Upgrading my jenkins server

Question

I am trying to upgrade my Jenkins server using version 2.89.2, to version 2.107.3. Below are the specs of my system

CentOS 6.8 Java version "1.8.0_45"

I tried to upgrade manually using the instructions here

After starting Jenkins, I get hit with the error

`Error
org.xmlpull.v1.XmlPullParserException: only 1.0 is supported as <?xml 
version not '1.1' (position: START_DOCUMENT seen <?xml 
version=\'1.1\'... @1:19) 
at 
org.xmlpull.mxp1.MXParser.parseXmlDeclWithVersion(MXParser.java:2608)
at org.xmlpull.mxp1.MXParser.parseXmlDecl(MXParser.java:2592)
at org.xmlpull.mxp1.MXParser.parsePI(MXParser.java:2466)
at org.xmlpull.mxp1.MXParser.parseProlog(MXParser.java:1447)
at org.xmlpull.mxp1.MXParser.nextImpl(MXParser.java:1395)
at org.xmlpull.mxp1.MXParser.next(MXParser.java:1093)
atcom.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.jav    a:109)
Caused: com.thoughtworks.xstream.io.StreamException:  : only 1.0 is 
supported as <?xml version not '1.1' (position: START_DOCUMENT seen <? 
xml version=\'1.1\'... @1:19) `

Seems like Jenkins is hardcoding 1.1 version to config.xml. One workaround solution is to directly edit that config.xml to make change

from: <?xml version='1.1' encoding='UTF-8'?>
To: <?xml version='1.0' encoding='UTF-8'?>

I've read that roll backs are not supported, Is there any other way I can avoid having to use 1.0 version? I can't seem to get Jenkins started without switching from XML Ver 1.1 to 1.0

Answer 1

The switch to 1.1 was in Jenkins 2.105, so you should not be affected by that message when upgrading Jenkins

Check the logs to make sure that the Jenkins starting is indeed a 2.107 one.