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java.lang.NullPointerException: 	at java.lang.Class.isAssignableFrom(Native Method)	at org.jenkinsci.jruby.JavaProxyConverter.canConvert(JavaProxyConverter.java:43)	at com.thoughtworks.xstream.core.DefaultConverterLookup.registerConverter(DefaultConverterLookup.java:72)	at com.thoughtworks.xstream.XStream.registerConverter(XStream.java:1294)	at com.thoughtworks.xstream.XStream.registerConverter(XStream.java:1289)	at org.jenkinsci.jruby.JRubyXStream.register(JRubyXStream.java:26)	at ruby.RubyRuntimePlugin.initRubyXStreams(RubyRuntimePlugin.java:46)	at ruby.RubyRuntimePlugin.start(RubyRuntimePlugin.java:28)	at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:378)	at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:367)	at hudson.PluginManager.dynamicLoad(PluginManager.java:429)	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1313)	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1116)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:104)	at java.lang.Thread.run(Thread.java:724)