Доступ к локальной переменной из внутреннего класса, должен быть объявлен окончательным

Question

Я пытаюсь скомпилировать this bot из исходного кода. Однако я столкнулся с несколькими ошибками.

Он дал мне эти ошибки, когда я пытался скомпилировать -

Information:Using javac 1.8.0_101 to compile java sources 
Information:java: Errors occurred while compiling module 'BumpBot2' 
Information:4/10/2016 10:27 PM - Compilation completed with 18 errors and 0 warnings in 1s 297ms 
C:\Users\gabri\Desktop\BumpBot2\src\com\achow101\bumpbot\BumpBot.java 
Error:(138, 30) java: local variable urlTextField is accessed from within inner class; needs to be declared final 
Error:(139, 35) java: local variable bumpTextTextField is accessed from within inner class; needs to be declared final 
Error:(144, 25) java: local variable errorText is accessed from within inner class; needs to be declared final 
Error:(145, 25) java: local variable errorText is accessed from within inner class; needs to be declared final 
Error:(149, 21) java: local variable errorText is accessed from within inner class; needs to be declared final 
Error:(150, 21) java: local variable errorText is accessed from within inner class; needs to be declared final 
Error:(172, 21) java: local variable errorText is accessed from within inner class; needs to be declared final 
Error:(173, 21) java: local variable errorText is accessed from within inner class; needs to be declared final 
Error:(253, 39) java: local variable grid is accessed from within inner class; needs to be declared final 
Error:(256, 17) java: local variable urlTextField is accessed from within inner class; needs to be declared final 
Error:(257, 17) java: local variable bumpTextTextField is accessed from within inner class; needs to be declared final 
Error:(291, 64) java: local variable entry is accessed from within inner class; needs to be declared final 
Error:(303, 17) java: local variable grid is accessed from within inner class; needs to be declared final 
Error:(303, 43) java: local variable entryUrlLbl is accessed from within inner class; needs to be declared final 
Error:(304, 17) java: local variable grid is accessed from within inner class; needs to be declared final 
Error:(304, 43) java: local variable entryBumpTextLbl is accessed from within inner class; needs to be declared final 
Error:(305, 17) java: local variable grid is accessed from within inner class; needs to be declared final 
Error:(305, 43) java: local variable delBtn is accessed from within inner class; needs to be declared final 

Все они связаны с тем же файлом, BumpBot.java. Разработчик также предоставляет рабочий файл .jar, который я использовал и 100% работает. Когда я декомпилирую его, вывод BumpBot.java является тем же самым.

Я не понимаю, что случилось. Я попытался определить все переменные как final в моем коде, и он исправляет большинство моих ошибок, однако он оставляет четыре ошибки анализа в отношении переменных, относящихся к entry и grid.

Является ли моя установка Java поврежденной?

[ч]

EDIT: Это код в вопросе. Это долго, медведь со мной здесь.

public class BumpBot extends Application { 

    private int gridHeight = 0; 
    private static DoBumps doBumps = new DoBumps(); 
    private static Thread t = new Thread(doBumps); 

    public static void main(String[] args) 
    { 
     // Start do bumps thread 
     t.start(); 
     launch(args); 
    } 

    @Override 
    public void start(Stage primaryStage) throws Exception 
    { 

     // Set GUI Title 
     primaryStage.setTitle("Bitcointalk Thread Bump Bot"); 

     // Create grid for entries 
     GridPane grid = new GridPane(); 
     grid.setAlignment(Pos.TOP_CENTER); 
     grid.setHgap(10); 
     grid.setVgap(10); 
     grid.setPadding(new Insets(25, 25, 25, 25)); 

     // URL Heading lable 
     Label urlLbl = new Label("Bitcointalk URL"); 
     grid.add(urlLbl, 0, 0); 

     // New entry url textfield 
     TextField urlTextField = new TextField(); 
     urlTextField.setPrefWidth(300); 
     grid.add(urlTextField, 0, 1); 
     gridHeight++; 

     // Bump Text heading label 
     Label bumpTextLbl = new Label("Bump Text"); 
     grid.add(bumpTextLbl, 1, 0); 

     // New entry bump text textfield 
     TextField bumpTextTextField = new TextField(); 
     bumpTextTextField.setPrefWidth(300); 
     grid.add(bumpTextTextField, 1, 1); 

