When building an ant project with many subprojects, I like to run find bugs on each of them independently. However there isn’t (wasn’t till now) a good way to merge all the bug reports into a single file.
Define the task:
<taskdef name="UnionBugs" classname="edu.umd.cs.findbugs.anttask.UnionBugs">
<classpath>...</classpath>
</taskdef>
Usage:
<unionbugs to="${testreports.dir}/findbugs.xml">
<fileset dir="${plugin.basedir}">
<include name="**/*_findbugsparts.xml">
</include>
</fileset>
</unionbugs>
Download: findbugs-ant-merge.jar
This has been contributed and included in findbugs version 1.3.6-rc3 available at http://findbugs.sourceforge.net/downloads.html