JSTL error on upgrade from IdP 4.3.2 to 5.1.2

[Peter Schober]

Mark Cairney via users <users at shibboleth.net> [2024-05-10 14:43 CEST]:
> However after startup I get the following error continually occuring in our
> idp-process.log.

Is something "continually" accessing your IDP's status handler then?
I'm asking because AFAIK the IDP works fine without JSTL except for
the status handler functionality.

> I've tried removing the jstl-1.2.jar from our edit-webapps directory and
> rebuilding the WAR file but this doesn't make any difference. Any ideas?

Did you check what's in the war files (war/ and edit-webapp/ directories)?
Maybe try cleaning out Tomcat's webapps (at least the 'idp' context)
and any temp directories.

FWIW, here's how I add JSTL in my Tomcat 10.1.x and IDP v5 setup:
https://wiki.univie.ac.at/display/federation/IDP+5+-+Step+2+-+Shibboleth+installation
(jakarta.servlet.jsp.jstl-api-3.0.0.jar from the Apache Maven repo.)

HTH,
-peter