user.description=Mit einem Sternchen markierte Felder sind Pflichtfelder und müssen ausgefüllt werden { 0 } { 1 }.

 public   class  ParsePropertyFile {
     private   static   final   int  PARAM_ERROR = - 1 ;
     private   static   final  String FILE_PATH = "resources/";
    
    /**
     * Get list of params for string
     * @param str
     * @param key
     * @return Collection
     */
     private   static  Collection getParams(String str, String key) {
        Collection list =  new  ArrayList();
         int  index =  0 ;
         int  openBracket =  0 ;
         int  closeBracket =  0 ;

         int  amount = amountOfParameters(str, key);
         if (amount != PARAM_ERROR && amount >  0 ) {
             for ( int  i =  0 ; i < amount; i++) {
                openBracket = str.indexOf("{", index);
                closeBracket = str.indexOf("}", index);
                index = closeBracket + 1 ;
                list.add(str.substring(openBracket, closeBracket +  1 ));
            }
        }
         return  list;
    }

    /**
     * Return amount of parameters
     * @param str
     * @param key
     * @return int
     */
     private   static   int  amountOfParameters(String str, String key) {
         int  amount =  0 ;
         int  stack =  0 ;
        String symbol = "";

         for ( int  i =  0 ; i < str.length(); i++) {
            symbol = str.substring(i, i+ 1 );

             if (symbol.equals("}")) {
                stack--;
            }
             if (symbol.equals("{")) {
                stack++;
                amount++;
            }
        }

         if (stack !=  0 ) {
            System.err.println("Wrong some of value parameters for key: " + key);
             return  PARAM_ERROR;
        }
         else  {
             return  amount;
        }
    }

     public   static   void  main(String[] args) {
        Collection params;
        String output;
        OutputStream file;                                                                                        
        String pathInputFile;
        String pathOutputFile;

         try  {
            /* todo: For console entering
            BufferedReader br;
            System.out.print("Enter path input file: ");
            br = new BufferedReader(new InputStreamReader(System.in));
            pathInputFile = br.readLine();
            System.out.print("Enter path output file: ");
            br = new BufferedReader(new InputStreamReader(System.in));
            pathOutputFile = br.readLine();
            */

            // todo: For constant entering
            pathInputFile  = FILE_PATH + "ApplicationMessages.properties";
            pathOutputFile = FILE_PATH + "ApplicationMessagesTest.properties";

            // output file
            file =  new  FileOutputStream(pathOutputFile);
            // input file
            ResourceBundle myResources =  new  PropertyResourceBundle( new  FileInputStream(pathInputFile));
            Enumeration e = myResources.getKeys();
             while  (e.hasMoreElements()) {
                String key = (String) e.nextElement();
                String value = myResources.getString(key);

                output = key + "=" + key;
                params = getParams(value, key);
                 if  (!params.isEmpty()) {
                    Iterator iter = params.iterator();
                     while  (iter.hasNext()) {
                        output = output + " " + iter.next();
                    }
                }
               
                // write to file
                String str =  new  String(myResources.getString(key).getBytes("ISO-8859-1"),"UTF-8");
                file.write(("#" + str + "\n").getBytes());
                file.write((output + "\n").getBytes());
            }
            file.close();
        }
         catch  (FileNotFoundException e) {
            System.err.println("File not found:" + "\n" + e.getMessage());
            e.printStackTrace();
        }
         catch  (IOException e) {
            System.err.println(e.getMessage());
            e.printStackTrace();
        }
    }
}

#Mit einem Sternchen markierte Felder sind Pflichtfelder und m?ssen ausgef?llt werden { 0 } { 1 }.
user.description=user.description { 0 } { 1 }

ResourceBundle myResources =  new  PropertyResourceBundle( new  FileInputStream(pathInputFile));

String str =  new  String(value.getBytes("ISO-8859-1"), "UTF-8");
file.write(("#" + str + "\n").getBytes("UTF-8"));
file.write((output + "\n").getBytes());