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Type: Bug
Resolution: Fixed
Priority: Critical
Component/s: core, ec2-plugin
Labels:
- 2.235.1-fixed
Environment:
Jenkins 2.235, EC2 1.50 > EC2 1.49

Similar Issues:

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If you downgrade from a recent version of ec2-plugin with the security fixes: 1.50.2 or 1.49.2 or 1.46.3 to the previous installed version after you disabled the Administrative Monitor which show the message about weak strategies used (clicking on Dismiss these messages):

the previous ec2-plugin version doesn't initialize correctly and the cloud configuration is lost. The nodes configurations are still there, but they cannot be used as the plugin didn't start.

The log printed out:

2020-05-10 11:12:03.789+0000 [id=33]    INFO    jenkins.InitReactorRunner$1#onAttained: Listed all plugins
2020-05-10 11:12:04.301+0000 [id=30]    SEVERE  jenkins.InitReactorRunner$1#onTaskFailed: Failed Loading plugin Amazon EC2 plugin v1.49.1 (ec2)
java.lang.IllegalStateException: Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0
        at hudson.ExtensionList.lookupSingleton(ExtensionList.java:451)
        at hudson.diagnosis.OldDataMonitor.get(OldDataMonitor.java:91)
        at hudson.diagnosis.OldDataMonitor.report(OldDataMonitor.java:223)
        at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:368)
        at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:267)
        at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
Caused: com.thoughtworks.xstream.converters.ConversionException: Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0 : Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0
---- Debugging information ----
message             : Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0
cause-exception     : java.lang.IllegalStateException
cause-message       : Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0
class               : hudson.plugins.ec2.PluginImpl
required-type       : hudson.plugins.ec2.PluginImpl
converter-type      : hudson.util.RobustReflectionConverter
path                : /hudson.plugins.ec2.PluginImpl
line number         : 4
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:1189)
        at hudson.util.XStream2.unmarshal(XStream2.java:161)
        at hudson.util.XStream2.unmarshal(XStream2.java:132)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)
        at hudson.XmlFile.unmarshal(XmlFile.java:180)
Caused: java.io.IOException: Unable to read /home/rleon/develop/projects/ec2-plugin/jenkins-home-of-jenkins-2.235.war(8080)/ec2.xml
        at hudson.XmlFile.unmarshal(XmlFile.java:183)
        at hudson.XmlFile.unmarshal(XmlFile.java:163)
        at hudson.Plugin.load(Plugin.java:270)
        at hudson.plugins.ec2.PluginImpl.start(PluginImpl.java:46)
        at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:403)
        at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:392)
Caused: java.io.IOException: Failed to initialize
        at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:395)
        at hudson.PluginManager$2$1$1.run(PluginManager.java:549)
        at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:296)
        at jenkins.model.Jenkins$5.runTask(Jenkins.java:1131)
        at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214)
        at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
        at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
2020-05-10 11:12:06.202+0000 [id=30]    INFO    jenkins.InitReactorRunner$1#onAttained: Prepared all plugins
2020-05-10 11:12:06.207+0000 [id=36]    INFO    jenkins.InitReactorRunner$1#onAttained: Started all plugins
2020-05-10 11:12:06.209+0000 [id=41]    INFO    jenkins.InitReactorRunner$1#onAttained: Augmented all extensions
2020-05-10 11:12:06.660+0000 [id=41]    WARNING jenkins.model.Nodes#load: could not load /home/rleon/develop/projects/ec2-plugin/jenkins-home-of-jenkins-2.235.war(8080)/nodes/EC2 (ec2) - linux (i-077e7393c9fb5fea5)-BACKUP
com.thoughtworks.xstream.mapper.CannotResolveClassException: hudson.plugins.ec2.EC2OndemandSlave
        at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:79)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:379)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:43)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:48)
        at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29)
        at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:133)
        at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1189)
        at hudson.util.XStream2.unmarshal(XStream2.java:161)
        at hudson.util.XStream2.unmarshal(XStream2.java:132)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)
        at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1053)
        at hudson.XmlFile.read(XmlFile.java:149)
Caused: java.io.IOException: Unable to read /home/rleon/develop/projects/ec2-plugin/jenkins-home-of-jenkins-2.235.war(8080)/nodes/EC2 (ec2) - linux (i-077e7393c9fb5fea5)-BACKUP/config.xml
        at hudson.XmlFile.read(XmlFile.java:151)
        at jenkins.model.Nodes.load(Nodes.java:338)
        at jenkins.model.Jenkins$13.run(Jenkins.java:3254)
        at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:296)
        at jenkins.model.Jenkins$5.runTask(Jenkins.java:1131)
        at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214)
        at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
        at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
2020-05-10 11:12:06.661+0000 [id=41]    WARNING jenkins.model.Nodes#load: could not load /home/rleon/develop/projects/ec2-plugin/jenkins-home-of-jenkins-2.235.war(8080)/nodes/EC2 (ec2) - linux (i-077e7393c9fb5fea5)
com.thoughtworks.xstream.mapper.CannotResolveClassException: hudson.plugins.ec2.EC2OndemandSlave
        at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:79)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:379)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:43)
        at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:48)
        at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29)
        at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:133)
        at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1189)
        at hudson.util.XStream2.unmarshal(XStream2.java:161)
        at hudson.util.XStream2.unmarshal(XStream2.java:132)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)
        at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1053)
        at hudson.XmlFile.read(XmlFile.java:149)
Caused: java.io.IOException: Unable to read /home/rleon/develop/projects/ec2-plugin/jenkins-home-of-jenkins-2.235.war(8080)/nodes/EC2 (ec2) - linux (i-077e7393c9fb5fea5)/config.xml
        at hudson.XmlFile.read(XmlFile.java:151)
        at jenkins.model.Nodes.load(Nodes.java:338)
        at jenkins.model.Jenkins$13.run(Jenkins.java:3254)
        at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:296)
        at jenkins.model.Jenkins$5.runTask(Jenkins.java:1131)
        at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214)
        at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
        at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
2020-05-10 11:12:06.672+0000 [id=38]    INFO    jenkins.InitReactorRunner$1#onAttained: System config loaded

If you remove the JENKINS_HOME/ec2.xml file created when you dismissed the specific messages, Jenkins will start correctly. But if you start it before doing this, your cloud configuration will go away.

Steps to Reproduce

Start Jenkins 2.235 without any plugin installation
Install ec2-plugin 1.49.1 or any other version without the security fixes (! 1.50.2, 1.49.2, 1.46.3)
Configure some cloud and template
Update ec2-plugin to 1.50.2
Click on Dismiss these messages of the Administrative Monitor. The ec2.xml file is created.
Downgrade ec2-plugin to the previous one via pluginManager. Or any other way I believe (although not tested)
Restart Jenkins
Jenkins starts, the commented warning is printed in the log, the cloud configuration is not there.
If you now delete the ec2.xml file, it's too late.