是什麼讓一個JavaFX 2任務成功/失敗

Question

我有一個做了Navison查找並返回ObservableList或空任務。
無論如果，如果看起來是成功的，該列表填充與否任務總是調用失敗（）和從來沒有成功（）！
任何想法爲什麼發生這種情況？
這是我的任務：

public class LoadLocsTask extends Task<Void>{ 
    Button button; 
    @Override protected Void call() throws Exception { 

      ObservableList<String> list = application.getValidator().getLocList(button.getText()); 
      if(list != null){ 
       locationList.setItems(list); 
      }else{ 
       Dialogs.showErrorDialog(application.getPrimaryStage(),"An error occured while retrieving the loaction list from navision.", "Please contact IS department", "Unable To Populate Location List"); 
       locationList.setItems(null); 
      } 
     return null;  
    } 

    @Override protected void succeeded() { 
     super.succeeded(); 
     selectProgressIndicator.setVisible(false); 
     disableSelected(button); 

    } 
    @Override protected void failed() { 
     super.failed(); 
     selectProgressIndicator.setVisible(false); 
     disableSelected(button); 

    } 
    @Override protected void scheduled() { 
     super.scheduled(); 
     locationList.getSelectionModel().clearSelection(); 
     locationList.setItems(null); 
     selectProgressIndicator.setVisible(true); 
     disableAll(); 

    } 
    @Override protected void cancelled() { 
     super.cancelled(); 
     logger.info("Cancelled"); 
     locationList.setItems(null); 
     selectProgressIndicator.setVisible(true); 

    } 

這裏是application.getValidator（）getLocList（button.getText（））

public ObservableList<String> getLocList(String selectedLoc) { 
    ObservableList<String> binsOL = null; 
    String warehouseCode = null; 
    if (selectedLoc.equalsIgnoreCase("location1")) { 
     warehouseCode = "LOCATION1"; 
    } else if (selectedLoc.equalsIgnoreCase("location2")) { 
     warehouseCode = "LOCATION2"; 
    } else if (selectedLoc.equalsIgnoreCase("location3")) { 
     warehouseCode = "LOCATION3"; 
    } else if (selectedLoc.equalsIgnoreCase("location4")) { 
     warehouseCode = "LOCATION4"; 
    } else if (selectedLoc.equalsIgnoreCase("location5")) { 
     warehouseCode = "LOCATION5"; 
    } 

    if (warehouseCode != null) { 
     try { 
      binsOL = FXCollections.observableArrayList(); 
      Bins[] bins = navWebservice.getBinsList(warehouseCode); 
      for (Bins bin : bins) { 
       binsOL.add(bin.getCode()); 
      } 
     } catch (RemoteException e) { 
      logger.error("LocationSelectionController - processLocButton(): Could not generate list for " + warehouseCode + " button", e); 
      Dialogs.showErrorDialog(parentApp.getPrimaryStage(), e.getMessage(), "Please contact IS department", "Unable To Populate Location List"); 

     } 
    } 
    return binsOL; 

} 

在此先感謝！

Answer 1

您的代碼不是線程安全的，你不應該是顯示對話框，並沒有Platform.runLater包裝這些操作在更新你的任務調用方法列表視圖項。

欲瞭解更多信息，搜索的計算器和Platform.runLater JavaFX的併發：

• Platform.runLater and Task in JavaFX