames());
+		if (StringUtils.hasText(targetUrl)) {
+			UriTemplate uriTemplate = createUriTemplate(targetUrl, enc);
+			if (uriTemplate.getVariableNames().size() > 0) {
+				Map<String, Object> vars = new HashMap<String, Object>();
+				vars.putAll(getCurrentUriVars(request));
+				vars.putAll(model);
+				targetUrl = new StringBuilder(uriTemplate.expand(vars).toString());
+				model = removeKeys(model, uriTemplate.getVariableNames());
+			}
 		}
-
+		
 		FlashMap flashMap = RequestContextUtils.getOutputFlashMap(request);
 		if (!CollectionUtils.isEmpty(flashMap)) {
-			flashMap.setExpectedRequestUri(request, targetUrl.toString());
+			String targetPath = WebUtils.extractUrlPath(targetUrl.toString());
+			flashMap.setTargetRequestPath(targetPath);
 		}
 
 		if (this.exposeModelAttributes) {
 			appendQueryProperties(targetUrl, model, enc);
 			if (!CollectionUtils.isEmpty(flashMap)) {
-				flashMap.setExpectedRequestParams(model);
+				flashMap.addTargetRequestParams(model);
 			}
 		}
 

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/FlashMapTests.java

@@ -21,7 +21,6 @@ import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 import org.junit.Test;
-import org.springframework.mock.web.MockHttpServletRequest;
 
 /**
  * Test fixture for {@link FlashMap} tests.
@@ -30,101 +29,6 @@ import org.springframework.mock.web.MockHttpServletRequest;
  */
 public class FlashMapTests {
 
-	@Test
-	public void matchAnyUrlPath() {
-		FlashMap flashMap = new FlashMap();
-
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "")));
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/")));
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes")));
-	}
-
-	@Test
-	public void matchUrlPath() {
-		FlashMap flashMap = new FlashMap();
-		flashMap.setExpectedRequestUri(null, "/yes");
-
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes")));
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes/")));
-		assertFalse(flashMap.matches(new MockHttpServletRequest("GET", "/yes/but")));
-		assertFalse(flashMap.matches(new MockHttpServletRequest("GET", "/no")));
-
-		flashMap.setExpectedRequestUri(null, "/thats it?");
-
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/thats it")));
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/thats%20it")));
-	}
-
-	@Test
-	public void matchRelativeUrlPath() {
-		FlashMap flashMap = new FlashMap();
-
-		flashMap.setExpectedRequestUri(new MockHttpServletRequest("GET", "/oh/no"), "yes");
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/oh/yes")));
-
-		flashMap.setExpectedRequestUri(new MockHttpServletRequest("GET", "/oh/not/again"), "../ok");
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/oh/ok")));
-
-		flashMap.setExpectedRequestUri(new MockHttpServletRequest("GET", "/yes/it/is"), "..");
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes")));
-
-		flashMap.setExpectedRequestUri(new MockHttpServletRequest("GET", "/yes/it/is"), "../");
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes")));
-
-		flashMap.setExpectedRequestUri(new MockHttpServletRequest("GET", "/thats it/really"), "./");
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/thats%20it")));
-		
-		flashMap.setExpectedRequestUri(new MockHttpServletRequest("GET", "/yes/it/is"), "..?url=http://example.com");
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes")));
-	}
-
-	@Test
-	public void matchAbsoluteUrlPath() {
-		FlashMap flashMap = new FlashMap();
-		flashMap.setExpectedRequestUri(new MockHttpServletRequest(), "http://example.com");
-
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "")));
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/")));
-		assertFalse(flashMap.matches(new MockHttpServletRequest("GET", "/no")));
-
-		flashMap.setExpectedRequestUri(null, "http://example.com/");
-
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "")));
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/")));
-		assertFalse(flashMap.matches(new MockHttpServletRequest("GET", "/no")));
-
-		flashMap.setExpectedRequestUri(null, "http://example.com/yes");
-
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes")));
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes/")));
-		assertFalse(flashMap.matches(new MockHttpServletRequest("GET", "/no")));
-		assertFalse(flashMap.matches(new MockHttpServletRequest("GET", "/yes/no")));
-
-		flashMap.setExpectedRequestUri(null, "http://example.com/yes?a=1");
-
-		assertTrue(flashMap.matches(new MockHttpServletRequest("GET", "/yes")));
-	}
-
-	@Test
-	public void matchExpectedRequestParameter() {
-		String parameterName = "numero";
-
-		FlashMap flashMap = new FlashMap();
-		flashMap.setExpectedRequestParam(parameterName, "uno");
-
-		MockHttpServletRequest request = new MockHttpServletRequest();
-		assertFalse(flashMap.matches(request));
-
-		request.setParameter(parameterName, "uno");
-		assertTrue(flashMap.matches(request));
-
-		request.setParameter(parameterName, "dos");
-		assertFalse(flashMap.matches(request));
-
-		request.setParameter(parameterName, (String) null);
-		assertFalse(flashMap.matches(request));
-	}
-
 	@Test
 	public void isExpired() throws InterruptedException {
 		FlashMap flashMap = new FlashMap();
@@ -152,18 +56,18 @@ public class FlashMapTests {
 		FlashMap flashMap2 = new FlashMap();
 		assertEquals(0, flashMap1.compareTo(flashMap2));
 
