Invalid modification of facesConfig.getFacesFlowDefinitions() collection when implicit flow definition is derived

I found an small bug running some examples for JSF 2.2 Faces Flow. When implicit flow definition is derived there is a call to facesConfig.getFacesFlowDefinitions().add(flow). That code worked well before, but in the cleanup the code was updated to return a not modifiable collection in getFacesFlowDefinitions().

The solution is just replace the line with:

facesConfig.addFacesFlowDefinition(flow);