3789344 - Http request with POST method may end up with "405 Method Not Allowed" error due to misconfiguration of "multipart-config" after upgrading to JDK21 and Spring Framework 6.2+

Symptom

HTTP POST requests return 405 Method Not Allowed after upgrading to JDK 21 and Spring Framework 6.2+.
The request Content-Type is multipart/form-data
Exclude CSRF-related causes first. See this SAP KBA: 3670785 - Http request with POST method may end up with "405 Method Not Allowed" error due to in Spring 6 CSRF token handling got slightly changed

Environment

SAP Commerce Cloud 2211 (JDK 21)

Product

SAP Commerce Cloud 2211 for JDK21

Keywords

405 Method Not Allowed, POST, JDK21, Spring 6.2, Framework Upgrade, multipart-config, StandardServletMultipartResolver , KBA , CEC-SCC-PLA-PL , Platform , Problem

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