-		flashMap1.setExpectedRequestUri(null, "/path1");
+		flashMap1.setTargetRequestPath("/path1");
 		assertEquals(-1, flashMap1.compareTo(flashMap2));
 		assertEquals(1, flashMap2.compareTo(flashMap1));
 
-		flashMap2.setExpectedRequestUri(null, "/path2");
+		flashMap2.setTargetRequestPath("/path2");
 		assertEquals(0, flashMap1.compareTo(flashMap2));
 
-		flashMap1.setExpectedRequestParam("id", "1");
+		flashMap1.addTargetRequestParam("id", "1");
 		assertEquals(-1, flashMap1.compareTo(flashMap2));
 		assertEquals(1, flashMap2.compareTo(flashMap1));
 
-		flashMap2.setExpectedRequestParam("id", "2");
+		flashMap2.addTargetRequestParam("id", "2");
 		assertEquals(0, flashMap1.compareTo(flashMap2));
 	}
 

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/support/DefaultFlashMapManagerTests.java

@@ -16,12 +16,14 @@
 
 package org.springframework.web.servlet.support;
 
+
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
+import static org.springframework.web.servlet.FlashMapManager.INPUT_FLASH_MAP_ATTRIBUTE;
+import static org.springframework.web.servlet.FlashMapManager.OUTPUT_FLASH_MAP_ATTRIBUTE;
 
 import java.util.Collections;
 import java.util.List;
@@ -51,55 +53,111 @@ public class DefaultFlashMapManagerTests {
 	
 	@Test
 	public void requestStarted() {
-		boolean initialized = this.flashMapManager.requestStarted(this.request);
+		this.flashMapManager.requestStarted(this.request);
+		FlashMap flashMap = RequestContextUtils.getOutputFlashMap(request);
+		
+		assertNotNull("Current FlashMap not found", flashMap);
+	}
 
-		assertTrue("Current FlashMap not initialized on first call", initialized);
-		assertNotNull("Current FlashMap not found", RequestContextUtils.getOutputFlashMap(request));
+	@Test
+	public void requestStartedAlready() {
+		FlashMap flashMap = new FlashMap();
+		this.request.setAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE, flashMap);
+		this.flashMapManager.requestStarted(this.request);
 		
-		initialized = this.flashMapManager.requestStarted(this.request);
+		assertSame(flashMap, RequestContextUtils.getOutputFlashMap(request));
+	}
+	
+	@Test
+	public void lookupFlashMapByPath() {
+		FlashMap flashMap = new FlashMap();
+		flashMap.put("key", "value");
+		flashMap.setTargetRequestPath("/path");
 		
-		assertFalse("Current FlashMap initialized twice", initialized);
+		List<FlashMap> allMaps = createFlashMaps();
+		allMaps.add(flashMap);
+	
+		this.request.setRequestURI("/path");
+		this.flashMapManager.requestStarted(this.request);
+		
+		assertEquals(flashMap, RequestContextUtils.getInputFlashMap(this.request));
+		assertEquals("Input FlashMap should have been removed", 0, getFlashMaps().size());		
 	}
-
+	
 	@Test
-	public void lookupInputFlashMap() {
+	public void lookupFlashMapByPathWithTrailingSlash() {
 		FlashMap flashMap = new FlashMap();
 		flashMap.put("key", "value");
+		flashMap.setTargetRequestPath("/path");
+		
+		List<FlashMap> allMaps = createFlashMaps();
+		allMaps.add(flashMap);
+	
+		this.request.setRequestURI("/path/");
+		this.flashMapManager.requestStarted(this.request);
+		
+		assertEquals(flashMap, RequestContextUtils.getInputFlashMap(this.request));
+		assertEquals("Input FlashMap should have been removed", 0, getFlashMaps().size());		
+	}
 
