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java.lang.NullPointerException: 	at hudson.remoting.RemoteOutputStream.writeObject(RemoteOutputStream.java:82)	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 com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteObject(SerializationMethodInvoker.java:135)	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:161)	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 com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteObject(SerializationMethodInvoker.java:135)	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:223)	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:210)	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:182)	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:167)	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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:223)	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:210)	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:182)	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:167)	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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:88)	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)	at hudson.util.DescribableList$ConverterImpl.marshal(DescribableList.java:259)	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:223)	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:210)	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:182)	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:167)	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:108)	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:43)	at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:82)	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:37)	at com.thoughtworks.xstream.XStream.marshal(XStream.java:1026)	at com.thoughtworks.xstream.XStream.marshal(XStream.java:1015)	at com.thoughtworks.xstream.XStream.toXML(XStream.java:988)	at hudson.XmlFile.write(XmlFile.java:178)	at hudson.model.AbstractItem.save(AbstractItem.java:461)	at hudson.model.Job.save(Job.java:166)	at hudson.model.AbstractProject.save(AbstractProject.java:303)	at hudson.model.AbstractItem.setDisplayName(AbstractItem.java:160)	at hudson.model.Job.doConfigSubmit(Job.java:1139)	at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:773)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:120)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:728)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:858)	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:248)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:728)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:858)	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:248)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:728)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:858)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:631)	at org.kohsuke.stapler.Stapler.service(Stapler.java:225)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)	at hudson.plugins.audit_trail.AuditTrailFilter.doFilter(AuditTrailFilter.java:89)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:99)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	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 org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:174)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)	at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:74)	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$1.doFilter(ChainedServletFilter.java:87)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:68)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.Server.handle(Server.java:370)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)	at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)	at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:744)