My need is to get data of say 10 lifelog users (example my project teammates )
I want to analyse their data and do some scoring to create fitness competition within my team.
If I have all these life log ID and password Will I be able to read the data from a java application and save it all in one DB? I will analyze these data and provide score and targets.
Finally : I will have a separate mobile app that will be using the data from my java application.
Actually the way to get the data from your teammates is by authenticating them with your app:
https://developer.sony.com/develop/services/lifelog-api/authentication/
Once they have authenticated with your app then you can use the API to pull data to score them with.
There is not a way to take their username and password and pull data dynamically through the API.