I came across the same problem when I upgrade jenkins first then downgrade it .
my solution here hopes could help someone: 1. service jenkins stop 2. mv JENKINS_HOME/config.xml JENKINS_HOME/config.xml_bak 3. service jenkins start then I can use jenkins without authentication. there are still some problems which is not totally fixed I simply upgrade jenkins again and recover original config.xml by doing: mv JENKINS_HOME/config.xml_bak JENKINS_HOME/config.xml service jenkins restart finally every job can be built again normally. thanks god. I would never trying to do this upgrading/downgrading things without backup! 在 2018年3月3日星期六 UTC+8下午6:23:27，Poovaraj Thangamariappan写道： > > Hi Team, > > I have downgraded Jenkins latest version to old version(2.48). I got below > error message after launch the Jenkins. Please help me to fix this issues. > > 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) > at > com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java: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) > at > com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java:124) > at > com.thoughtworks.xstream.io.xml.AbstractPullReader.readRealEvent(AbstractPullReader.java:148) > at > com.thoughtworks.xstream.io.xml.AbstractPullReader.readEvent(AbstractPullReader.java:141) > at > com.thoughtworks.xstream.io.xml.AbstractPullReader.move(AbstractPullReader.java:118) > at > com.thoughtworks.xstream.io.xml.AbstractPullReader.moveDown(AbstractPullReader.java:103) > at com.thoughtworks.xstream.io.xml.XppReader.<init>(XppReader.java:63) > at > com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:54) > at > com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:65) > at hudson.XmlFile.unmarshal(XmlFile.java:159) > Caused: java.io.IOException: Unable to read C:\Users\poo\.jenkins\config.xml > at hudson.XmlFile.unmarshal(XmlFile.java:161) > at jenkins.model.Jenkins.loadConfig(Jenkins.java:3022) > at jenkins.model.Jenkins.access$1200(Jenkins.java:304) > at jenkins.model.Jenkins$16.run(Jenkins.java:3040) > at > org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169) > at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282) > at jenkins.model.Jenkins$7.runTask(Jenkins.java:1064) > at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210) > at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117) > at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown > Source) > at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown > Source) > at java.base/java.lang.Thread.run(Unknown Source) > Caused: org.jvnet.hudson.reactor.ReactorException > at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:269) > at jenkins.InitReactorRunner.run(InitReactorRunner.java:47) > at jenkins.model.Jenkins.executeReactor(Jenkins.java:1088) > at jenkins.model.Jenkins.<init>(Jenkins.java:904) > at hudson.model.Hudson.<init>(Hudson.java:85) > at hudson.model.Hudson.<init>(Hudson.java:81) > at hudson.WebAppMain$3.run(WebAppMain.java:231) > Caused: hudson.util.HudsonFailedToLoad > at hudson.WebAppMain$3.run(WebAppMain.java:248) > > > Regards, > Poovaraj > -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to jenkinsci-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/4c644b8e-6ad5-4913-8269-78e42bdf5afa%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
