Cannot create a slave node : Failed to instantiate class hudson.slaves.DumbSlave

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Kamal Ahmed

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Jul 15, 2016, 10:41:55 PM7/15/16
to Jenkins Users
Jenkins: Jenkins ver. 1.651.2
trying to create a Dumb Node:

i get the following error: Here is the stack trace:

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Stack trace
javax.servlet.ServletException: java.lang.RuntimeException: Failed to instantiate class hudson.slaves.DumbSlave from {"name":"70GiB","nodeDescription":"","numExecutors":"1","remoteFS":"/home/jenkins","labelString":"70GiB","mode":"EXCLUSIVE","":["hudson.plugins.sshslaves.SSHLauncher","hudson.slaves.RetentionStrategy$Always"],"launcher":{"stapler-class":"hudson.plugins.sshslaves.SSHLauncher","$class":"hudson.plugins.sshslaves.SSHLauncher","host":"10.103.135.18","credentialsId":"99abf90a-55c1-4bc8-b131-903994567777","port":"22","javaPath":"","jvmOptions":"","prefixStartSlaveCmd":"","suffixStartSlaveCmd":"","launchTimeoutSeconds":"","maxNumRetries":"","retryWaitTime":""},"retentionStrategy":{"stapler-class":"hudson.slaves.RetentionStrategy$Always","$class":"hudson.slaves.RetentionStrategy$Always"},"nodeProperties":{"stapler-class-bag":"true"},"type":"hudson.slaves.DumbSlave"}
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
    at org.kohsuke.stapler.MetaClass$3.doDispatch(MetaClass.java:196)
    at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
    at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)
    at com.smartcodeltd.jenkinsci.plugin.assetbundler.filters.LessCSS.doFilter(LessCSS.java:47)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
    at hudson.plugins.audit_trail.AuditTrailFilter.doFilter(AuditTrailFilter.java:95)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
    at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:201)
    at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:178)
    at net.bull.javamelody.PluginMonitoringFilter.doFilter(PluginMonitoringFilter.java:85)
    at org.jvnet.hudson.plugins.monitoring.HudsonMonitoringFilter.doFilter(HudsonMonitoringFilter.java:102)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
    at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:126)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:49)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
    at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
    at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
    at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
    at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
    at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
    at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
    at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
    at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
    at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
    at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: Failed to instantiate class hudson.slaves.DumbSlave from {"name":"70GiB","nodeDescription":"","numExecutors":"1","remoteFS":"/home/jenkins","labelString":"70GiB","mode":"EXCLUSIVE","":["hudson.plugins.sshslaves.SSHLauncher","hudson.slaves.RetentionStrategy$Always"],"launcher":{"stapler-class":"hudson.plugins.sshslaves.SSHLauncher","$class":"hudson.plugins.sshslaves.SSHLauncher","host":"10.103.135.18","credentialsId":"99abf90a-55c1-4bc8-b131-903994567777","port":"22","javaPath":"","jvmOptions":"","prefixStartSlaveCmd":"","suffixStartSlaveCmd":"","launchTimeoutSeconds":"","maxNumRetries":"","retryWaitTime":""},"retentionStrategy":{"stapler-class":"hudson.slaves.RetentionStrategy$Always","$class":"hudson.slaves.RetentionStrategy$Always"},"nodeProperties":{"stapler-class-bag":"true"},"type":"hudson.slaves.DumbSlave"}
    at hudson.model.Descriptor.newInstance(Descriptor.java:600)
    at hudson.model.ComputerSet.doDoCreateItem(ComputerSet.java:295)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:320)
    at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:163)
    at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
    at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:124)
    at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
    ... 69 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.model.Node#temporaryOfflineCause for class hudson.slaves.DumbSlave
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:215)
    at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:183)
    at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
    at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:168)
    at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:109)
    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:1026)
    at com.thoughtworks.xstream.XStream.marshal(XStream.java:1015)
    at com.thoughtworks.xstream.XStream.toXML(XStream.java:988)
    at hudson.XmlFile.write(XmlFile.java:178)
    at jenkins.model.Nodes.save(Nodes.java:245)
    at hudson.util.PersistedList.onModified(PersistedList.java:173)
    at hudson.util.PersistedList.replaceBy(PersistedList.java:85)
    at hudson.model.Slave.<init>(Slave.java:172)
    at hudson.model.Slave.<init>(Slave.java:148)
    at hudson.slaves.DumbSlave.<init>(DumbSlave.java:54)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:523)
    at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:775)
    at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:81)
    at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:672)
    at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:476)
    at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:472)
    at hudson.model.Descriptor.newInstance(Descriptor.java:588)
    ... 80 more
Caused by: java.lang.RuntimeException: Failed to serialize OfflineCause_groovyProxy#closureMap for class OfflineCause_groovyProxy
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:215)
