Erreur de plugin métrique Jenkins et Ruby

Question

J'exécute Jenkins 1.424.2 pour une application Ruby on Rails et je souhaite utiliser le plugin de métriques Ruby. Je l'ai installé à l'aide du site Gérer les plugins. Mais lorsque je redémarre Jenkins, le plugin n'est pas disponible aux options de configuration d'un travail.

Donc, j'ai jeté un aperçu des fichiers de journal, et il s'est avéré que le plugin ne pouvait pas être démarré. D'abord quelques erreurs avec une dépendance Maven-Plugin, puis cette erreur

SEVERE: Failed Initializing plugin rubyMetrics
java.lang.NullPointerException

Voici toute la sortie du fichier de journaux:

...
Running from: /usr/share/jenkins/jenkins.war
[Winstone 2012/02/23 16:53:57] - Beginning extraction from war file
Jenkins home directory: /var/lib/jenkins found at: EnvVars.masterEnvVars.get("JENKINS_HOME")
[Winstone 2012/02/23 16:53:59] - HTTP Listener started: port=8080
[Winstone 2012/02/23 16:53:59] - Winstone Servlet Engine v0.9.10 running: controlPort=disabled
Feb 23, 2012 4:53:59 PM jenkins.model.Jenkins$6 onAttained
INFO: Started initialization
Feb 23, 2012 4:54:00 PM jenkins.model.Jenkins$6 onAttained
INFO: Listed all plugins
Feb 23, 2012 4:54:00 PM jenkins.model.Jenkins$6 onTaskFailed
SEVERE: Failed Loading plugin rubyMetrics
java.io.IOException: Dependency maven-plugin (1.397) doesn't exist
    at hudson.PluginWrapper.resolvePluginDependencies(PluginWrapper.java:424)
    at hudson.PluginManager$2$1$1.run(PluginManager.java:284)
    at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
    at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
    at jenkins.model.Jenkins$5.runTask(Jenkins.java:797)
    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(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:679)
Feb 23, 2012 4:54:00 PM hudson.plugins.ansicolor.PluginImpl start
INFO: starting ansicolor plugin (https://github.com/dblock/jenkins-ansicolor-plugin)
Feb 23, 2012 4:54:00 PM jenkins.model.Jenkins$6 onAttained
INFO: Prepared all plugins
Feb 23, 2012 4:54:00 PM jenkins.model.Jenkins$6 onTaskFailed
SEVERE: Failed Initializing plugin rubyMetrics
java.lang.NullPointerException
    at hudson.PluginManager$2$1$2.run(PluginManager.java:301)
    at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
    at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
    at jenkins.model.Jenkins$5.runTask(Jenkins.java:797)
    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(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:679)
Feb 23, 2012 4:54:00 PM jenkins.model.Jenkins$6 onAttained
INFO: Started all plugins
null
Feb 23, 2012 4:54:00 PM jenkins.model.Jenkins$6 onAttained
INFO: Augmented all extensions
hudson.util.IOException2: Unable to read /var/lib/jenkins/jobs/Raffler/builds/2012-02-23_16-28-13/build.xml
    at hudson.XmlFile.unmarshal(XmlFile.java:155)
    at hudson.model.Run.reload(Run.java:283)
    at hudson.model.Run.<init>(Run.java:272)
    at hudson.model.AbstractBuild.<init>(AbstractBuild.java:159)
    at hudson.model.Build.<init>(Build.java:100)
    at hudson.model.FreeStyleBuild.<init>(FreeStyleBuild.java:41)
    at sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
    at hudson.model.AbstractProject.loadBuild(AbstractProject.java:947)
    at hudson.model.AbstractProject$1.create(AbstractProject.java:256)
    at hudson.model.AbstractProject$1.create(AbstractProject.java:254)
    at hudson.model.RunMap.load(RunMap.java:221)
    at hudson.model.AbstractProject.onLoad(AbstractProject.java:254)
    at hudson.model.Project.onLoad(Project.java:88)
    at hudson.model.Items.load(Items.java:115)
    at jenkins.model.Jenkins$14.run(Jenkins.java:2273)
    at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
    at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
    at jenkins.model.Jenkins$5.runTask(Jenkins.java:797)
    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(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:679)
Caused by: com.thoughtworks.xstream.io.StreamException:  : input contained no data
    at com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java:80)
    at com.thoughtworks.xstream.io.xml.AbstractPullReader.readRealEvent(AbstractPullReader.java:154)
    at com.thoughtworks.xstream.io.xml.AbstractPullReader.readEvent(AbstractPullReader.java:147)
    at com.thoughtworks.xstream.io.xml.AbstractPullReader.move(AbstractPullReader.java:126)
    at com.thoughtworks.xstream.io.xml.AbstractPullReader.moveDown(AbstractPullReader.java:111)
    at com.thoughtworks.xstream.io.xml.XppReader.<init>(XppReader.java:48)
    at com.thoughtworks.xstream.io.xml.XppDriver.createReader(XppDriver.java:44)
    at com.thoughtworks.xstream.io.xml.XppDriver.createReader(XppDriver.java:49)
    at hudson.XmlFile.unmarshal(XmlFile.java:153)
    ... 24 more
Caused by: java.io.EOFException: input contained no data
    at org.xmlpull.mxp1.MXParser.fillBuf(MXParser.java:3003)
    at org.xmlpull.mxp1.MXParser.more(MXParser.java:3046)
    at org.xmlpull.mxp1.MXParser.parseProlog(MXParser.java:1410)
    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:63)
    ... 32 more
Feb 23, 2012 4:54:01 PM jenkins.model.Jenkins$6 onAttained
INFO: Loaded all jobs
Feb 23, 2012 4:54:01 PM jenkins.model.Jenkins$6 onAttained
INFO: Completed initialization
Feb 23, 2012 4:54:01 PM hudson.TcpSlaveAgentListener <init>
INFO: JNLP slave agent listener started on TCP port 52218
Feb 23, 2012 5:00:02 PM hudson.model.Run run
INFO: Raffler #29 main build action completed: SUCCESS
Feb 23, 2012 5:03:19 PM hudson.model.Run run
INFO: Raffler #30 main build action completed: SUCCESS
...

Est-ce un bug dans Jenkins ou dans le plugin? Comment puis-je le réparer?