     // Button to add entry 
     Button addBtn = new Button("Add Bump Entry"); 
     grid.add(addBtn, 2, 1); 

     // Error text 
     Text errorText = new Text(); 
     grid.add(errorText, 1, 2); 
     gridHeight += 2; 

     // Populate the grid with pre-existing entries 
     // Open a database connection 
     // (create a new database if it doesn't exist yet): 
     EntityManagerFactory emf = Persistence.createEntityManagerFactory("bumps.odb"); 
     EntityManager em = emf.createEntityManager(); 

     // Get the next thread to bump 
     CriteriaBuilder cb = em.getCriteriaBuilder(); 
     CriteriaQuery<BumpEntry> qNextBump = cb.createQuery(BumpEntry.class); 
     Root<BumpEntry> bump = qNextBump.from(BumpEntry.class); 
     qNextBump.select(bump); 
     TypedQuery<BumpEntry> query = em.createQuery(qNextBump); 
     List<BumpEntry> bumpList = query.getResultList(); 
     for (BumpEntry entry : bumpList) 
     { 
      addEntryToGrid(entry, grid); 
     } 

     // Close the database connection: 
     em.close(); 
     emf.close(); 

     // Add the entry when clicked 
     addBtn.setOnAction(new EventHandler<ActionEvent>() { 

      @Override 
      public void handle(ActionEvent e) { 
       // Get the data from the form 
       String url = urlTextField.getText(); 
       String bumpText = bumpTextTextField.getText(); 

       // Check the URL 
       try { 
        if (!url.substring(0, 40).equals("https://bitcointalk.org/index.php?topic=")) { 
         errorText.setFill(Color.RED); 
         errorText.setText("Incorrect URL"); 
         return; 
        } 
       } catch (StringIndexOutOfBoundsException e1) { 
        errorText.setFill(Color.RED); 
        errorText.setText("Incorrect URL"); 
        return; 
       } 

       // Trim the URL to just the topic 
       String trimUrl = url.substring(0, 40); 
       int dotIndex = url.indexOf(".", 40); 
       trimUrl += url.substring(40, dotIndex); 
       trimUrl += ".0"; 

       // Escape the bump text 
       //escapeInput(bumpText); 

       // Open a database connection 
       // (create a new database if it doesn't exist yet): 
       EntityManagerFactory emf = Persistence.createEntityManagerFactory("bumps.odb"); 
       EntityManager em = emf.createEntityManager(); 

       // Check that the thread is not already being bumped 
       BumpEntry bEntry = em.find(BumpEntry.class, trimUrl); 
       if (bEntry != null) 
       { 
        errorText.setFill(Color.RED); 
        errorText.setText("Thread already being bumped"); 
        return; 
       } 

       // Create the entry 
       BumpEntry entry = new BumpEntry(trimUrl, bumpText, 0); 

       // Check the date of the last post 
       try { 
        // Get the first page of the thread 
        Document threadFirstPage = Jsoup.connect(url).get(); 

        // Get the navpages elements 
        Element headerNavBar = threadFirstPage.select("div[id=bodyarea] > table[width=100%][cellspacing=0][cellpadding=0][border=0]").first(); 
        Elements headerNavPages = headerNavBar.select("tr > td.middletext > a.navPages"); 

        // Get the page if there is only one page of posts 
        if (headerNavPages.size() == 0) { 
         headerNavPages = headerNavBar.select("tr > td.middletext > b"); 
        } 

        // Get the last page and calculate url number 
        Element lastPage = headerNavPages.last(); 
        int pages = Integer.parseInt(lastPage.text()); 
        int urlNum = (pages - 1) * 20; 

        // Create the URL for the last page 
        String lastPageUrl = url.substring(0, url.length() - 1); 
        lastPageUrl += urlNum; 

        // Get the last page of the thread 
        Document threadLastPage = Jsoup.connect(lastPageUrl).get(); 

        // Get the last post in thread 
        Element postTable = threadLastPage.select("table[cellpadding=0][cellspacing=0][border=0][width=100%].bordercolor > tbody").first(); 
        Element firstPost = postTable.select("tr").first(); 
        String postClass = firstPost.className(); 
        Elements posts = postTable.select("tr." + postClass); 
        Element lastPost = posts.last(); 

