--- a/server/pom.xml	Wed Dec 11 11:36:08 2013 +0100
+++ b/server/pom.xml	Tue Dec 17 22:41:20 2013 +0100
@@ -442,6 +442,11 @@
             <artifactId>java-uuid-generator</artifactId>
             <version>${fasterxml-java-uuid-generator-version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>4.0</version>
+        </dependency>
     </dependencies>
     <organization>
         <name>IRI</name>