Is this a freestyle or maven job?

It is a maven job.

Hmm, my build has no problem when running with maven 3.1.0. Is your build on the master or slave?

Both our Jenkins (on two seperate computers) run as the only master. And both have the same problem. We have the definition for FindBugs xml creation in the parent POM in the "profile" section.
...
<profile>
...
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<configuration>
<failOnError>false</failOnError>
<xmlOutput>true</xmlOutput>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
<plugins>
<build>
<profile>

I still can't reproduce the problem. Can you please attach a small example project that exposes the bug?

I am experiencing the same problem, though this is the first Java/Maven project in our Jenkins setup.

• Single master - no slaves
• OpenJDK 7u25 + Maven 3.1.0 + Jenkins 1.527
• FindBugs Maven 2.5.2 + FindBugs Jenkins 4.49
• All other projects are PHP + Ant

Log:

INFO org.codehaus.mojo.findbugs.FindBugsMojo - Done FindBugs Analysis....
WARN org.apache.maven.eventspy.internal.EventSpyDispatcher - Failed to notify spy hudson.maven.Maven3Builder$JenkinsEventSpy: Failed to load edu.umd.cs.findbugs.detect.TestASM

I do not see the message about SortedBugCollection in this bug's description.

Here is an example which does not work on our Jenkins with Maven 3.1 but with Maven 3.0.

Pre Step: "clean install" on the parent pom
Build step: "clean install -P integration-build -X -e" on the parent pom

Ok, thanks. I installed the project, but it works on my machine.

I'm using: Jenkins AND maven integration plugin 1.528. Can you retry with that version?

BTW: i replaced the jgoodies version to 1.6.0 (the other is not in central)