After a power failure a bunch of fingerprint files were corrupted and were just filled with 5kb of null chars. This caused any build that ran after to fail on the copyartifacts task. It should probably be made to handle parse exceptions.

As I understand it there is a fingerprint cleanup thread that runs periodically, can it be triggered manually? and will it remove fingerprint files that can't be parsed?

To fix the below error I just deleted all the corrupted files.

ERROR: Failed to copy artifacts from Workspace Processor with filter: install/**
hudson.util.IOException2: Failed to copy D:\jenkins\jobs\Workspace Processor\builds\2012-10-22_07-43-43\archive\install\Proxy\build.xml to D:\jenkins\jobs\Common\workspace\install\Proxy\build.xml
at hudson.plugins.copyartifact.FingerprintingCopyMethod.copyOne(FingerprintingCopyMethod.java:97)
at hudson.plugins.copyartifact.FingerprintingCopyMethod.copyAll(FingerprintingCopyMethod.java:64)
at hudson.plugins.copyartifact.CopyArtifact.perform(CopyArtifact.java:243)
at hudson.plugins.copyartifact.CopyArtifact.perform(CopyArtifact.java:215)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:807)
at hudson.model.Build$BuildExecution.build(Build.java:199)
at hudson.model.Build$BuildExecution.doRun(Build.java:160)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:589)
at hudson.model.Run.execute(Run.java:1516)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:236)
Caused by: hudson.util.IOException2: Unable to read D:\jenkins\fingerprints\0a\f0\9d4fd69dbb48671e2b504323d9b8.xml
at hudson.XmlFile.read(XmlFile.java:139)
at hudson.model.Fingerprint.load(Fingerprint.java:910)
at hudson.model.Fingerprint.load(Fingerprint.java:898)
at hudson.model.FingerprintMap.load(FingerprintMap.java:94)
at hudson.model.FingerprintMap.load(FingerprintMap.java:45)
at hudson.util.KeyedDataStorage.get(KeyedDataStorage.java:154)
at hudson.model.FingerprintMap.get(FingerprintMap.java:79)
at hudson.model.FingerprintMap.get(FingerprintMap.java:45)
at hudson.util.KeyedDataStorage.getOrCreate(KeyedDataStorage.java:108)
at hudson.model.FingerprintMap.getOrCreate(FingerprintMap.java:65)
at hudson.plugins.copyartifact.FingerprintingCopyMethod.copyOne(FingerprintingCopyMethod.java:90)
... 12 more
Caused by: com.thoughtworks.xstream.io.StreamException: : only whitespace content allowed before start tag and not \u0 (position: START_DOCUMENT seen \u0... @1:1)
at com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java:78)
at com.thoughtworks.xstream.io.xml.AbstractPullReader.readRealEvent(AbstractPullReader.java:154)
at com.thoughtworks.xstream.io.xml.AbstractPullReader.readEvent(AbstractPullReader.java:147)
at com.thoughtworks.xstream.io.xml.AbstractPullReader.move(AbstractPullReader.java:126)
at com.thoughtworks.xstream.io.xml.AbstractPullReader.moveDown(AbstractPullReader.java:111)
at com.thoughtworks.xstream.io.xml.XppReader.<init>(XppReader.java:48)
at com.thoughtworks.xstream.io.xml.XppDriver.createReader(XppDriver.java:44)
at com.thoughtworks.xstream.io.xml.XppDriver.createReader(XppDriver.java:49)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:864)
at hudson.XmlFile.read(XmlFile.java:137)
... 22 more
Caused by: org.xmlpull.v1.XmlPullParserException: only whitespace content allowed before start tag and not \u0 (position: START_DOCUMENT seen \u0... @1:1)
at org.xmlpull.mxp1.MXParser.parseProlog(MXParser.java:1519)
at org.xmlpull.mxp1.MXParser.nextImpl(MXParser.java:1395)
at org.xmlpull.mxp1.MXParser.next(MXParser.java:1093)
at com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java:63)
... 31 more