diff --git a/.travis.yml b/.travis.yml
index dff5f3a5d..53ebd0ee7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1 +1,6 @@
 language: java
+
+install: mvn -U install --quiet -DskipTests=true -P bootstrap
+script: mvn clean test -P bootstrap
+
+
diff --git a/spring-security-oauth/src/main/java/org/springframework/security/oauth/consumer/client/CoreOAuthConsumerSupport.java b/spring-security-oauth/src/main/java/org/springframework/security/oauth/consumer/client/CoreOAuthConsumerSupport.java
index 3852a8203..36ab3b822 100644
--- a/spring-security-oauth/src/main/java/org/springframework/security/oauth/consumer/client/CoreOAuthConsumerSupport.java
+++ b/spring-security-oauth/src/main/java/org/springframework/security/oauth/consumer/client/CoreOAuthConsumerSupport.java
@@ -647,16 +647,17 @@ protected String getSignatureBaseString(Map<String, Set<CharSequence>> oauthPara
     Iterator<Map.Entry<String, TreeSet<String>>> sortedIt = sortedParameters.entrySet().iterator();
     while (sortedIt.hasNext()) {
       Map.Entry<String, TreeSet<String>> sortedParameter = sortedIt.next();
-      for (String parameterValue : sortedParameter.getValue()) {
-        if (parameterValue == null) {
+      for (Iterator<String> sortedParametersIterator = sortedParameter.getValue().iterator(); sortedParametersIterator.hasNext();) {
+		String parameterValue = sortedParametersIterator.next();
+		if (parameterValue == null) {
           parameterValue = "";
         }
 
         queryString.append(sortedParameter.getKey()).append('=').append(parameterValue);
-        if (sortedIt.hasNext()) {
+        if (sortedIt.hasNext() || sortedParametersIterator.hasNext()) {
           queryString.append('&');
         }
-      }
+	}
     }
 
     StringBuilder url = new StringBuilder(requestURL.getProtocol().toLowerCase()).append("://").append(requestURL.getHost().toLowerCase());
diff --git a/spring-security-oauth/src/test/java/org/springframework/security/oauth/consumer/client/TestCoreOAuthConsumerSupport.java b/spring-security-oauth/src/test/java/org/springframework/security/oauth/consumer/client/TestCoreOAuthConsumerSupport.java
index 8a2fddd6e..05e898f6f 100644
--- a/spring-security-oauth/src/test/java/org/springframework/security/oauth/consumer/client/TestCoreOAuthConsumerSupport.java
+++ b/spring-security-oauth/src/test/java/org/springframework/security/oauth/consumer/client/TestCoreOAuthConsumerSupport.java
@@ -38,8 +38,10 @@
 import java.net.URL;
 import java.net.URLConnection;
 import java.net.URLEncoder;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.LinkedHashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeMap;
@@ -79,7 +81,8 @@ public void testAfterPropertiesSet() throws Exception {
 		try {
 			new CoreOAuthConsumerSupport().afterPropertiesSet();
 			fail("should required a protected resource details service.");
-		} catch (IllegalArgumentException e) {
+		}
+		catch (IllegalArgumentException e) {
 		}
 	}
 
