When using FindBugs 2.0.0, and the fb-contrib plugin is enabled, the Jenkins plugin gets an NPE when parsing the resulting XML file, causing the build to fail:

[FINDBUGS] Collecting findbugs analysis files...
ERROR: Publisher hudson.plugins.findbugs.FindBugsPublisher aborted due to exception
java.lang.NullPointerException
at edu.umd.cs.findbugs.Project.setPluginStatus(Project.java:130)
at edu.umd.cs.findbugs.SAXBugCollectionHandler.startElement(SAXBugCollectionHandler.java:384)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at edu.umd.cs.findbugs.SortedBugCollection.doReadXML(SortedBugCollection.java:356)
at edu.umd.cs.findbugs.SortedBugCollection.doReadXML(SortedBugCollection.java:327)
at edu.umd.cs.findbugs.SortedBugCollection.readXML(SortedBugCollection.java:314)
at hudson.plugins.findbugs.parser.FindBugsParser.readXml(FindBugsParser.java:263)
at hudson.plugins.findbugs.parser.FindBugsParser.parse(FindBugsParser.java:206)
at hudson.plugins.findbugs.parser.FindBugsParser.parse(FindBugsParser.java:143)
at hudson.plugins.findbugs.parser.FindBugsParser.parse(FindBugsParser.java:103)
at hudson.plugins.analysis.core.FilesParser.parseFile(FilesParser.java:358)
at hudson.plugins.analysis.core.FilesParser.parseFiles(FilesParser.java:317)
at hudson.plugins.analysis.core.FilesParser.invoke(FilesParser.java:266)
at hudson.plugins.analysis.core.FilesParser.invoke(FilesParser.java:31)
at hudson.FilePath.act(FilePath.java:756)
at hudson.FilePath.act(FilePath.java:738)
at hudson.plugins.findbugs.FindBugsPublisher.perform(FindBugsPublisher.java:158)
at hudson.plugins.analysis.core.HealthAwarePublisher.perform(HealthAwarePublisher.java:338)
at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:27)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:662)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:638)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:616)
at hudson.model.Build$RunnerImpl.post2(Build.java:161)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:585)
at hudson.model.Run.run(Run.java:1398)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:145)
[WARNINGS] Skipping publisher since build result is FAILURE

The plugin section of the XML file looks something like this:

<?xml version="1.0" encoding="UTF-8"?>

<BugCollection version="2.0.0" sequence="0" timestamp="1325796064745" analysisTimestamp="1325796064756" release="">
<Project projectName="">

....

<Plugin id="com.mebigfatguy.fbcontrib" enabled="true"/>
</Project>