Which Java stack to choose for a recommendation service?

Question

Java

Hello everyone
I want to write a fairly large recommendation web service for a specific group of goods. Requirements:
1) Fast delivery of pages to users
2) Parsing of competing sites (data parsing)
3) Working with giants ozon / ali / ebay via api
4) Working with date - building graphics, building reports
5) Rest for an Android application.
We need some popular and demanded java framework. What to take?
Ps From php / python / ruby ​​- I refuse, because I want to learn Java

Answer 1

Spring