[JENKINS-22326] Calling into foreign code from a toString method, like Queue.Item.getWhy → QueueTaskDispatcher, is unsafe.

Javadoc for Queue.Task claimed they were compared using .equals(), but in critical cases this was not actually true.
Does not matter for the common case of Job, but when implementing custom tasks this could cause duplicate queue items (and executables).

[FIXES JENKINS-19622] Replace hudson.model.Trigger#timer with jenkins.util.Timer, which exposes a ScheduledExecutorService. Up to 10 additional threads will be created to run pending tasks even if running tasks are blocked.

Also, move static initialization of timers to the classes which require them.

Turns out in the new executor on-demand code, queue maintenance happens so quickly that even when a job is submitted with delay 0,
it can still fail the test if the check happens when "new GregorianCalendar()" returns the same value as "top.timestamp".

I'm relaxing that check

Use our own queue

Added Queue.schedule2 to allow the caller to retrieve the existing item in the queue. AbstractProject.doBuild() changed the behavior a bit to reply 201 if the item was already found in the queue (instead of a new one created.)

Exposed the UI that sets the assigned label of matrix projects.
This deprecates the "Matrix tie parent" plugin.

This can track items as they go through the queue.

As Jesse pointed out, contextual information is often useful in authenticating the build, which means we need to take Queue.Item (initially AbstractBuild was the parameter, which provided the context, and I failed to accommodate that in transition to AbstractProject.)

To still allow Queue.Tasks to provide a meaningful value fallback to Queue.Task.getDefaultAuthentication() as opposed to hard code it to ACL.SYSTEM. This allow plugins like remote-terminal-access to supply a meaningful secure value without forcing a configuration change to the user.

This came from Alpha CSP guys during JUC Israel. The remote API needs to expose a better way of tracking a submitted task.

No need to call isLoggable if you are only calling simply getters and relying on toString later.

[FIXED JENKINS-7291] Permit flyweight tasks to run on master even when it has zero configured executors.

Always adding Computer for master as a fallback

The original proposed fix for JENKINS-7291 creates a Computer object
transitively. This seems unwise as it violates the design of Computer
as stated in the javadoc, and for example we can end up creating two
Computers for the master.

I think a better fix is to create a Computer for the master all the
time, even if there's no executors configured. The discrimination in
Queue.makeBuildable would ensure that such phantom Computer is only used
as a last resort (statistically speaking).

I've also tweaked executors.jelly a bit. I simplified it somewhat
based on the idea that "if there's only one computer to show, the
context is likely making it obvious".

(I must be missing the intricacy in the current code.)

Originally developed in a branch at
2c5b57fcc1f39ed39057254e802f4183db5aa0dc then squashed for clarity.

Require POST for various operations.
(cherry picked from commit 36c86243)

Conflicts:

	core/src/main/java/hudson/model/AbstractBuild.java

A botched startup (say by an error in InitializerFinder) can cause log to be filled with junk like:
Sep 20, 2012 1:10:50 PM hudson.ExtensionFinder$GuiceFinder instantiate
WARNING: Failed to load hudson.node_monitors.DiskSpaceMonitor
java.lang.InstantiationException: java.lang.ExceptionInInitializerError
	at net.java.sezpoz.IndexItem.instance(IndexItem.java:193)
	at hudson.ExtensionFinder$GuiceFinder.instantiate(ExtensionFinder.java:353)
	at hudson.ExtensionFinder$GuiceFinder.access$400(ExtensionFinder.java:232)
	at hudson.ExtensionFinder$GuiceFinder$SezpozModule$1.get(ExtensionFinder.java:509)
	at com.google.inject.internal.ProviderInternalFactory.provision(ProviderInternalFactory.java:84)
	at com.google.inject.internal.InternalFactoryToInitializableAdapter.provision(InternalFactoryToInitializableAdapter.java:52)
	at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:66)
	at com.google.inject.internal.InternalFactoryToInitializableAdapter.get(InternalFactoryToInitializableAdapter.java:45)
	at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46)
	at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1018)
	at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
	at com.google.inject.Scopes$1$1.get(Scopes.java:59)
	at hudson.ExtensionFinder$GuiceFinder$4$1.get(ExtensionFinder.java:420)
	at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:41)
	at com.google.inject.internal.InjectorImpl$3$1.call(InjectorImpl.java:965)
	at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1011)
	at com.google.inject.internal.InjectorImpl$3.get(InjectorImpl.java:961)
	at hudson.ExtensionFinder$GuiceFinder._find(ExtensionFinder.java:389)
	at hudson.ExtensionFinder$GuiceFinder.find(ExtensionFinder.java:380)
	at hudson.ExtensionFinder._find(ExtensionFinder.java:149)
	at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:289)
	at hudson.ExtensionList.load(ExtensionList.java:278)
	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:231)
	at hudson.ExtensionList.getComponents(ExtensionList.java:149)
	at hudson.DescriptorExtensionList.load(DescriptorExtensionList.java:182)
	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:231)
	at hudson.ExtensionList.size(ExtensionList.java:157)
	at java.util.AbstractCollection.isEmpty(AbstractCollection.java:86)
	at hudson.model.labels.LabelAtom.updateTransientActions(LabelAtom.java:107)
	at hudson.model.labels.LabelAtom.load(LabelAtom.java:189)
	at jenkins.model.Jenkins.getLabelAtom(Jenkins.java:1545)
	at jenkins.model.Jenkins.getSelfLabel(Jenkins.java:2422)
	at hudson.model.Node.getAssignedLabels(Node.java:240)
	at jenkins.model.Jenkins$17.run(Jenkins.java:2499)
	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
	at jenkins.model.Jenkins$7.runTask(Jenkins.java:875)
	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)
	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)
	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: java.lang.ExceptionInInitializerError
	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:601)
	at net.java.sezpoz.IndexItem.instance(IndexItem.java:183)
	... 41 more
Caused by: java.lang.NullPointerException
	at hudson.node_monitors.AbstractNodeMonitorDescriptor.schedule(AbstractNodeMonitorDescriptor.java:73)
	at hudson.node_monitors.AbstractNodeMonitorDescriptor.<init>(AbstractNodeMonitorDescriptor.java:58)
	at hudson.node_monitors.AbstractNodeMonitorDescriptor.<init>(AbstractNodeMonitorDescriptor.java:54)
	at hudson.node_monitors.DiskSpaceMonitorDescriptor.<init>(DiskSpaceMonitorDescriptor.java:49)
	at hudson.node_monitors.DiskSpaceMonitor$1.<init>(DiskSpaceMonitor.java:62)
	at hudson.node_monitors.DiskSpaceMonitor.<clinit>(DiskSpaceMonitor.java:62)
	... 46 more

