private File getCarFile() throws PortalException
{
if (mCarFile == null)
{
CarResources cRes = CarResources.getInstance();
URL classUrl = cRes.findResource(mClassFilePath);
if (classUrl == null)
throw new PortalException(
"Unable to locate CAR containing compiled " +
"controller class file '" + mClassFilePath + "'.");
String carPath = classUrl.toExternalForm();