title: hudson.util.HudsonFailedToLoad error in Jenkins
body: <p>I am getting below error when i am trying to access my Jenkins server,</p>
  
  <pre><code>hudson.util.HudsonFailedToLoad: org.jvnet.hudson.reactor.ReactorException: java.lang.Error: java.lang.reflect.InvocationTargetException
  at hudson.WebAppMain$3.run(WebAppMain.java:234)
  Caused by: org.jvnet.hudson.reactor.ReactorException: java.lang.Error: java.lang.reflect.InvocationTargetException
      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.&lt;init&gt;(Jenkins.java:809)
      at hudson.model.Hudson.&lt;init&gt;(Hudson.java:82)
      at hudson.model.Hudson.&lt;init&gt;(Hudson.java:78)
      at hudson.WebAppMain$3.run(WebAppMain.java:222)
  Caused by: java.lang.Error: java.lang.reflect.InvocationTargetException
      at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:109)
      at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.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(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at java.lang.Thread.run(Thread.java:745)
  Caused by: java.lang.reflect.InvocationTargetException
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:105)
      ... 8 more
  Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
      at com.thoughtworks.xstream.core.util.OrderRetainingMap.entrySet(OrderRetainingMap.java:77)
      at java.util.HashMap.putMapEntries(HashMap.java:511)
      at java.util.HashMap.putAll(HashMap.java:784)
      at com.thoughtworks.xstream.core.util.OrderRetainingMap.&lt;init&gt;(OrderRetainingMap.java:36)
      at com.thoughtworks.xstream.converters.reflection.FieldDictionary.buildMap(FieldDictionary.java:135)
      at com.thoughtworks.xstream.converters.reflection.FieldDictionary.fieldsFor(FieldDictionary.java:76)
      at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:127)
      at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:149)
      at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:108)
      at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)
      at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)
      at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:43)
      at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:82)
      at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:37)
      at com.thoughtworks.xstream.XStream.marshal(XStream.java:898)
      at com.thoughtworks.xstream.XStream.marshal(XStream.java:887)
      at com.thoughtworks.xstream.XStream.toXML(XStream.java:860)
      at hudson.XmlFile.write(XmlFile.java:178)
      at hudson.model.Descriptor.save(Descriptor.java:758)
      at hudson.plugins.git.GitTool.onLoaded(GitTool.java:108)
      ... 13 more
  </code></pre>
  
  <p>At the end of error file,i thought may be error related to Git tool. So i have also removed git-client plugin from /var/lib/jenkins/plugins. But after that it will show error unable to read <code>config.xml</code> file even though file is already there in /var/lib/jenkins/config.xml </p>
  
  <p>I need git-client plugin also. I don't know how to solve this problem.
  Please help if anyone know about this issue.
  Thanks</p>