From what I was told by Emanuele today in the office hours, this came up
during the Copenhagen hackathon.

Queue.BlockedItem is not static, and so if items include this type, it ends up trying to persist the whole Queue instance, which will never work.
Sample stack trace below:

java.lang.RuntimeException: Failed to serialize hudson.model.Queue$BlockedItem#this$0 for class hudson.model.Queue$BlockedItem
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.CollectionConverter.marshal(CollectionConverter.java:55)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:98)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:38)
	at com.thoughtworks.xstream.XStream.marshal(XStream.java:840)
	at com.thoughtworks.xstream.XStream.marshal(XStream.java:829)
	at com.thoughtworks.xstream.XStream.toXML(XStream.java:804)
	at hudson.XmlFile.write(XmlFile.java:173)
	at hudson.model.Queue.save(Queue.java:349)
	at jenkins.model.Jenkins.cleanUp(Jenkins.java:2575)
	at org.jvnet.hudson.test.HudsonTestCase.tearDown(HudsonTestCase.java:381)
	at junit.framework.TestCase.runBare(TestCase.java:140)
	at org.jvnet.hudson.test.HudsonTestCase.runBare(HudsonTestCase.java:286)
	at junit.framework.TestResult$1.protect(TestResult.java:110)
	at junit.framework.TestResult.runProtected(TestResult.java:128)
	at junit.framework.TestResult.run(TestResult.java:113)
	at junit.framework.TestCase.run(TestCase.java:124)
	at junit.framework.TestSuite.runTest(TestSuite.java:243)
	at junit.framework.TestSuite.run(TestSuite.java:238)
	at com.sun.maven.junit.LocalTestCaseRunner.runTests(LocalTestCaseRunner.java:142)
	at com.sun.maven.junit.LocalTestCaseRunner.runTestCase(LocalTestCaseRunner.java:62)
	at com.sun.maven.junit.LocalTestCaseRunner.runTestCase(LocalTestCaseRunner.java:58)
	at sun.reflect.GeneratedMethodAccessor352.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:274)
	at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:255)
	at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:215)
	at hudson.remoting.UserRequest.perform(UserRequest.java:118)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:270)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.RuntimeException: Failed to serialize hudson.model.Queue#parked for class hudson.model.Queue
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 47 more
Caused by: java.lang.RuntimeException: Failed to serialize java.lang.Thread#group for class hudson.model.Executor
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.MapConverter.marshal(MapConverter.java:57)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 55 more
Caused by: java.lang.RuntimeException: Failed to serialize java.lang.ThreadGroup#threads for class java.lang.ThreadGroup
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 68 more
Caused by: java.lang.RuntimeException: Failed to serialize java.lang.Thread#threadLocals for class hudson.remoting.Channel$ReaderThread
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.ArrayConverter.marshal(ArrayConverter.java:45)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 76 more
Caused by: java.lang.RuntimeException: Failed to serialize java.lang.ThreadLocal$ThreadLocalMap#table for class java.lang.ThreadLocal$ThreadLocalMap
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 89 more
Caused by: java.lang.RuntimeException: Failed to serialize java.lang.ThreadLocal$ThreadLocalMap$Entry#value for class java.lang.ThreadLocal$ThreadLocalMap$Entry
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.ArrayConverter.marshal(ArrayConverter.java:45)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 97 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.remoting.Channel#executor for class hudson.remoting.Channel
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 110 more
Caused by: java.lang.RuntimeException: Failed to serialize java.util.concurrent.ThreadPoolExecutor#workers for class java.util.concurrent.ThreadPoolExecutor
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 118 more
Caused by: java.lang.RuntimeException: Failed to serialize java.util.concurrent.ThreadPoolExecutor$Worker#thread for class java.util.concurrent.ThreadPoolExecutor$Worker
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.CollectionConverter.marshal(CollectionConverter.java:55)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 126 more
Caused by: java.lang.RuntimeException: Failed to serialize java.lang.Thread#threadLocals for class java.lang.Thread
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 139 more
Caused by: java.lang.RuntimeException: Failed to serialize java.lang.ThreadLocal$ThreadLocalMap#table for class java.lang.ThreadLocal$ThreadLocalMap
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 147 more
Caused by: java.lang.RuntimeException: Failed to serialize java.lang.ref.Reference#referent for class java.lang.ThreadLocal$ThreadLocalMap$Entry
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.ArrayConverter.marshal(ArrayConverter.java:45)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 155 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.internal.InjectorImpl$1#this$0 for class com.google.inject.internal.InjectorImpl$1
