Merge pull request #809 from janakamarasena/high-priority-fixes-2

Fixes NPE when using Access Token grant handler

components/identity-extensions/org.wso2.carbon.device.mgt.oauth.extensions/src/main/java/org/wso2/carbon/device/mgt/oauth/extensions/handlers/grant/AccessTokenGrantHandler.java

@@ -51,7 +51,7 @@ public class AccessTokenGrantHandler extends AbstractAuthorizationGrantHandler {
 
     public AccessTokenGrantHandler() {
         try {
-            // tokenValidator = OAuthValidatorFactory.getValidator();
+            tokenValidator = new LocalOAuthValidator();
         } catch (IllegalArgumentException e) {
             log.error("Failed to initialise Authenticator", e);
         }