Hi, after we've upgraded to 1.501 (from 1.471) all nodes die after some time and the logs show the following exception:
Feb 14, 2013 8:47:47 AM hudson.triggers.SafeTimerTask run > SEVERE: Timer task hudson.model.Queue$MaintainTask@4c4db085 failed > com.thoughtworks.xstream.mapper.CannotResolveClassException: FindBugsFilter : > FindBugsFilter > at > com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:68) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:71) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:86) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:96) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:231) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:43) > at > com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38) > at > com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:56) > at > com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29) > at > com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:136) > at > com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:33) > at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:926) > at hudson.util.XStream2.unmarshal(XStream2.java:104) > at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:912) > at hudson.XmlFile.unmarshal(XmlFile.java:160) > at hudson.model.Run.reload(Run.java:308) > at hudson.model.Run.<init>(Run.java:297) > at hudson.model.AbstractBuild.<init>(AbstractBuild.java:179) > at hudson.model.Build.<init>(Build.java:103) > at hudson.model.FreeStyleBuild.<init>(FreeStyleBuild.java:41) > at sun.reflect.GeneratedConstructorAccessor44.newInstance(Unknown > Source) > at > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) > at java.lang.reflect.Constructor.newInstance(Constructor.java:513) > at hudson.model.AbstractProject.loadBuild(AbstractProject.java:1084) > at hudson.model.AbstractProject$1.create(AbstractProject.java:282) > at hudson.model.AbstractProject$1.create(AbstractProject.java:280) > at hudson.model.RunMap.retrieve(RunMap.java:225) > at hudson.model.RunMap.retrieve(RunMap.java:59) > at > jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:645) > at > jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:608) > at > jenkins.model.lazy.AbstractLazyLoadRunMap.search(AbstractLazyLoadRunMap.java:347) > at > jenkins.model.lazy.AbstractLazyLoadRunMap.getByNumber(AbstractLazyLoadRunMap.java:505) > at > jenkins.model.lazy.AbstractLazyLoadRunMap.search(AbstractLazyLoadRunMap.java:358) > at hudson.model.AbstractBuild.getPreviousBuild(AbstractBuild.java:213) > at hudson.model.AbstractBuild.getPreviousBuild(AbstractBuild.java:100) > at hudson.model.Job.getLastBuildsOverThreshold(Job.java:856) > at hudson.model.Job.getEstimatedDuration(Job.java:863) > at hudson.model.queue.MappingWorksheet.<init>(MappingWorksheet.java:320) > at hudson.model.queue.MappingWorksheet.<init>(MappingWorksheet.java:303) > at hudson.model.Queue.maintain(Queue.java:1033) > at hudson.model.Queue.pop(Queue.java:861) > at hudson.model.Executor.grabJob(Executor.java:284) > at hudson.model.Executor.run(Executor.java:205) > > Any ideas? 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