-		List<FlashMap> allMaps = createFlashMapsSessionAttribute();
+	@Test
+	public void lookupFlashMapWithParams() {
+		FlashMap flashMap = new FlashMap();
+		flashMap.put("key", "value");
+		flashMap.addTargetRequestParam("number", "one");
+		
+		List<FlashMap> allMaps = createFlashMaps();
 		allMaps.add(flashMap);
+	
+		this.request.setParameter("number", (String) null);
+		this.flashMapManager.requestStarted(this.request);
+
+		assertNull(RequestContextUtils.getInputFlashMap(this.request));
+		assertEquals("FlashMap should have been removed", 1, getFlashMaps().size());		
 
+		clearRequestAttributes();
+		this.request.setParameter("number", "two");
 		this.flashMapManager.requestStarted(this.request);
-		
-		assertEquals(flashMap, request.getAttribute(DefaultFlashMapManager.INPUT_FLASH_MAP_ATTRIBUTE));
-		assertEquals("Input FlashMap should have been removed", 0, allMaps.size());
+
+		assertNull(RequestContextUtils.getInputFlashMap(this.request));
+		assertEquals("FlashMap should have been removed", 1, getFlashMaps().size());		
+
+		clearRequestAttributes();
+		this.request.setParameter("number", "one");
+		this.flashMapManager.requestStarted(this.request);
+
+		assertEquals(flashMap, RequestContextUtils.getInputFlashMap(this.request));
+		assertEquals("Input FlashMap should have been removed", 0, getFlashMaps().size());		
 	}
 	
 	@Test
-	public void lookupInputFlashMapExpectedUrlPath() {
+	public void lookupFlashMapSortOrder() {
 		FlashMap emptyFlashMap = new FlashMap();
 
-		FlashMap oneFlashMap = new FlashMap();
-		oneFlashMap.setExpectedRequestUri(null, "/one");
+		FlashMap flashMapOne = new FlashMap();
+		flashMapOne.put("key1", "value1");
+		flashMapOne.setTargetRequestPath("/one");
 
-		FlashMap secondFlashMap = new FlashMap();
-		secondFlashMap.setExpectedRequestUri(null, "/one/two");
+		FlashMap flashMapTwo = new FlashMap();
+		flashMapTwo.put("key1", "value1");
+		flashMapTwo.put("key2", "value2");
+		flashMapTwo.setTargetRequestPath("/one/two");
 		
-		List<FlashMap> allMaps = createFlashMapsSessionAttribute();
+		List<FlashMap> allMaps = createFlashMaps();
 		allMaps.add(emptyFlashMap);
-		allMaps.add(oneFlashMap);
-		allMaps.add(secondFlashMap);
+		allMaps.add(flashMapOne);
+		allMaps.add(flashMapTwo);
 		Collections.shuffle(allMaps);
 
-		this.request.setRequestURI("/one");
+		this.request.setRequestURI("/one/two");
 		this.flashMapManager.requestStarted(this.request);
 		
-		assertEquals(oneFlashMap, request.getAttribute(DefaultFlashMapManager.INPUT_FLASH_MAP_ATTRIBUTE));
+		assertEquals(flashMapTwo, request.getAttribute(INPUT_FLASH_MAP_ATTRIBUTE));
 	}
 
 	@Test
 	public void removeExpiredFlashMaps() throws InterruptedException {
-		List<FlashMap> allMaps = createFlashMapsSessionAttribute();
+		List<FlashMap> allMaps = createFlashMaps();
 		for (int i=0; i < 5; i++) {
 			FlashMap flashMap = new FlashMap();
 			allMaps.add(flashMap);
@@ -114,17 +172,34 @@ public class DefaultFlashMapManagerTests {
 	}
 
