The central class of this package and the default Filter for passing
RequestParameters to IJucasBeans (IPeers).
Baiscly when a Request with the marking parameter jucas-action is
encountered (see
ActionCode ) the parameters of the request are mapped to properties of an
IPeer .
A IJucasBean which implements
this interface is informed to process if a method or properties have been set on one
of it's direct or indirect child IPeers.
This Exception should be thrown if the the procesing of the
ActionFilter should be interrupted, but request should be further processed in
the filter-chain.