queryBuilder.Execute() is returning null result

Question

I am able to make query from QueryBuilder, and query is working fine while executing directly in Fredhopper.

But surprisingly I am getting no results in my DD4T MVC application.

i.e ResultSet fredHopperResultset = queryBuilder.Execute(); returns null in my application although QueryBuilder contains correct query.

I checked smart target logs where I found no errors, also FredHopper log contains right Fredhopper query,only one thing which i noticed in my Fredhopper logs that it contains 8181 port instead of 8180 that is

http://127.0.0.1:8181/fredhopper/query?fh_location=%2F%2Fcatalog01%2Fen_USsomeothertriggers

Although while executing i get same results by

http://127.0.0.1:8181/fredhopper/query?fh_location=%2F%2Fcatalog01%2Fen_USsomeothertriggers

and

http://127.0.0.1:8180/fredhopper/query?fh_location=%2F%2Fcatalog01%2Fen_USsomeothertriggers

Answer 1

There could be few things which you can check for the reason why your query is returning result while executing directly in fredhopper and not returning result in your application:

1. Check the log of your application if your query is getting timed out.
2. You default promotion with title containing "Do not remove" is present in fredhopper.
3. Check your application and fredhopper log if you are able to see any error message.

Answer 2

Also make sure that,

1. The publication context of your web application and published content's should be same.

2. Claims(triggers) are passed to your query as shown below:

   ClaimStore claims = AmbientDataContext.CurrentClaimStore;
   String triggers = AmbientDataHelper.GetTriggers(claims);
   ....
   QueryBuilder QB = new QueryBuilder("catalog01","en_US");
   QB.AddCriteria(new Tridion.SmartTarget.Query.Builder.PublicationCriteria(new TcmUri("tcm:0-12-1")));
   .....
   QB.Parse(triggers);