If a slave jlnp connection is broken (to a Windows host?), it looks like the offlineCause element is not computed correctly.

Accessing jenkins/computer/xxx/api/json works fine, but jenkins/computer/qual-a/api/json?depth=2 fails with a 500 error:

{ "actions" : [ ], "displayName" : "xxx", "executors" : [

{ "currentExecutable" : null, "currentWorkUnit" : null, "idle" : true, "likelyStuck" : false, "number" : 0, "progress" : -1 }

], "icon" : "computer-x.png", "idle" : true, "jnlpAgent" : true, "launchSupported" : false, "loadStatistics" : { "busyExecutors" : { "hour" : { }, "min" : { }, "sec10" : { } }, "queueLength" : { "hour" : { }, "min" : { }, "sec10" : { } }, "totalExecutors" : { "hour" : { }, "min" : { }, "sec10" : { } } }, "manualLaunchAllowed" : true, "monitorData" :

{ "hudson.node_monitors.SwapSpaceMonitor" : null, "hudson.node_monitors.ArchitectureMonitor" : null, "hudson.node_monitors.ResponseTimeMonitor" : null, "hudson.node_monitors.TemporarySpaceMonitor" : null, "hudson.node_monitors.DiskSpaceMonitor" : null, "hudson.node_monitors.ClockMonitor" : null }

, "numExecutors" : 1, "offline" : true, "offlineCause" : { "cause" : {
Status Code: 500

Exception: org.kohsuke.stapler.export.NotExportableException: class java.net.SocketException doesn't have @ExportedBean
Stacktrace:
javax.servlet.ServletException: org.kohsuke.stapler.export.NotExportableException: class java.net.SocketException doesn't have @ExportedBean
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:615)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:203)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:384)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:203)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:487)
at org.kohsuke.stapler.Stapler.service(Stapler.java:164)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
at winstone.ServletConfiguration.execute(ServletConfiguration.java:248)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:376)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
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 org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:124)
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:64)
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:66)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:331)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:227)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
at java.util.concurrent.Executors$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 winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: org.kohsuke.stapler.export.NotExportableException: class java.net.SocketException doesn't have @ExportedBean
at org.kohsuke.stapler.export.Model.<init>(Model.java:71)
at org.kohsuke.stapler.export.ModelBuilder.get(ModelBuilder.java:48)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:225)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:137)
at org.kohsuke.stapler.export.Property.writeTo(Property.java:114)
at org.kohsuke.stapler.export.Model.writeNestedObjectTo(Model.java:187)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:232)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:137)
at org.kohsuke.stapler.export.Property.writeTo(Property.java:114)
at org.kohsuke.stapler.export.Model.writeNestedObjectTo(Model.java:187)
at org.kohsuke.stapler.export.Model.writeNestedObjectTo(Model.java:182)
at org.kohsuke.stapler.export.Model.writeTo(Model.java:154)
at org.kohsuke.stapler.ResponseImpl.serveExposedBean(ResponseImpl.java:222)
at hudson.model.Api.doJson(Api.java:193)
at sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)
... 63 more

Generated by Stapler at Fri Mar 15 10:28:16 EDT 2013