[TYPO3-dev] Dispatch Error after adding Boolean Property to Demand Class

[g4-lisz at tonarchiv.ch]

He there

In my extbase project i'm using a non-persistent object "Demand" for a 
search form. Everything worked fine...

Now i added a new property "isLocalKanton" to this Demand class:

         /*
          * Local to Kanton
          *
          * @var boolean $isLocalKanton
          */
         protected $isLocalKanton = false;

         /**
          * @param  boolean $isLocalKanton
          * @return void
          */
         public function setIsLocalKanton($isLocalKanton) {
                 $this->isLocalKanton = (boolean)$isLocalKanton;
         }

         /**
          * @return boolean isLocalKanton
          */
         public function getIsLocalKanton() {
                 return $this->isLocalKanton;
         }

In the view i added a checkbox to the form:

<f:form name="demand" pluginName="fe_search_results" object="{demand}" 
action="results" pageUid="26">
<f:form.checkbox property="isLocalKanton" value="1" />
     [...]
</f:form>

Before this change, everything worked flawlessly with other boolean 
properties.

Now i get the error: "Could not ultimately dispatch the request after 
101 iterations. Most probably, a @dontvalidate annotation is missing on 
re-displaying a form with validation errors."

Why is this? I can't see any mistake in my code...

The action for displaying the search form looks like this:
/**
  * Displays Fachabteilung Search Form
  *
  * @param Tx_Hplusinfo_Domain_Model_SearchDemand $demand The optional 
default values
  * @return void
  * @dontvalidate $demand
  */
public function abteilungAction(Tx_Hplusinfo_Domain_Model_SearchDemand 
$demand = NULL) {
     if ($demand === NULL) {
         $demandSession = 
unserialize($GLOBALS["TSFE"]->fe_user->getKey("ses", "demand"));
         if ( ($demandSession instanceof 
Tx_Hplusinfo_Domain_Model_SearchDemand)
&& ($demandSession->getPageId() == $GLOBALS["TSFE"]->id)
         ) {
             $demand = $demandSession;
         }
         else {
             $demand = new Tx_Hplusinfo_Domain_Model_SearchDemand();
             $GLOBALS["TSFE"]->fe_user->setKey("ses", "demand", NULL);
         }
     }

     $this->view->assign('demand', $demand);
     $this->view->assign('abteilungs', 
$this->abteilungRepository->findAll());
}

If i the form checkbox is commented out, the error disappears. Again, 
all other checkboxes work fine!

I commented out the catch {} in the dispatcher loop 
(typo3_src-4.6.1/typo3/sysext/extbase/Classes/MVC/Dispatcher.php:93).
Now it throws a Tx_Extbase_MVC_Exception_StopAction in 
/typo3_src-4.6.1/typo3/sysext/extbase/Classes/MVC/Controller/AbstractController.php:277:

         public function forward($actionName, $controllerName = NULL, 
$extensionName = NULL, array $arguments = NULL) {
                 $this->request->setDispatched(FALSE);
                 $this->request->setControllerActionName($actionName);
                 if ($controllerName !== NULL) 
$this->request->setControllerName($controllerName);
                 if ($extensionName !== NULL) 
$this->request->setControllerExtensionName($extensionName);
                 if ($arguments !== NULL) 
$this->request->setArguments($arguments);
                 throw new Tx_Extbase_MVC_Exception_StopAction();
         }

The request is forwarded to another action? Maybe that's a hint for 
someone who knows the mechanisms..

Any help will be much appreciated!
Cheers, Till