diff --git a/org.springframework.integration.http/src/main/java/org/springframework/integration/http/DefaultInboundRequestMapper.java b/org.springframework.integration.http/src/main/java/org/springframework/integration/http/DefaultInboundRequestMapper.java
index ca4f6091c6..587f98e4ac 100644
--- a/org.springframework.integration.http/src/main/java/org/springframework/integration/http/DefaultInboundRequestMapper.java
+++ b/org.springframework.integration.http/src/main/java/org/springframework/integration/http/DefaultInboundRequestMapper.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2010 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.
@@ -20,7 +20,9 @@ import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.ObjectInputStream;
+import java.io.Serializable;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.HashMap;
@@ -36,6 +38,8 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.integration.core.Message;
 import org.springframework.integration.message.MessageBuilder;
 import org.springframework.util.FileCopyUtils;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
 import org.springframework.web.multipart.MultipartException;
 import org.springframework.web.multipart.MultipartFile;
 import org.springframework.web.multipart.MultipartHttpServletRequest;
@@ -47,8 +51,10 @@ import org.springframework.web.multipart.MultipartResolver;
  * <ul>
  * <li>For a GET request or a POST request with a Content-Type of
  * "application/x-www-form-urlencoded", the parameter Map will be copied as the
- * payload. The map's keys will be Strings, and the values will be String arrays
- * as described for {@link ServletRequest#getParameterMap()}.</li>
+ * payload. The map will be an instance of {@link MultiValueMap} where the keys are
+ * Strings and the values are Lists of Strings. Those Lists are populated from the
+ * String array values of the original request parameter Map as described for the
+ * {@link ServletRequest#getParameterMap()} method.</li>
  * <li>If a MultipartResolver has been provided, and a multipart request is
  * detected, the multipart file content will be converted to String for any
  * "text" content type, or byte arrays otherwise.</li>
@@ -231,8 +237,7 @@ public class DefaultInboundRequestMapper implements InboundRequestMapper {
 
 	@SuppressWarnings("unchecked")
 	private Object createPayloadFromParameterMap(HttpServletRequest request) {
-		Map<String, String[]> parameterMap = new HashMap<String, String[]>(request.getParameterMap());
-		return Collections.unmodifiableMap(parameterMap);
+		return new UnmodifiableRequestParameterMap(request.getParameterMap());
 	}
 
 	private Object createPayloadFromTextContent(HttpServletRequest request) throws IOException {
@@ -289,4 +294,61 @@ public class DefaultInboundRequestMapper implements InboundRequestMapper {
 		builder.setHeader(HttpHeaders.USER_PRINCIPAL, request.getUserPrincipal());
 	}
 
+
+	/**
+	 * Map class that extends {@link LinkedMultiValueMap} and implements Serializable.
+	 * The contents of the map are unmodifiable, so calling any modification operation
+	 * (e.g. put, add, or remove) will result in an UnsupportedOperationException. 
+	 */
+	private static class UnmodifiableRequestParameterMap
+			extends LinkedMultiValueMap<String, String> implements Serializable {
+
+		UnmodifiableRequestParameterMap(Map<String, String[]> parameters) {
+			for (Map.Entry<String, String[]> entry : parameters.entrySet()) {
+				super.put(entry.getKey(), Arrays.asList(entry.getValue()));
+			}
+		}
+
+		@Override
+		public void add(String key, String value) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void clear() {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public List<String> put(String key, List<String> value) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void putAll(Map<? extends String, ? extends List<String>> m) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public List<String> remove(Object key) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void set(String key, String value) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void setAll(Map<String, String> values) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public Map<String, String> toSingleValueMap() {
+			return Collections.unmodifiableMap(super.toSingleValueMap());
+		}
+
+	}
+
 }
diff --git a/org.springframework.integration.http/src/test/java/org/springframework/integration/http/HttpInboundEndpointTests.java b/org.springframework.integration.http/src/test/java/org/springframework/integration/http/HttpInboundEndpointTests.java
index be72970f18..b763ed787f 100644
--- a/org.springframework.integration.http/src/test/java/org/springframework/integration/http/HttpInboundEndpointTests.java
+++ b/org.springframework.integration.http/src/test/java/org/springframework/integration/http/HttpInboundEndpointTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2010 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.
@@ -16,30 +16,6 @@
 
 package org.springframework.integration.http;
 