        // Get the date of last post 
        Element headerAndPost = lastPost.select("td.td_headerandpost").first(); 
        Element dateAndSubj = headerAndPost.select("table > tbody > tr > td[valign=middle]").get(1); 
        Element dateElem = dateAndSubj.select("div.smalltext").first(); 
        String dateStr = dateElem.text(); 

        // Parse date string and get unix timestamp 
        SimpleDateFormat fmt = new SimpleDateFormat("MMMM dd, yyyy, hh:mm:ss a"); 
        fmt.setTimeZone(TimeZone.getTimeZone("UTC")); 
        Date date; 
        if (dateStr.contains("Today")) { 
         date = new Date(); 
         String currentDateStr = fmt.format(date); 
         dateStr = dateStr.replace("Today at", currentDateStr.substring(0, currentDateStr.lastIndexOf(",") + 1)); 
        } 
        date = fmt.parse(dateStr); 
        long unixtime = date.getTime()/1000; 
        entry.setTime(unixtime); 


       } catch (Exception e2) { 
        e2.printStackTrace(); 
       } 

       // add entry to db 
       em.getTransaction().begin(); 
       em.persist(entry); 
       em.getTransaction().commit(); 

       // Notify the bumping thread 
       synchronized (doBumps) 
       { 
        doBumps.notify(); 
       } 

       // Close the database connection: 
       em.close(); 
       emf.close(); 

       // Add the entry to display 
       addEntryToGrid(entry, grid); 

       // Clear textfields 
       urlTextField.clear(); 
       bumpTextTextField.clear(); 
      } 
     }); 

     Scene scene = new Scene(grid, 1000, 800); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

    public void addEntryToGrid(BumpEntry entry, GridPane grid) 
    { 
     // Thread URL 
     TextField entryUrlLbl = new TextField(); 
     entryUrlLbl.setText(entry.getUrl()); 
     entryUrlLbl.setEditable(false); 

     // Bump Text 
     TextField entryBumpTextLbl = new TextField(); 
     entryBumpTextLbl.setText(entry.getBumpText()); 
     entryBumpTextLbl.setEditable(false); 

     // Delete button 
     Button delBtn = new Button("Remove"); 
     final int row = gridHeight; 
     delBtn.setOnAction(new EventHandler<ActionEvent>() { 
      @Override 
      public void handle(ActionEvent event) { 

       // Open a database connection 
       // (create a new database if it doesn't exist yet): 
       EntityManagerFactory emf = Persistence.createEntityManagerFactory("bumps.odb"); 
       EntityManager em = emf.createEntityManager(); 

       // Get the entry to be deleted 
       BumpEntry bumpEntry = em.find(BumpEntry.class, entry.getUrl()); 

       // Remove entry from db 
       em.getTransaction().begin(); 
       em.remove(bumpEntry); 
       em.getTransaction().commit(); 

       // Close the database connection: 
       em.close(); 
       emf.close(); 

       // Clear this row's grid 
       grid.getChildren().remove(entryUrlLbl); 
       grid.getChildren().remove(entryBumpTextLbl); 
       grid.getChildren().remove(delBtn); 

       // Notify the bumping thread 
       synchronized (doBumps) 
       { 
        doBumps.notify(); 
       } 
      } 
     }); 

     // Add to display 
     grid.add(entryUrlLbl, 0, gridHeight); 
     grid.add(entryBumpTextLbl, 1, gridHeight); 
     grid.add(delBtn, 2, gridHeight); 
     gridHeight++; 
    } 

    @Override 
    public void stop() 
    { 
     System.exit(0); 
    } 

    public String escapeInput(String input) { 
     String[] characters = {"\"", "\\", "{", "}"}; 
     StringBuilder sb = new StringBuilder(); 
     sb.append("\""); 
     String line = input; 
     for (String test : characters) { 
      line = line.replace(test, "\\" + test); 
     } 
     sb.append("\""); 
     return sb.toString(); 
    } 
} 

Answer 1

Как говорит Суреш Атта здесь Difference between final and effectively final

... начиная с Java SE 8, локальный класс может получить доступ к локальным переменным и параметрам блока ограждающего, которые являются окончательными или эффективно окончательными. Переменная или параметр, значение которого никогда не изменяется после его инициализации, фактически является окончательным.

Если нет зависимости от Java8, вы можете попробовать скомпилировать его с помощью Java7.