We are also facing the same issue, where we are not able to see page
properties on AEM 6.3. In the log, we are getting the below error.
org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught
SlingExceptionjava.lang.NullPointerException: null As per the suggested
solution here, We have deleted subfolders under /var/clientlibs &
/var/classes, Then recompiled all jsp files using the link
http://localhost:4502/system/console/slingjspIt's working fine now, We
are able to see page pr...