public RequestErrorFilter(InternalRequestGlobals internalRequestGlobals,
    RequestExceptionHandler exceptionHandler) 
{
        this.internalRequestGlobals = internalRequestGlobals;
        this.exceptionHandler = exceptionHandler;
}

 public boolean service(Request request,
    Response response,
    RequestHandler handler) throws IOException 
{
        try
        {
            return handler.service(request, response);
        }
        catch (IOException ex)
        {
            // Pass it through.
            throw ex;
        }
        catch (Throwable ex)
        {
            // Most of the time, we've got exception linked up the kazoo ... but when ClassLoaders
            // get involved, things go screwy.  Exceptions when transforming classes can cause
            // a NoClassDefFoundError with no cause; here we're trying to link the cause back in.
            // TAPESTRY-2078
            Throwable exceptionToReport = attachNewCause(ex, internalRequestGlobals.getClassLoaderException());
            exceptionHandler.handleRequestException(exceptionToReport);
            // We assume a reponse has been sent and there's no need to handle the request
            // further.
            return true;
        }
}