Question

Has anyone seen problems with UnionBugs ant task?

My maven build generates findbugs via maven plugin and concatenates xml via antrun using unionBugs in a reporting project that concatenates all the reports together via antrun. When the end to end build runs I see the error below but the files exist and can be read. When I just run the concat project after the build I generate the desired report. I’d expect heap space issues to throw a very different error and have 2G for heap.

Let me know if you have some ideas how to investigate this. If not, I’ll update the question should I figure it out. For now, I’m splitting this into two maven executions which is ok but not ideal.

error

Trouble reading/parsing .../core/api/target/findbugs/findbugsXml.xml

pom excerpt

<taskdef name="unionBugs" classname="edu.umd.cs.findbugs.anttask.UnionBugs" classpathref="maven                <taskdef name="unionBugs" classname="edu.umd.cs.findbugs.anttask.UnionBugs" classpathref="maven.plugin.classpath"/>

            <!-- Combin findbugs output -->
            <delete dir="${trunk}/target/findbugs" />
            <mkdir dir="${trunk}/target/findbugs" />
            <unionBugs to="${findbugs.xml.out}">
              <fileset dir="${trunk}">
                <include name="core/**/target/findbugs/findbugsXml.xml"/>
                <include name="app/target/findbugs/findbugsXml.xml"/>
                <include name="modules/*/target/findbugs/findbugsXml.xml"/>
              </fileset>
            </unionBugs>

Answer 1

The problem can be caused my exceeding ulimit for max open files (ulimit -n). I do not know if this is the only way to encounter the problem.

• Problem happens only after running a full build which generates findbugs results
• unionBugs task executed in separate maven process does not cause the problem
• ulimit -n175 ; cd concat-findbugs; mvn install results in the problem

Solution – raise the ulimit Setting Max Open files on Linux