Why only a servlet? Best way is to write a sling model and call the service from that where the service will return the object with the necessary properties.

Are you seeing that session timeout login popup in publish instance as well?

Changing the password of Admin user. Refer [1][1] https://docs.adobe.com/docs/en/aem/6-1/administer/security/granite-user-group-admin.html#Changing the Password for an Existing UserFor changing the Felix console pwd,1. Goto /system/console/configMgr2. Search for  'Apache Felix OSGi Management Consol...