    at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:183)
    at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
    at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:168)
    at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:109)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:224)
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:211)
    ... 110 more
Caused by: java.lang.RuntimeException: Failed to serialize groovy.lang.Closure#delegate for class Script1$_run_closure9
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:215)
    at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:183)
    at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
    at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:168)
    at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:109)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:88)
    at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
    at com.thoughtworks.xstream.converters.collections.MapConverter.marshal(MapConverter.java:79)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:224)
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:211)
    ... 119 more
Caused by: java.lang.RuntimeException: Failed to serialize groovy.lang.Script#binding for class Script1
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:215)
    at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:183)
    at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
    at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:168)
    at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:109)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:224)
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:211)
    ... 134 more
Caused by: java.lang.RuntimeException: Failed to serialize groovy.lang.Binding#variables for class groovy.lang.Binding
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:215)
    at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:183)
    at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
    at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:168)
    at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:109)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:224)
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:211)
    ... 143 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.Launcher#listener for class hudson.Launcher$LocalLauncher
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:215)
    at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:183)
    at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
    at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:168)
    at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:109)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:88)
    at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
    at com.thoughtworks.xstream.converters.collections.MapConverter.marshal(MapConverter.java:79)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:224)
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:211)
    ... 152 more
Caused by: com.thoughtworks.xstream.converters.ConversionException: Could not call hudson.model.StreamBuildListener.writeObject() : Could not call hudson.remoting.RemoteOutputStream.writeObject() : null
---- Debugging information ----
message             : Could not call hudson.remoting.RemoteOutputStream.writeObject()
cause-exception     : java.lang.NullPointerException
cause-message       : null
-------------------------------
message             : Could not call hudson.model.StreamBuildListener.writeObject()
cause-exception     : com.thoughtworks.xstream.converters.ConversionException
cause-message       : Could not call hudson.remoting.RemoteOutputStream.writeObject() : null
-------------------------------
    at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteObject(SerializationMethodInvoker.java:141)
    at com.thoughtworks.xstream.converters.reflection.SerializableConverter.doMarshal(SerializableConverter.java:259)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:83)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
    at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:224)
    at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:211)
    ... 167 more
Caused by: com.thoughtworks.xstream.converters.ConversionException: Could not call hudson.remoting.RemoteOutputStream.writeObject() : null
---- Debugging information ----
message             : Could not call hudson.remoting.RemoteOutputStream.writeObject()
cause-exception     : java.lang.NullPointerException
cause-message       : null
-------------------------------
    at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteObject(SerializationMethodInvoker.java:141)
    at com.thoughtworks.xstream.converters.reflection.SerializableConverter.doMarshal(SerializableConverter.java:259)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:83)
    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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:88)
    at com.thoughtworks.xstream.converters.reflection.SerializableConverter$1.writeToStream(SerializableConverter.java:140)
    at com.thoughtworks.xstream.core.util.CustomObjectOutputStream.writeObjectOverride(CustomObjectOutputStream.java:84)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:343)
    at hudson.util.StreamTaskListener.writeObject(StreamTaskListener.java:178)
    at sun.reflect.GeneratedMethodAccessor1710.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteObject(SerializationMethodInvoker.java:135)
    ... 174 more
Caused by: java.lang.NullPointerException
    at hudson.remoting.RemoteOutputStream.writeObject(RemoteOutputStream.java:82)
    at sun.reflect.GeneratedMethodAccessor1619.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteObject(SerializationMethodInvoker.java:135)
    ... 188 more

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