Incompatible versions of Jena used in the various helpers
The rdf-helper-jena-selection relies on version of Jena where the class com.hp.hpl.jena.arp.DOM2Model exists and is needed. This helper is deprecated an not maintained but some components are still using it.
The rdf-helper-jena-selection relies on version of Jena where the class com.hp.hpl.jena.xmlinput.DOM2Model exists and is needed.
However between version 2.12.1 and 2.12.0 the class DOM2Model has been swapped between the two packages...