Read-only Processor schema and/or appending output schema

cjj — Fri, 02 Jan 2026 14:45:42 GMT

Hi,

I'm trying to make a component that will modify just one specific field and return a new input.

I'm using the Talend Component Kit for this, and building the component in Java.

I'm struggling to create a component that has:

A fixed input, with a pre-named field (e.g. myInputField) that will be used in the processor as a source on the input row
A fixed output, with a pre-named field (e.g. myProcessedFieldOutput) that will be output from the processor as a row

Ideally, this would be like the tAddLocationFromIP component, whereby you choose the field from the input that you want to use:

and it appends a non-optional additional field

Is it possible to do this? I can't see any examples or other sources on GitHub that seem to achieve this, but I'm hoping it's possible?

Re: Read-only Processor schema and/or appending output schema

ozhelezniak — Thu, 11 Feb 2021 09:21:01 GMT

Hi @CHrisa Jackson

Frankly, I think I didn't understand your question. Could you explain a bit more want do you want to get?

I'll try to answer.

You can control how many rows your component will produce. You can build a record with recordFactory (it's a service so you can inject in into your input and output component classes).

For input:

@Producer

public Record next() throws Exception {

Record record = this.recordFactory.newRecordBuilder().withString("desiredField", "Your speicific Value").build();

return record;

}

https://talend.github.io/component-runtime/main/1.28.2/tutorial-create-an-input-component.html

topic Re: Read-only Processor schema and/or appending output schema in Talend Studio

Read-only Processor schema and/or appending output schema

Re: Read-only Processor schema and/or appending output schema