 	@Test
-	public void saveFlashMap() throws InterruptedException {
+	public void saveFlashMapWithoutAttributes() throws InterruptedException {
+		this.flashMapManager.requestStarted(this.request);
+		this.flashMapManager.requestCompleted(this.request);
+
+		assertNull(getFlashMaps());
+	}
+
+	@Test
+	public void saveFlashMapNotCreatedByThisManager() throws InterruptedException {
 		FlashMap flashMap = new FlashMap();
+		this.request.setAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE, flashMap);
+		this.flashMapManager.requestCompleted(this.request);
+
+		assertNull(getFlashMaps());
+	}
+	
+	@Test
+	public void saveFlashMapWithAttributes() throws InterruptedException {
+		this.flashMapManager.requestStarted(this.request);
+		FlashMap flashMap = RequestContextUtils.getOutputFlashMap(this.request);
 		flashMap.put("name", "value");
-		request.setAttribute(DefaultFlashMapManager.OUTPUT_FLASH_MAP_ATTRIBUTE, flashMap);
 
 		this.flashMapManager.setFlashMapTimeout(0);
 		this.flashMapManager.requestCompleted(this.request);
 
 		Thread.sleep(1);
 		
-		List<FlashMap> allMaps = getFlashMapsSessionAttribute();
+		List<FlashMap> allMaps = getFlashMaps();
 		
 		assertNotNull(allMaps);
 		assertSame(flashMap, allMaps.get(0));
@@ -132,22 +207,68 @@ public class DefaultFlashMapManagerTests {
 	}
 
 	@Test
-	public void saveFlashMapIsEmpty() throws InterruptedException {
-		request.setAttribute(DefaultFlashMapManager.OUTPUT_FLASH_MAP_ATTRIBUTE, new FlashMap());
+	public void decodeTargetPath() throws InterruptedException {
+		this.flashMapManager.requestStarted(this.request);
+		FlashMap flashMap = RequestContextUtils.getOutputFlashMap(this.request);
+		flashMap.put("key", "value");
+
+		flashMap.setTargetRequestPath("/once%20upon%20a%20time");
+		this.flashMapManager.requestCompleted(this.request);
+		
+		assertEquals("/once upon a time", flashMap.getTargetRequestPath());
+	}
+
+	@Test
+	public void normalizeTargetPath() throws InterruptedException {
+		this.flashMapManager.requestStarted(this.request);
+		FlashMap flashMap = RequestContextUtils.getOutputFlashMap(this.request);
+		flashMap.put("key", "value");
+
+		flashMap.setTargetRequestPath(".");
+		this.request.setRequestURI("/once/upon/a/time");
+		this.flashMapManager.requestCompleted(this.request);
+
+		assertEquals("/once/upon/a", flashMap.getTargetRequestPath());
+
+		flashMap.setTargetRequestPath("./");
+		this.request.setRequestURI("/once/upon/a/time");
+		this.flashMapManager.requestCompleted(this.request);
+
+		assertEquals("/once/upon/a/", flashMap.getTargetRequestPath());
+
+		flashMap.setTargetRequestPath("..");
+		this.request.setRequestURI("/once/upon/a/time");
 		this.flashMapManager.requestCompleted(this.request);
 
-		assertNull(getFlashMapsSessionAttribute());
+		assertEquals("/once/upon", flashMap.getTargetRequestPath());
+
+		flashMap.setTargetRequestPath("../");
+		this.request.setRequestURI("/once/upon/a/time");
+		this.flashMapManager.requestCompleted(this.request);
+
+		assertEquals("/once/upon/", flashMap.getTargetRequestPath());
+
+		flashMap.setTargetRequestPath("../../only");
+		this.request.setRequestURI("/once/upon/a/time");
+		this.flashMapManager.requestCompleted(this.request);
+
+		assertEquals("/once/only", flashMap.getTargetRequestPath());
 	}
 
 	@SuppressWarnings("unchecked")
-	private List<FlashMap> getFlashMapsSessionAttribute() {
+	private List<FlashMap> getFlashMaps() {
 		return (List<FlashMap>) this.request.getSession().getAttribute(DefaultFlashMapManager.class + ".FLASH_MAPS");
 	}
 
-	private List<FlashMap> createFlashMapsSessionAttribute() {
+	private List<FlashMap> createFlashMaps() {
 		List<FlashMap> allMaps = new CopyOnWriteArrayList<FlashMap>();
 		this.request.getSession().setAttribute(DefaultFlashMapManager.class + ".FLASH_MAPS", allMaps);
 		return allMaps;
 	}
+	
+	private void clearRequestAttributes() {
+		request.removeAttribute(INPUT_FLASH_MAP_ATTRIBUTE);
+		request.removeAttribute(OUTPUT_FLASH_MAP_ATTRIBUTE);
+	}
 
 }

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/view/RedirectViewTests.java

@@ -16,18 +16,25 @@
 
 package org.springframework.web.servlet.view;
 
