Issue
I can see java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser errors in the logs and some plugin or functionality is not working on Jenkins.
Environment
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CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
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CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
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CloudBees CI (CloudBees Core) on traditional platforms - Client controller
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CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
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CloudBees Jenkins Enterprise
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CloudBees Jenkins Enterprise - Managed controller
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CloudBees Jenkins Enterprise - Operations center
Evidence
You are seeing a combination of the code below in your logs:
Caused: org.xml.sax.SAXException: SAX2 driver class org.apache.xerces.parsers.SAXParser not found java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser
This means something changed the SAX driver, so any plugin that should use XML parsing could stop working correctly.
Workaround
A possible workaround to try solving this issue is adding the Java argument:
-Dorg.xml.sax.driver=com.sun.org.apache.xerces.internal.parsers.SAXParser