WidgetTransformer.scala

WidgetTransformer.scala

/**
 * Transforms from single request parameters to an object, for instance in this case from a Widget ID
 * to an Actual Widget, or returns None if a transformation cannot be done.<br/>
 * Must be registered with the TransformerRegistry, as done in the bootstrap above.
 */
class WidgetTransformer extends StringValueTransformer[Widget]{
  def toValue(from: String): Option[Widget] =  Widgets.find(Integer.parseInt(from))
}

if(widget == None)
  return None
else
  return widget

can be replaced with

return widget

Also, do you really mean to use the return keyword? Perhaps your intention is simply:

def toValue(from: String): Option[Widget] = Widgets.find(Integer.parseInt(from))

Good catch, I have no idea why it's been done that way. Brain meltdown. :)