Unable to access jenkins after rollback to previous version

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1

I recently upgraded Jenkins by creating a new AMI on AWS using Jenkins version 2.426.1. However, we encountered some problems following the upgrade and promptly rolled back to previous Jenkins version 2.346.2. Since then, I’m seeing the error below and am unable to log in to the Jenkins user interface.

com.thoughtworks.xstream.mapper.CannotResolveClassException: com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy
at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:81)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:411)
at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:46)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:47)
at hudson.util.RobustReflectionConverter.determineType(RobustReflectionConverter.java:521)
at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:346)
Caused: jenkins.util.xstream.CriticalXStreamException:
com.thoughtworks.xstream.mapper.CannotResolveClassException: com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy
at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:81)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:411)
at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:46)
at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:47)
at hudson.util.RobustReflectionConverter.determineType(RobustReflectionConverter.java:521)
at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:346)
Caused: jenkins.util.xstream.CriticalXStreamException:

2

How did you perform the rollback? Did you have a backup that you restored that included the plugins directory or you just changed the Jenkins version?
Most likely you should see in your jenkins logs earlier a problem about plugins that couldn’t be loaded due to requiring a newer Jenkins version.

3

Since it’s a sandbox environment we don’t have any jobs, we performed the rollback by provisioning a new instance with the AMI that we were using before. After that we got this error in the login page.

4

but what did you do with your JENKINS_HOME? Did you also reset this?