Java Ecommerce Recommendation Engine giving empty results

[Anagha Joshi]

Hi,

We followed the following document to get a basic ecommerce recommendation engine up:

Template Used: pio template get PredictionIO/template-scala-parallel-ecommercerecommendation <YourNewEngineDir>
Document followed: https://docs.prediction.io/templates/ecommercerecommendation/quickstart/

However we tweaked in a few steps to get the engine up and running:
1) engineFactory value was changed (this was not mentioned in the quickstart)
2) Imported data as per the quickstart document
3) Downloaded the postgresql-9.4.1208.jre6.jar driver
4) Ran the following commands:
    pio build
    pio train -- --driver-class-path postgresql-9.4.1208.jre6.jar
    pio deploy -- --driver-class-path postgresql-9.4.1208.jre6.jar

Everything worked fine and then we tried to get recommendations. But we always got empty itemScores array. Could you please help us with this?

I am attaching the engine.json file for your reference.

Regards,
Anagha Joshi