findbugs:check - ClassNotFoundException: org.apache.commons.collections.ExtendedProperties

in pom.xml:

...
<build>
...
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<version>2.3.3</version>
</plugin>
...
</build>

mvn clean compile findbugs:check
[INFO] Scanning for projects...
...
[INFO] >>> findbugs-maven-plugin:2.3.3:check (default-cli) @ example >>>
[INFO]
[INFO] — findbugs-maven-plugin:2.3.3:findbugs (findbugs) @ example —
[WARNING] Error initializing: class org.codehaus.plexus.velocity.DefaultVelocityComponent
java.lang.NoClassDefFoundError: org/apache/commons/collections/ExtendedProperties
at org.apache.velocity.runtime.RuntimeInstance.<init>(RuntimeInstance.java:164)
...
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.ExtendedProperties
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
...
[ERROR] Failed to execute goal org.codehaus.mojo:findbugs-maven-plugin:2.3.3:findbugs (findbugs) on project datatables: Execution findbugs of goal org.codehaus.mojo:findbugs-maven-plugin:2.3.3:findbugs failed: Unable to load the mojo 'findbugs' in the plugin 'org.codehaus.mojo:findbugs-maven-plugin:2.3.3'. A required class is missing: org/apache/commons/collections/ExtendedProperties

@ Workaround @

...
<build>
...
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<version>2.3.3</version>
<dependencies>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
</dependency>
</dependencies>
</plugin>
...
</build>