Issue 894:update to guava 12.0-rc2

core/pom.xml

@@ -99,7 +99,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>12.0-rc1</version>
+            <version>12.0-rc2</version>
         </dependency>
     </dependencies>
 

core/src/main/java/org/jclouds/util/Maps2.java

@@ -162,7 +162,7 @@ public class Maps2 {
     */
    public static <K, V> ImmutableMap<K, V> uniqueIndex(
          Iterable<? extends V> values, Function<? super V, ? extends K> keyFunction) {
-      return uniqueIndex(values, keyFunction);
+      return ImmutableMap.copyOf(Maps.uniqueIndex(values, keyFunction));
    }
 
 }