[JIRA] [global-build-stats] (JENKINS-17248) java.lang.NullPointerException by start

Sun, 16 Jun 2013 05:15:27 -0700

I tried to migrate my local workspace from 1.424 to 1.508 and I encountered the problem, full stacktrace :

Jun 16, 2013 1:35:42 PM hudson.plugins.global_build_stats.business.GlobalBuildStatsPluginSaver reloadPlugin
SEVERE: Unable to read /Users/fcamblor/Documents/projects/Jenkins-Plugins/global-build-stats/./work/global-build-stats.xml
hudson.util.IOException2: Unable to read /Users/fcamblor/Documents/projects/Jenkins-Plugins/global-build-stats/./work/global-build-stats.xml
	at hudson.XmlFile.unmarshal(XmlFile.java:170)
	at hudson.Plugin.load(Plugin.java:239)
	at hudson.plugins.global_build_stats.GlobalBuildStatsPlugin.load(GlobalBuildStatsPlugin.java:98)
	at hudson.plugins.global_build_stats.business.GlobalBuildStatsPluginSaver.reloadPlugin(GlobalBuildStatsPluginSaver.java:98)
	at hudson.plugins.global_build_stats.business.GlobalBuildStatsBusiness.reloadPlugin(GlobalBuildStatsBusiness.java:382)
	at hudson.plugins.global_build_stats.GlobalBuildStatsPlugin$GlobalBuildStatsItemListener.onLoaded(GlobalBuildStatsPlugin.java:149)
	at jenkins.model.Jenkins.<init>(Jenkins.java:849)
	at hudson.model.Hudson.<init>(Hudson.java:81)
	at hudson.model.Hudson.<init>(Hudson.java:77)
	at hudson.WebAppMain$2.run(WebAppMain.java:214)
Caused by: com.thoughtworks.xstream.converters.ConversionException: null : null
---- Debugging information ----
cause-exception     : java.lang.NullPointerException
cause-message       : null
class               : hudson.plugins.global_build_stats.GlobalBuildStatsPlugin
required-type       : hudson.plugins.global_build_stats.GlobalBuildStatsPlugin
converter-type      : hudson.plugins.global_build_stats.xstream.GlobalBuildStatsXStreamConverter
path                : /hudson.plugins.global_build_stats.GlobalBuildStatsPlugin
line number         : 2
version             : null
-------------------------------
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1061)
	at hudson.util.XStream2.unmarshal(XStream2.java:109)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1045)
	at hudson.XmlFile.unmarshal(XmlFile.java:166)
	... 9 more
Caused by: java.lang.NullPointerException
	at java.util.ArrayList.addAll(ArrayList.java:472)
	at hudson.plugins.global_build_stats.model.JobBuildResultSharder.load(JobBuildResultSharder.java:140)
	at hudson.plugins.global_build_stats.xstream.migration.AbstractMigrator.readGlobalBuildStatsPOJO(AbstractMigrator.java:35)
	at hudson.plugins.global_build_stats.xstream.GlobalBuildStatsXStreamConverter.unmarshal(GlobalBuildStatsXStreamConverter.java:159)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
	... 18 more
Jun 16, 2013 1:35:43 PM hudson.WebAppMain$2 run


Problem is I cannot reproduce it now (problem fired only once, and after a jenkins restart it didn't pop anymore).

If someone have any more input to reproduce the problem (backuped global-build-stats.xml for instance), it would be helpful for a fix.
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