JMX configuration generator throws NoClassDefFoundError exception

Exception in thread "main" java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at com.simontuffs.onejar.Boot.run(Boot.java:306)
	at com.simontuffs.onejar.Boot.main(Boot.java:159)
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/io/FileUtils
	at org.opennms.features.jmxconfiggenerator.Starter.doMain(Starter.java:179)
	at org.opennms.features.jmxconfiggenerator.Starter.main(Starter.java:115)
	... 6 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.io.FileUtils
	at com.simontuffs.onejar.JarClassLoader.findClass(JarClassLoader.java:602)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 8 more