Findbugs Implementing Class error

[lbordowitz]

I get an error when running findbugs through the sputnik maven plugin.

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.eu.ingwar.maven:sputnik-maven-plugin:1.2.0:gerrit (default-cli) on project [Project]: Execution default-cli of goal org.eu.ingwar.maven:sputnik-maven-plugin:1.2.0:gerrit failed: An API incompatibility was encountered while executing org.eu.ingwar.maven:sputnik-maven-plugin:1.2.0:gerrit: java.lang.IncompatibleClassChangeError: Implementing class
....
Caused by: java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
at edu.umd.cs.findbugs.PluginLoader.loadPluginComponents(PluginLoader.java:797)
at edu.umd.cs.findbugs.PluginLoader.(PluginLoader.java:398)
at edu.umd.cs.findbugs.PluginLoader.loadCorePlugin(PluginLoader.java:1433)
at edu.umd.cs.findbugs.PluginLoader.loadInitialPlugins(PluginLoader.java:1387)
at edu.umd.cs.findbugs.PluginLoader.(PluginLoader.java:154)
at edu.umd.cs.findbugs.DetectorFactoryCollection.getCoreResource(DetectorFactoryCollection.java:360)
at edu.umd.cs.findbugs.SystemProperties.loadPropertiesFromConfigFile(SystemProperties.java:77)
at edu.umd.cs.findbugs.SystemProperties.(SystemProperties.java:60)
at edu.umd.cs.findbugs.AbstractBugReporter.(AbstractBugReporter.java:51)
at pl.touk.sputnik.processor.findbugs.FindBugsProcessor.createBugReporter(FindBugsProcessor.java:64)
at pl.touk.sputnik.processor.findbugs.FindBugsProcessor.process(FindBugsProcessor.java:23)
at pl.touk.sputnik.review.Engine.review(Engine.java:45)
at pl.touk.sputnik.review.Engine.run(Engine.java:33)
at org.eu.ingwar.maven.sputnik.SputnikAbstractMojo.execute(SputnikAbstractMojo.java:124)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)

I don't know if this is a problem with this sputnik plugin, sputnik itself, or my maven setup. Checkstyle works properly, by the way.