docs: public static String createCustomExpressionInvocationText2(String customExpName) {
  
          String fieldsMap = getTextForFieldsFromScriptlet();
          String parametersMap = getTextForParametersFromScriptlet();
          String variablesMap = getTextForVariablesFromScriptlet();
  
  //		String stringExpression = "((("+CustomExpression.class.getName()+")$P{"+customExpName+"})."
  //				+CustomExpression.EVAL_METHOD_NAME+"( "+ fieldsMap +", " + variablesMap + ", " + parametersMap +" ))";
  
          return "((" + CustomExpression.class.getName() + ")$P{REPORT_PARAMETERS_MAP}.get(\"" + customExpName + "\"))."
                  + CustomExpression.EVAL_METHOD_NAME + "( " + fieldsMap + ", " + variablesMap + ", " + parametersMap + " )";
      }