Webflow+Primefaces:Datatable's LazyLoading Exception cannot be thrown

[kaku]

Hellow!
I use Webflow(2.3.0) and Primefaces(ver 2.2.1) to develop Web Application.
But I face the follow problem.
If somebody know that,Please teach me.

I refer Primefaces's Datatable like follow:

    @Override
    public List<Car> load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String,String> filters) {
       page=pageSize/first+1; 
       List<Car> data = new ArrayList<Car>();
       data =ApplicaiontService.doSearch(page,sortField,sortOrder);
          
        }

        //rowCount
        int dataSize = data.size();
        this.setRowCount(dataSize);

ApplicationService.doSearch that is impossible to cause Exception as like DB down.
So I want to use the follow webflow definition to Catch the Exception:
<transion on-exception="ApplicationException" to="error.xhtml">

Somebody who can help me,Please.
kaku

[kaku]

additional remarks:
I try to throw ApplicationException from load method like follow:
public List<Car> load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String,String> filters) throws Application

but it seems that I am not be allowed to do that.The message show below:imcompatible.
So I also try to catch the ApplicationException like follow:

try{
data =ApplicaiontService.doSearch(page,sortField,sortOrder);
}catch(ApplicationException e)
   RequestContext requestContext = RequestContextHolder.getRequestContext();
   RequestControlContext rec = (RequestControlContext) requestContext;
   rec.handleEvent(new Event(this, "error"));
}

The webflow definition is follow:

<transion on="error" to="error.xhtml">

The error.xhtml is in parent-webflow.xml.

but it cannot be work fun.
Somebody else help me.