-import org.easymock.IAnswer;
-import org.easymock.classextension.ConstructorArgs;
-import org.junit.Before;
-import org.junit.Test;
-import org.springframework.integration.core.Message;
-import org.springframework.integration.core.MessageChannel;
-import org.springframework.integration.core.MessageHeaders;
-import org.springframework.integration.message.StringMessage;
-import org.springframework.mock.web.MockHttpServletRequest;
-import org.springframework.mock.web.MockHttpServletResponse;
-import org.springframework.web.servlet.View;
-
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.UnsupportedEncodingException;
-import java.security.Principal;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.Map;
-
 import static org.easymock.EasyMock.anyObject;
 import static org.easymock.EasyMock.eq;
 import static org.easymock.EasyMock.expect;
@@ -54,6 +30,35 @@ import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.CoreMatchers.notNullValue;
 import static org.junit.Assert.assertThat;
 
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.UnsupportedEncodingException;
+import java.security.Principal;
+import java.util.Collections;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.easymock.IAnswer;
+import org.easymock.classextension.ConstructorArgs;
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.integration.core.Message;
+import org.springframework.integration.core.MessageChannel;
+import org.springframework.integration.core.MessageHeaders;
+import org.springframework.integration.message.StringMessage;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.mock.web.MockHttpServletResponse;
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.servlet.View;
+
 /**
  * @author Alex Peters
  */
@@ -125,8 +130,8 @@ public class HttpInboundEndpointTests {
 					final Map<?, ?> msgParams = (Map<?, ?>) ((Message) getCurrentArguments()[0]).getPayload();
 					assertThat(msgParams.size(), is(sourceParams.size()));
 					for (String key : sourceParams.keySet()) {
-						assertThat((String[]) msgParams.get(key),
-								is(new String[] { sourceParams.get(key) }));
+						assertThat((List<String>) msgParams.get(key),
+								is(Collections.singletonList(sourceParams.get(key))));
 					}
 					return true;
 				}
@@ -228,10 +233,11 @@ public class HttpInboundEndpointTests {
 			new IAnswer<Boolean>() {
 				@SuppressWarnings("unchecked")
 				public Boolean answer() throws Throwable {
-					Map<String, String> payloadMap = (Map<String, String>) ((Message) getCurrentArguments()[0]).getPayload();
+					MultiValueMap<String, String> payloadMap = (MultiValueMap<String, String>)
+							((Message) getCurrentArguments()[0]).getPayload();
 					for (String key : sourceParams.keySet()) {
 						assertThat(payloadMap.get(key),
-								is((Object) new String[] { sourceParams.get(key) }));
+								is(Collections.singletonList(sourceParams.get(key))));
 					}
 					return true;
 				}
@@ -339,6 +345,7 @@ public class HttpInboundEndpointTests {
 	}
 
 	@Test
+	@SuppressWarnings("unchecked")
 	public void handleRequest_expectReplyWithView_responseDirectedToView() throws Exception {
 		setupEndpointAsMock(ANY_STRING_PAYLOAD);
 		View view = createMock(View.class);
diff --git a/org.springframework.integration.http/src/test/java/org/springframework/integration/http/config/HttpInboundChannelAdapterParserTests.java b/org.springframework.integration.http/src/test/java/org/springframework/integration/http/config/HttpInboundChannelAdapterParserTests.java
index 151690b113..323c9e3dec 100644
--- a/org.springframework.integration.http/src/test/java/org/springframework/integration/http/config/HttpInboundChannelAdapterParserTests.java
+++ b/org.springframework.integration.http/src/test/java/org/springframework/integration/http/config/HttpInboundChannelAdapterParserTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2010 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.
@@ -25,7 +25,6 @@ import java.io.ByteArrayOutputStream;
 import java.io.ObjectOutputStream;
 import java.io.Serializable;
 import java.util.List;
-import java.util.Map;
 
 import javax.servlet.http.HttpServletResponse;
 
@@ -42,6 +41,7 @@ import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpServletResponse;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.util.MultiValueMap;
 
 /**
  * @author Mark Fisher
@@ -75,12 +75,12 @@ public class HttpInboundChannelAdapterParserTests {
 		Message<?> message = requests.receive(0);
 		assertNotNull(message);
 		Object payload = message.getPayload();
-		assertTrue(payload instanceof Map);
-		Map<String, String[]> map = (Map<String, String[]>) payload;
+		assertTrue(payload instanceof MultiValueMap);
+		MultiValueMap<String, String> map = (MultiValueMap<String, String>) payload;
 		assertEquals(1, map.size());
 		assertEquals("foo", map.keySet().iterator().next());
-		assertEquals(1, map.get("foo").length);
-		assertEquals("bar", map.get("foo")[0]);
+		assertEquals(1, map.get("foo").size());
+		assertEquals("bar", map.getFirst("foo"));
 	}
 
 	@Test