Talend Studio: Apache HttpClient Invalid cookie header warnings during Excel output

Lusemar_Oliveira — Wed, 02 Sep 2026 08:41:09 GMT

When executing a Talend Job that writes data to an Excel file, the Job may generate repeated warnings similar to:

[WARN ] 08:39:14 org.apache.http.client.protocol.ResponseProcessCookies -
Invalid cookie header: "set-cookie: activate_ca_modal_triggered="";
Expires=Thu, 01 Jan 1970 00:00:10 GMT; Path=/".
Invalid 'expires' attribute: Thu, 01 Jan 1970 00:00:10 GMT

The same Job may execute without these warnings when the output component is changed to tFileOutputDelimited.

In most cases, this message is generated by Apache HttpClient while processing an HTTP response cookie. It is a warning from the HTTP client cookie parser and is not, by itself, evidence that the Excel output operation has failed.

Talend's tFileOutputExcel component writes Excel files as part of the File component family.

Resolution

Because the warning is cosmetic, the recommended approach is to suppress the specific logger.

In Talend Studio, navigate to File > Edit Project Properties.
Go to Log4j (or Log4j2, depending on your Studio version).
Add the following XML configuration snippet inside the <Loggers> section of your log4j2.xml (or log4j.xml) template:

XML

 <Logger name="org.apache.http.client.protocol.ResponseProcessCookies" level="ERROR" additivity="false"> <AppenderRef ref="Console"/> </Logger> <Logger name="org.apache.http" level="ERROR" additivity="false"> <AppenderRef ref="Console"/> </Logger>
Click Apply and Close to save the project settings.
Re-run the job locally in Studio or redeploy the job artifact to your Remote Engine / Job Server.
Confirm that the ResponseProcessCookies warning no longer appears in the console output.

Cause

The warning originates from Apache HttpClient, used internally by Talend and related libraries such as Apache POI or components that perform HTTP-related operations.

During Excel output processing, a library initialization or background request can receive a Set-Cookie header that uses an Expires value in the past (Thu, 01 Jan 1970...). This is a standard technique to delete a cookie. Apache HttpClient’s default cookie specification is strict about date formatting and logs a WARN-level message when it cannot parse the attribute according to its expected rules.

The delimited-file path does not trigger the same library behavior or HTTP interaction, so the warning does not appear. The message is purely informational and does not affect data integrity, job success, or the generated Excel file.

Environment

Talend Studio

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Talend Studio: Apache HttpClient Invalid cookie header warnings during Excel output

Resolution

Cause

Environment