Jenkins启动报错解决

误更新Jenkins权限管理插件，导致Jenkins重启直接报错！

报错内容如下(有部分删减)：

com.thoughtworks.xstream.mapper.CannotResolveClassException: com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy
  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)
  ......
Caused: jenkins.util.xstream.CriticalXStreamException: com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy : com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy
---- Debugging information ----
message             : com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy
cause-exception     : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message       : com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy
class               : hudson.model.Hudson
required-type       : hudson.model.Hudson
converter-type      : hudson.util.RobustReflectionConverter
path                : /hudson/authorizationStrategy
line number         : 9
version             : not available
-------------------------------
  ......
  at hudson.util.XStream2.unmarshal(XStream2.java:162)
  at hudson.util.XStream2.unmarshal(XStream2.java:133)
  at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)
  at hudson.XmlFile.unmarshal(XmlFile.java:180)
Caused: java.io.IOException: Unable to read C:\Users\Administrator\.jenkins\config.xml
  at hudson.XmlFile.unmarshal(XmlFile.java:183)
  at hudson.XmlFile.unmarshal(XmlFile.java:163)
  ......
Caused: org.jvnet.hudson.reactor.ReactorException
  at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:282)
  at jenkins.InitReactorRunner.run(InitReactorRunner.java:48)
  ......
Caused: hudson.util.HudsonFailedToLoad
  at hudson.WebAppMain$3.run(WebAppMain.java:250)

解决方案

（此处省略一万字的因为Jenkins启动失败导致的心理活动描写）内心平静下后，仔细观察报错内容，进行分析：

1. CannotResolveClassException: 无法对这个类com.michelin.cio.hudson.plugins.rolestrategy.RoleBasedAuthorizationStrategy做正确的处理
2. CriticalXStreamException: XStream？？ 这是在解析什么？？ 解析文件？？
3. Unable to read C:\Users\Administrator\.jenkins\config.xml： XStream在解析[config.xml]时遇到了无法处理的类[RoleBasedAuthorizationStrategy]

此时你可能不会想到一个问题，就是config.xml里面有什么内容？不好意思，我就打开了这个文件观察了一下，结果恍然大悟。

config.xml文件的内容是下面这个样子的，你有没有发现什么呢？