Restore of Jenkins 1.616 back to 1.555

[Paul Wilkins]

I was required to upgrade our jenkins install to the latest.   Once this was done I encountered some unexpected issues which forced me to want to restore back to 1.555.

This is all running on a windows server 2012 running using Java 7 although there is an folder for jre1.8.0_45.   This is an old system I inherited so I am bit vague on details.   

I hit the Restore to v1.555 button and all seemed ok.   Once I restarted the machine and opened Jenkins I get the following message.

If there are anymore details that might help solve this issue please let me know.   Thank you.

hudson.util.HudsonFailedToLoad: org.jvnet.hudson.reactor.ReactorException: java.io.IOException: Unable to read D:\Jenkins\config.xml
	at hudson.WebAppMain$3.run(WebAppMain.java:234)
Caused by: org.jvnet.hudson.reactor.ReactorException: java.io.IOException: Unable to read D:\Jenkins\config.xml
	at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:269)
	at jenkins.InitReactorRunner.run(InitReactorRunner.java:44)
	at jenkins.model.Jenkins.executeReactor(Jenkins.java:910)
	at jenkins.model.Jenkins.<init>(Jenkins.java:809)
	at hudson.model.Hudson.<init>(Hudson.java:82)
	at hudson.model.Hudson.<init>(Hudson.java:78)
	at hudson.WebAppMain$3.run(WebAppMain.java:222)
Caused by: java.io.IOException: Unable to read D:\Jenkins\config.xml
	at hudson.XmlFile.unmarshal(XmlFile.java:165)
	at jenkins.model.Jenkins$17.run(Jenkins.java:2561)
	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
	at jenkins.model.Jenkins$7.runTask(Jenkins.java:899)
	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: com.thoughtworks.xstream.converters.ConversionException: -1 : -1
---- Debugging information ----
message             : -1
cause-exception     : java.lang.ArrayIndexOutOfBoundsException
cause-message       : -1
class               : hudson.model.Hudson
required-type       : hudson.model.Hudson
converter-type      : hudson.util.RobustReflectionConverter
path                : /hudson/disabledAdministrativeMonitors
line number         : 3
version             : not available
-------------------------------
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1061)
	at hudson.util.XStream2.unmarshal(XStream2.java:113)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1045)
	at hudson.XmlFile.unmarshal(XmlFile.java:163)
	... 9 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
	at com.thoughtworks.xstream.core.util.OrderRetainingMap.entrySet(OrderRetainingMap.java:77)
	at java.util.HashMap.putMapEntries(Unknown Source)
	at java.util.HashMap.putAll(Unknown Source)
	at com.thoughtworks.xstream.core.util.OrderRetainingMap.<init>(OrderRetainingMap.java:36)
	at com.thoughtworks.xstream.converters.reflection.FieldDictionary.buildMap(FieldDictionary.java:135)
	at com.thoughtworks.xstream.converters.reflection.FieldDictionary.fieldOrNull(FieldDictionary.java:113)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.getFieldOrNull(PureJavaReflectionProvider.java:186)
	at hudson.util.RobustReflectionConverter.fieldDefinedInClass(RobustReflectionConverter.java:344)
	at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:283)
	at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:228)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
	... 18 more

[Daniel Beck]

Downgrading to 1.555 from 1.616 is a lot of effort and requires quite a bit of Jenkins knowledge due to changed data formats between these versions, plugins detached from core, etc.

Your best bet is to restore from backup.

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[Paul Wilkins]

Thanks for spending your time looking at this.   I had a thought that it would be a lost cause.   I'll have to look over the old images of the machine and see what I have got.

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[James Nord]

By any chance did you upgrade to jdk 8 at the same time?
You may get lucky by downgrading to 1.7 as that looks like a buggy comparator being called to null.
But only lucky if you never saved the system or job configurations post upgrade...