(1)open code upgrade tool and import 6.2sdk or maven project
(2)switch to the find breaking change page
(3)right click on the problem "Moved MVCPortlet, ActionCommand and ActionCommandCache from util-bridges.jar to portal-service.jar." (can found in the portlet.xml in the sample-json-portal project) and correct automatically it.
(4)After correct it ,it will show blank in the editor.