Started by upstream project "project2" build number 383
FATAL: Failed to serialize hudson.model.Actionable#actions for class hudson.maven.MavenModuleSetBuild
java.lang.RuntimeException: Failed to serialize hudson.model.Actionable#actions for class hudson.maven.MavenModuleSetBuild
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:164)
	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.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:165)
	at org.jvnet.hudson.plugins.DownstreamBuildViewUpdateListener.save(DownstreamBuildViewUpdateListener.java:100)
	at org.jvnet.hudson.plugins.DownstreamBuildViewUpdateListener.onStarted(DownstreamBuildViewUpdateListener.java:88)
	at org.jvnet.hudson.plugins.DownstreamBuildViewUpdateListener.onStarted(DownstreamBuildViewUpdateListener.java:48)
	at hudson.model.listeners.RunListener.fireStarted(RunListener.java:139)
	at hudson.model.Run.run(Run.java:1236)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:306)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:122)
Caused by: java.lang.RuntimeException: Failed to serialize org.jvnet.hudson.plugins.AbstractDownstreamBuildViewAction#downstreamBuilds for class org.jvnet.hudson.plugins.DownstreamBuildViewAction
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:164)
	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 hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:172)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:160)
	... 21 more
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$EntryIterator.next(HashMap.java:834)
	at java.util.HashMap$EntryIterator.next(HashMap.java:832)
	at com.thoughtworks.xstream.converters.collections.MapConverter.marshal(MapConverter.java:54)
	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 hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:172)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:160)
	... 35 more