code: public static <T> String getInstanceVariables(Class<T> clas) {
  		StringBuffer fieldsString = new StringBuffer();
  		Field[] fields = clas.getDeclaredFields();
  		int i = 0;
  		for (Field field : fields) {
  			if (i++ > 0) {
  				fieldsString.append(JK.CSV_SEPARATOR);
  			}
  			fieldsString.append(field.getName());
  		}
  		return fieldsString.toString();
  	}
docs: Gets the instance variables.
  
  @param      <T> the generic type
  @param clas the clas
  @return the instance variables