topic duplicate keys/columns in custom componennt inside @elementlistener in Talend Studio

duplicate keys/columns in custom componennt inside @elementlistener

Anonymous — Fri, 02 Jan 2026 14:45:42 GMT

As you see in code snippet below, I am just printing the defaultInput.

Turns out all keys are duplicated as you see in the log snippet I have added

@ElementListener
public void onNext(
        @Input final JsonObject defaultInput,
        @Output final OutputEmitter<JsonObject> defaultOutput) {
    // this is the method allowing you to handle the input(s) and emit the output(s)
    // after some custom logic you put here, to send a value to next element you can use an
    // output parameter and call emit(value).
    logger.info("Object as string is " + defaultInput.toString());

, INFO: Object as string is {"Age":20.0,"No_of_Parents_or_Children_on_Board":0.0,"No_of_Siblings_or_Spouses_on_Board":1.0,"Passenger_Class":"\"First\"","Passenger_Fare":77.95829772949219,"Sex":"\"Female\"","Survived":"\"Yes\"","age":20.0,"no_of_Parents_or_Children_on_Board":0.0,"no_of_Siblings_or_Spouses_on_Board":1.0,"passenger_Class":"\"First\"","passenger_Fare":77.95829772949219,"sex":"\"Female\"","survived":"\"Yes\""}

My schema is as below, but all keys are duplicated, once as you see in schema and then with lower case

Re: duplicate keys/columns in custom componennt inside @elementlistener

Anonymous — Wed, 03 Oct 2018 19:07:30 GMT

Anybody else running into this ?

Re: duplicate keys/columns in custom componennt inside @elementlistener

Anonymous — Thu, 04 Oct 2018 18:57:34 GMT

Hi @bhu,

This issue has been identified and fixed for the coming version of the studio which will come with Talend Component Kit >= 1.1.0. It comes from the fact some columns don't respect Java POJO convention and therefore their getter and field names don't match and lead to a duplicate mapping between the rowStruct and JSON model.

Romain

Re: duplicate keys/columns in custom componennt inside @elementlistener

Anonymous — Thu, 04 Oct 2018 19:00:28 GMT

Thank you!!

I was losing my mind over this for some time