private void configureCustomChange() throws CustomChangeException {
   try {
     for (String param : params) {
       ObjectUtil.setProperty(customChange, param, paramValues.get(param));
     }
     customChange.setFileOpener(getResourceAccessor());
     customChange.setUp();
   } catch (Exception e) {
     throw new CustomChangeException(e);
   }
 }
 /**
  * Get the value of a parameter set by {@link #setParam(String, String)}. If the parameter was not
  * set, null will be returned.
  */
 public String getParamValue(String key) {
   return paramValues.get(key);
 }