Issue
SSO authentication is working, but I see an angry Jenkins Oops! A problem occurred while processing the request, as well as NullPointerException in the logs (below), after logging into my environment:
2024-10-16 15:24:43.675+0000 [id=3633663] WARNING h.i.i.InstallUncaughtExceptionHandler#handleException: Caught unhandled exception with ID ... java.lang.NullPointerException at org.jenkinsci.plugins.saml.SamlSecurityRealm.modifyUserSamlCustomAttributes(SamlSecurityRealm.java:405) at org.jenkinsci.plugins.saml.SamlSecurityRealm.doFinishLogin(SamlSecurityRealm.java:345
Resolution
This NullPointerException indicates that the modifyUserSamlCustomAttributes() method is returning a null or empty value. From the Operations Center SAML configuration, there will be empty values for SAML Attributes under the Custom Attributes section in your Manage Jenkins > Configure Global Security.
Delete this empty field box, if not being used, by clicking the red Delete button, or the red X on the right side of this box, then clicking Save at the bottom of the page.