+import static org.easymock.EasyMock.createMock;
+import static org.easymock.EasyMock.createNiceMock;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.replay;
+import static org.easymock.EasyMock.verify;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 import junit.framework.AssertionFailedError;
-import static org.easymock.EasyMock.*;
-import static org.junit.Assert.*;
-import org.junit.Test;
 
+import org.junit.Test;
 import org.springframework.beans.TestBean;
 import org.springframework.http.HttpStatus;
 import org.springframework.mock.web.MockHttpServletRequest;
@@ -116,13 +123,13 @@ public class RedirectViewTests {
 		FlashMap flashMap = new FlashMap();
 		flashMap.put("successMessage", "yay!");
 		request.setAttribute(FlashMapManager.OUTPUT_FLASH_MAP_ATTRIBUTE, flashMap);
-		rv.render(new ModelMap("id", "1"), request, response);
+		ModelMap model = new ModelMap("id", "1");
+		rv.render(model, request, response);
 		assertEquals(303, response.getStatus());
 		assertEquals("http://url.somewhere.com/path?id=1", response.getHeader("Location"));
 		
-		MockHttpServletRequest nextRequest = new MockHttpServletRequest("GET", "/path");
-		nextRequest.addParameter("id", "1");
-		assertTrue(flashMap.matches(nextRequest));
+		assertEquals("/path", flashMap.getTargetRequestPath());
+		assertEquals(model, flashMap.getTargetRequestParams());
 	}
 
 	@Test

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/view/RedirectViewUriTemplateTests.java

@@ -94,4 +94,14 @@ public class RedirectViewUriTemplateTests {
 		assertEquals(url + "/value1/v1/value2?key3=value3", response.getRedirectedUrl());
 	}
 
+	@Test
+	public void emptyRedirectString() throws Exception {
+		Map<String, Object> model = new HashMap<String, Object>();
+
+		RedirectView redirectView = new RedirectView("");
+		redirectView.renderMergedOutputModel(model, request, response);
+
+		assertEquals("", response.getRedirectedUrl());
+	}
+	
 }

org.springframework.web/src/main/java/org/springframework/web/util/WebUtils.java

@@ -21,6 +21,7 @@ import java.io.FileNotFoundException;
 import java.util.Enumeration;
 import java.util.Map;
 import java.util.TreeMap;
+
 import javax.servlet.ServletContext;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletRequestWrapper;
@@ -723,4 +724,29 @@ public abstract class WebUtils {
 		return urlPath.substring(begin, end);
 	}
 
+	/**
+	 * Extracts the path from the given URL by removing the query at the end 
+	 * and the scheme and authority in the front, if present.
+	 * @param url a URL, never {@code null}
+	 * @return the extracted URL path
+	 */
+	public static String extractUrlPath(String url) {
+		// Remove query/fragment
+		int end = url.indexOf('?');
+		if (end == -1) {
+			end = url.indexOf('#');
+			if (end == -1) {
+				end = url.length();
+			}
+		}
+		url = url.substring(0, end);
+		// Remove scheme + authority
+		int start = url.indexOf("://");
+		if (start != -1) {
+			start = url.indexOf('/', start + 3);
+			url = (start != -1 ) ? url.substring(start) : "";
+		}
+		return url;
+	}
+	
 }

org.springframework.web/src/test/java/org/springframework/web/util/WebUtilsTests.java

@@ -64,4 +64,15 @@ public class WebUtilsTests {
 		assertEquals("view.html", WebUtils.extractFullFilenameFromUrlPath("/products/view.html?param=/path/a.do"));
 	}
 
+	@Test
+	public void extractUriPath() {
+		assertEquals("", WebUtils.extractUrlPath("http://example.com"));
+		assertEquals("/", WebUtils.extractUrlPath("http://example.com/"));
+		assertEquals("/rfc/rfc3986.txt", WebUtils.extractUrlPath("http://www.ietf.org/rfc/rfc3986.txt"));
+		assertEquals("/over/there", WebUtils.extractUrlPath("http://example.com/over/there?name=ferret#nose"));
+		assertEquals("/over/there", WebUtils.extractUrlPath("http://example.com/over/there#nose"));
+		assertEquals("/over/there", WebUtils.extractUrlPath("/over/there?name=ferret#nose"));
+		assertEquals("/over/there", WebUtils.extractUrlPath("/over/there?url=http://example.com"));
+	}
+	
 }