if (result == null) {
// validation error, get form
Form startForm = startFormDef.getForm();
// generate form HTML
String formHtml = formService.retrieveFormErrorHtml(startForm, formData);
AppDefinition appDef = appService.getAppDefinition(getRequestParameterString("appId"), getRequestParameterString("appVersion"));
// show form
setProperty("headerTitle", process.getName());
setProperty("view", "formView");