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 168 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.internal.InjectorImpl#state for class com.google.inject.internal.InjectorImpl
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 176 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.internal.InheritingState#explicitBindingsMutable for class com.google.inject.internal.InheritingState
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 184 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.internal.BindingImpl#internalFactory for class com.google.inject.internal.ProviderInstanceBindingImpl
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.MapConverter.marshal(MapConverter.java:58)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 192 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.internal.InternalFactoryToProviderAdapter#provider for class com.google.inject.internal.InternalFactoryToProviderAdapter
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 205 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.ExtensionFinder$GuiceFinder$4$1#val$base for class hudson.ExtensionFinder$GuiceFinder$4$1
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 213 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.Scopes$1$1#val$creator for class com.google.inject.Scopes$1$1
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 221 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.internal.ProviderToInternalFactoryAdapter#internalFactory for class com.google.inject.internal.ProviderToInternalFactoryAdapter
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 229 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.internal.InternalFactoryToInitializableAdapter#initializable for class com.google.inject.internal.InternalFactoryToInitializableAdapter
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 237 more
Caused by: java.lang.RuntimeException: Failed to serialize com.google.inject.internal.Initializables$1#val$instance for class com.google.inject.internal.Initializables$1
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 245 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.ExtensionFinder$GuiceFinder$SezpozModule$1#this$1 for class hudson.ExtensionFinder$GuiceFinder$SezpozModule$1
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 253 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.ExtensionFinder$GuiceFinder$SezpozModule#index for class hudson.ExtensionFinder$GuiceFinder$SezpozModule
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 261 more
Caused by: java.lang.RuntimeException: Failed to serialize net.java.sezpoz.IndexItem#instance for class net.java.sezpoz.IndexItem
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.CollectionConverter.marshal(CollectionConverter.java:55)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 269 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.node_monitors.AbstractNodeMonitorDescriptor#record for class hudson.node_monitors.ClockMonitor$1
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 282 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.node_monitors.AbstractNodeMonitorDescriptor$Record#data for class hudson.node_monitors.AbstractNodeMonitorDescriptor$Record
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 290 more
Caused by: java.lang.RuntimeException: Failed to serialize hudson.slaves.SlaveComputer#taskListener for class hudson.slaves.SlaveComputer
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
	at com.thoughtworks.xstream.converters.collections.MapConverter.marshal(MapConverter.java:57)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:176)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
	... 298 more

Until now, Jenkins.overallNodeProvisioner was tracking an inconsistent
pair of numbers. On one hand, it was tracking all the executors in the
system, but then it was also only tracking the # of free-roaming
label-unassigned jobs as the queue length.

So if all your slaves are set with Node.Mode.EXCLUSIVE and you have some
free-roaming jobs, then it'll never tickle NodePrivisioner.

In other words, the # of executors weren't reflecting the actual # of
executors that can execute what's counted as the queue length.

See the problem report at
https://groups.google.com/forum/?fromgroups#!topic/jenkinsci-dev/bUwGEgOwv4Q

To fix this, I introduced another LoadStatistics that only counts
the # of executors that can execute free-roaming jobs, and # of
free-roaming jobs as the queue length. In this way, two pairs of numbers
are consistent.

This now allows us to use overallLoadStatistics for really the entire
system, including all executors and the total queue length. This is
primarily for administrators to see the resource utilization, and it is
not useful for NodeProvisioner input because it's mixing too many
different things.

The semantics change in OverallLoadStatistics.queueLength allows us to
deprecate its totalQueueLength field.

Queue#maintain() was returning too soon