I'm having some issues with a just installed ZCM 11.3a server. I'm getting a lot of errors:

org.jdom.JDOMException: Could not load default SAX parser: org.apache.xerces.parsers.SAXParser: SAX2 driver class org.apache.xerces.parsers.SAXParser not found: org.apache.xerces.parsers.SAXParser

in services-messages.log

I have googled for the error message but can't find anything related to ZCM. Any idea about how to fix it?