@@ -146,7 +149,8 @@ public URL configureURLForProtectedAccess(URL url, OAuthConsumerToken accessToke
 				try {
 					return new URL(url.getProtocol(), url.getHost(), url.getPort(), url.getFile(),
 							new StreamHandlerForTestingPurposes(connectionMock));
-				} catch (MalformedURLException e) {
+				}
+				catch (MalformedURLException e) {
 					throw new RuntimeException(e);
 				}
 			}
@@ -165,7 +169,8 @@ public String getOAuthQueryString(ProtectedResourceDetails details, OAuthConsume
 		try {
 			support.readResource(details, url, "POST", token, null, null);
 			fail("shouldn't have been a valid response code.");
-		} catch (OAuthRequestFailedException e) {
+		}
+		catch (OAuthRequestFailedException e) {
 			// fall through...
 		}
 		assertFalse(connectionProps.doOutput);
@@ -181,7 +186,8 @@ public String getOAuthQueryString(ProtectedResourceDetails details, OAuthConsume
 		try {
 			support.readResource(details, url, "POST", token, null, null);
 			fail("shouldn't have been a valid response code.");
-		} catch (OAuthRequestFailedException e) {
+		}
+		catch (OAuthRequestFailedException e) {
 			// fall through...
 		}
 		assertFalse(connectionProps.doOutput);
@@ -198,7 +204,8 @@ public String getOAuthQueryString(ProtectedResourceDetails details, OAuthConsume
 		try {
 			support.readResource(details, url, "POST", token, null, null);
 			fail("shouldn't have been a valid response code.");
-		} catch (InvalidOAuthRealmException e) {
+		}
+		catch (InvalidOAuthRealmException e) {
 			// fall through...
 		}
 		assertFalse(connectionProps.doOutput);
@@ -400,8 +407,8 @@ protected String getSignatureBaseString(Map<String, Set<CharSequence>> oauthPara
 		when(details.getSignatureMethod()).thenReturn(HMAC_SHA1SignatureMethod.SIGNATURE_NAME);
 		SharedConsumerSecret secret = new SharedConsumerSecretImpl("shh!!!");
 		when(details.getSharedSecret()).thenReturn(secret);
-		when(sigFactory.getSignatureMethod(HMAC_SHA1SignatureMethod.SIGNATURE_NAME, secret, null)).thenReturn(
-				sigMethod);
+		when(sigFactory.getSignatureMethod(HMAC_SHA1SignatureMethod.SIGNATURE_NAME, secret, null))
+				.thenReturn(sigMethod);
 		when(sigMethod.sign("MYSIGBASESTRING")).thenReturn("MYSIGNATURE");
 
 		Map<String, Set<CharSequence>> params = support.loadOAuthParameters(details, url, token, "POST", null);
@@ -446,6 +453,33 @@ public void testGetSignatureBaseString() throws Exception {
 				baseString);
 	}
 
+	@Test
+	public void testGetSignatureBaseStringSimple() throws Exception {
+		Map<String, Set<CharSequence>> oauthParams = new HashMap<String, Set<CharSequence>>();
+		oauthParams.put("foo", Collections.singleton((CharSequence) "bar"));
+		oauthParams.put("bar", new LinkedHashSet<CharSequence>(Arrays.<CharSequence> asList("120", "24")));
+
+		CoreOAuthConsumerSupport support = new CoreOAuthConsumerSupport();
+
+		String baseString = support.getSignatureBaseString(oauthParams, new URL("http://photos.example.net/photos"),
+				"get");
+		assertEquals("GET&http%3A%2F%2Fphotos.example.net%2Fphotos&bar%3D120%26bar%3D24%26foo%3Dbar", baseString);
+	}
+
+	// See SECOAUTH-383
+	@Test
+	public void testGetSignatureBaseStringMultivaluedLast() throws Exception {
+		Map<String, Set<CharSequence>> oauthParams = new HashMap<String, Set<CharSequence>>();
+		oauthParams.put("foo", Collections.singleton((CharSequence) "bar"));
+		oauthParams.put("pin", new LinkedHashSet<CharSequence>(Arrays.<CharSequence> asList("2", "1")));
+
+		CoreOAuthConsumerSupport support = new CoreOAuthConsumerSupport();
+
+		String baseString = support.getSignatureBaseString(oauthParams, new URL("http://photos.example.net/photos"),
+				"get");
+		assertEquals("GET&http%3A%2F%2Fphotos.example.net%2Fphotos&foo%3Dbar%26pin%3D1%26pin%3D2", baseString);
+	}
+
 	static class StreamHandlerForTestingPurposes extends Handler {
 
 		private final HttpURLConnectionForTestingPurposes connection;
@@ -469,7 +503,7 @@ static class HttpURLConnectionForTestingPurposes extends HttpURLConnection {
 
 		/**
 		 * Constructor for the HttpURLConnection.
-		 *
+		 * 
 		 * @param u the URL
 		 */
 		public HttpURLConnectionForTestingPurposes(URL u) {
@@ -490,11 +524,17 @@ public void connect() throws IOException {
 	static class ConnectionProps {
 
 		public int responseCode;
+
 		public String responseMessage;
+
 		public String method;
+
 		public Boolean doOutput;
+
 		public Boolean connected;
+
 		public OutputStream outputStream;
+
 		public final Map<String, String> headerFields = new TreeMap<String, String>();
 
 		public void reset() {