CannotResolveClassException errors after upgrading to v1.480

[Thomas Fields]

Hi there,

I've just updated to Jenkins 1.480 (from 1.465) and one of my projects went missing. I recreated it but now when I tell it to build I get:

11:39:30 FATAL: html : html
11:39:30 com.thoughtworks.xstream.mapper.CannotResolveClassException: html : html
11:39:30 	at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:68)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:71)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:86)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:96)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:215)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:43)
11:39:30 	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:38)
11:39:30 	at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:56)
11:39:30 	at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29)
11:39:30 	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:136)
11:39:30 	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:33)
11:39:30 	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:926)
11:39:30 	at hudson.util.XStream2.unmarshal(XStream2.java:93)
11:39:30 	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:912)
11:39:30 	at hudson.XmlFile.unmarshal(XmlFile.java:160)
11:39:30 	at hudson.model.Run.reload(Run.java:291)
11:39:30 	at hudson.model.Run.<init>(Run.java:280)
11:39:30 	at hudson.model.AbstractBuild.<init>(AbstractBuild.java:166)
11:39:30 	at hudson.model.Build.<init>(Build.java:103)
11:39:30 	at hudson.matrix.MatrixRun.<init>(MatrixRun.java:58)
11:39:30 	at sun.reflect.GeneratedConstructorAccessor166.newInstance(Unknown Source)
11:39:30 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
11:39:30 	at java.lang.reflect.Constructor.newInstance(Unknown Source)
11:39:30 	at hudson.model.AbstractProject.loadBuild(AbstractProject.java:1009)
11:39:30 	at hudson.model.AbstractProject$1.create(AbstractProject.java:276)
11:39:30 	at hudson.model.AbstractProject$1.create(AbstractProject.java:274)
11:39:30 	at hudson.model.RunMap.load(RunMap.java:247)
11:39:30 	at hudson.model.AbstractProject.onLoad(AbstractProject.java:274)
11:39:30 	at hudson.model.Project.onLoad(Project.java:88)
11:39:30 	at hudson.matrix.MatrixConfiguration.onLoad(MatrixConfiguration.java:83)
11:39:30 	at hudson.matrix.MatrixProject.loadConfigurations(MatrixProject.java:541)
11:39:30 	at hudson.matrix.MatrixProject.loadConfigurations(MatrixProject.java:548)
11:39:30 	at hudson.matrix.MatrixProject.rebuildConfigurations(MatrixProject.java:585)
11:39:30 	at hudson.matrix.MatrixBuild$MatrixBuildExecution.doRun(MatrixBuild.java:330)
11:39:30 	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)
11:39:30 	at hudson.model.Run.execute(Run.java:1502)
11:39:30 	at hudson.matrix.MatrixBuild.run(MatrixBuild.java:289)
11:39:30 	at hudson.model.ResourceController.execute(ResourceController.java:88)
11:39:30 	at hudson.model.Executor.run(Executor.java:236)
11:39:30 	at hudson.model.OneOffExecutor.run(OneOffExecutor.java:66)

Any ideas what the problem is? The closest issue I can find that matches that callstack is https://issues.jenkins-ci.org/browse/JENKINS-11706 but that's nearly a year old.

Cheers,
Tom.