updated cxf version & fixed migration issues

components/identity-extensions/dynamic-client-registration/dynamic-client-web/src/main/java/org/wso2/carbon/dynamic/client/web/RegistrationResponse.java

@@ -20,7 +20,7 @@ package org.wso2.carbon.dynamic.client.web;
 import javax.ws.rs.core.MultivaluedMap;
 import javax.ws.rs.core.Response;
 
-public class RegistrationResponse extends Response {
+public abstract class RegistrationResponse extends Response {
 
     @Override
     public Object getEntity() {

pom.xml

@@ -1284,7 +1284,7 @@
         <carbon.api.mgt.version>4.3.0-SNAPSHOT</carbon.api.mgt.version>
 
         <!--CXF properties-->
-        <cxf.version>2.6.1</cxf.version>
+        <cxf.version>2.7.16</cxf.version>
         <cxf.bindings.version>2.5.11</cxf.bindings.version>
         <json-simple.version>1.1.wso2v1</json-simple.version>
         <jackson.version>1.9.0</jackson.version>