Error Message : 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)

[Poovaraj Thangamariappan]

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

[Daniel Beck]

> On 3. Mar 2018, at 07:35, Poovaraj Thangamariappan <poovar...@gmail.com> wrote:
>
> 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.
>

Downgrades are generally not supported -- and huge jumps like this even less. You *might* be able to fix this by just replacing all '1.1' in XML files' processing instructions with '1.0', but it's likely that you'll encounter further problems due to the downgrade.

Just restore from backup.

[Baptiste Mathus]

The recommended path is to use and restore your backup. Downgrading is not (yet) a supported use case.

XML version was upgraded from 1.0 to 1.1 in 2.105 https://jenkins.io/changelog/#v2.105

Looking at how often you upgrade, you really should use the LTS vesion of Jenkins, not the weekly. Cf. https://jenkins.io/download/lts/

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[Poovaraj Thangamariappan]

It is working fine after installing Jenkins 2.48 version

To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/CANWgJS6bjbspVHppJQn7YCcJbsPhr1iMWEZxxqCVmaKG3z1Vug%40mail.gmail.com.

[Aparna venugopal]

Can you please share how you fixed your issue? I got the same issue wwhen I downgraded to 2.79 

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[Mark Waite]

The only fix (as far as I know) is to edit the XML files and change the '1.1' to '1.0'.  You could do that by restoring your XML files from backup or by editing them.

Downgrade of a Jenkins version without downgrading the configuration files to match the Jenkins version is difficult.

To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/7738900f-9f4e-46c1-8e72-f3f68cdca402%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

--

Thanks!

Mark Waite

[Baptiste Mathus]

I would strongly recommend using this issue as a warning that downgrading is **not** supported with Jenkins data model. Backup your system.

The 1.1 => 1.0 should be a quite simple trick, but there will be cases that you will not be able to handle manually and need to dig into potentially many plugin's source codes to understand what changed.

To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/CAO49JtHDvEqrCtcRh7aX3Gf9X20UogWA7wdJvmEprRb5i98q1w%40mail.gmail.com.

[YUQI ZHANG]

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：