topic Re: how to process the next iteration when the first one failed? in Talend Studio

how to process the next iteration when the first one failed?

jerownimow — Sat, 16 Nov 2024 07:23:03 GMT

Hi folks,

I have a subjob with the design below:
tHashInput -> tFlowtoIterate -> tFixedFlowInput ->tJavaRow -> tRestClient -> and so on...

So inside the tHashInput, I have a field called EmpDN which I want to be used as a parameter in tRestClient. To do this, I put the tFlowtoIterate and tFixedFlowInput, to get the EmpDN row by row value, and store it accordingly in a context variable via tJavaRow. The problem is, when the first output of EmpDN that has been stored in context and be used respectively in tRestClient as a parameter and the response is an error or HTTP 404 Not Found, the job will stop already.

What I want to happen is, even if the tRestClient responded an error, it should still continue to iterate on the next value and so on.

Can you please help me how to achieve this?

Thank you in advance!

Re: how to process the next iteration when the first one failed?

David_Beaty — Tue, 30 Oct 2018 10:28:25 GMT

Hi,

Couple of things to check/try.

1/ Untick the "Die on error" on the tRestClient component.

2/ Use a tJavaFlex component with the Java code of "try" & "catch", so you can handle the failure yourself/cleanly.

Thanks

David

Re: how to process the next iteration when the first one failed?

jerownimow — Tue, 30 Oct 2018 12:47:20 GMT

Hi David,

Thank you for your response. Die on error is already untick, but I haven't tried the tJavaflex.

Can you expound how to use the tJavaFlex, and where to incorporate it on my current design? Thank you in advance.

Re: how to process the next iteration when the first one failed?

David_Beaty — Tue, 30 Oct 2018 13:35:02 GMT

Hi,

Something like:

tHashInput -> tFlowtoIterate -> tJavaFlex (iterate) -> tFixedFlowInput ->tJavaRow -> tRestClient ->

With the tJavaFlex setup like:

Start Code

globalMap.put("RestFailure", false);
try {

Main Code

(nothing)

End Code

} catch (Exception ex) {
globalMap.put("RestFailure", true);
}

Re: how to process the next iteration when the first one failed?

jerownimow — Fri, 02 Nov 2018 15:18:02 GMT

Hi David,

It worked though I really don't get what does the code do. Thank you!

Just want to ask if there is a need for the RestFailure to be declared,or it is a default?

Re: how to process the next iteration when the first one failed?

Anonymous — Thu, 28 Nov 2019 08:55:34 GMT

Thanks, David!

I really hadn't realized one could use tJavaFlex to handle try/catch, but it makes sense now that you say it.

Big thanks!

Regards, Jan Terje