Error message while building Jenkins

[Christoph Kutzinski]

Has someone else noticed these error messages? Looks like a failure to do some Guice injection during tests, but no tests fail. So, I'm not sure if it's a problem or not. Anyway, these messages look disturbing.
E.g.
http://ci.jenkins-ci.org/view/Jenkins%20core/job/jenkins_main_trunk/1515/consoleFull

Feb 2, 2012 9:52:52 PM com.google.inject.internal.MessageProcessor visit
INFO: An exception was caught and reported. Message: java.lang.NullPointerException
java.lang.NullPointerException
	at org.jvnet.hudson.test.TestExtensionLoader.isActive(TestExtensionLoader.java:61)
	at hudson.ExtensionFinder$AbstractGuiceFinder$SezpozModule.configure(ExtensionFinder.java:425)
	at com.google.inject.AbstractModule.configure(AbstractModule.java:62)
	at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:229)
	at com.google.inject.spi.Elements.getElements(Elements.java:103)
	at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:136)
	at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:104)
	at com.google.inject.Guice.createInjector(Guice.java:94)
	at com.google.inject.Guice.createInjector(Guice.java:71)
	at hudson.ExtensionFinder$AbstractGuiceFinder.<init>(ExtensionFinder.java:243)
	at org.jvnet.hudson.test.TestExtensionLoader.<init>(TestExtensionLoader.java:41)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at java.lang.Class.newInstance0(Class.java:355)
	at java.lang.Class.newInstance(Class.java:308)
	at net.java.sezpoz.IndexItem.instance(IndexItem.java:181)
	at hudson.ExtensionFinder$Sezpoz._find(ExtensionFinder.java:561)
	at hudson.ExtensionFinder$Sezpoz.find(ExtensionFinder.java:536)
	at hudson.ExtensionFinder._find(ExtensionFinder.java:147)
	at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:289)
	at hudson.ExtensionList.load(ExtensionList.java:278)
	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:231)
	at hudson.ExtensionList.iterator(ExtensionList.java:138)
	at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:282)
	at hudson.ExtensionList.load(ExtensionList.java:278)
	at hudson.ExtensionList.ensureLoaded(ExtensionList.java:231)
	at hudson.ExtensionList.iterator(ExtensionList.java:138)
	at hudson.ExtensionList.get(ExtensionList.java:129)
	at hudson.diagnosis.NullIdDescriptorMonitor.verifyId(NullIdDescriptorMonitor.java:86)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at hudson.init.InitializerFinder.invoke(InitializerFinder.java:120)
	at hudson.init.InitializerFinder$TaskImpl.run(InitializerFinder.java:184)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
	at jenkins.model.Jenkins$5.runTask(Jenkins.java:812)
	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$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
Feb 2, 2012 9:52:52 PM hudson.ExtensionFinder$AbstractGuiceFinder <init>
SEVERE: Failed to create Guice container from all the plugins
com.google.inject.CreationException: Guice creation errors:

1) An exception was caught and reported. Message: null
  at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:136)

1 error
	at com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:437)
	at com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:155)
	at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:107)
	at com.google.inject.Guice.createInjector(Guice.java:94)