sbool isPersistableClass(Class c) {
  if (isAnonymousClassName(c.getName())) false;
  if (isBoxedType(c)) true;
  if (isArrayType(c)) true;
  if (c == S || c == File || c == Color.class) true;
  
  if (hasThisDollarFields(c))
    ret hasSingleArgumentConstructor(c);
  else
    ret getDefaultConstructor(c) != null;
}