Check if all view parameters are valid via a lambda expression

Lambda expression for validating if all view parameters are valid:

<h:body>

 #{facesContext.validationFailed ?

  (vdl = facesContext.application.viewHandler.getViewDeclarationLanguage(facesContext, view.viewId);

   viewMetadata = vdl.getViewMetadata(facesContext, view.viewId);

   allViewParams = viewMetadata.getViewParameters(view);

   allViewParams.size() gt 0 ? (allViewParams.stream().forEach((t) ->

    (t.valid ? '': (facesContext.externalContext.responseCommitted ? '' :

   facesContext.externalContext.responseSendError(400,"One of your view parameters is invalid !");

   facesContext.responseComplete())))):''):''}

 <h:outputText value="All view parameters are valid!"/>

</h:body>