當更新Word的屬性集時，它會在JTextPane中拋出IllegalStateException。

Question

在我的程序中，我有文本窗格。其中，當我在文本窗格中輸入文本時，它將僅更改藍色的java關鍵字的顏色。我的程序正確選擇了這個單詞，但是當我試圖設置單詞屬性時，它會拋出IllegalStateException我該如何解決它？

package event; 

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Font; 
import java.awt.event.KeyEvent; 
import java.awt.event.KeyListener; 
import java.io.BufferedReader; 
import java.io.File; 
import java.io.FileReader; 
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.List; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JTextPane; 
import javax.swing.event.ChangeEvent; 
import javax.swing.event.ChangeListener; 
import javax.swing.event.DocumentEvent; 
import javax.swing.event.DocumentListener; 
import javax.swing.text.SimpleAttributeSet; 
import javax.swing.text.StyleConstants; 

import javax.swing.text.StyledDocument; 

public class SourceCodeWriter implements DocumentListener, KeyListener{ 
    JTextPane pane; 
    public static JPanel contentPane; 
    public static JFrame frame; 
    int poistion = 0; 
    int start = 0; 
    int set = 0; 
    int lock = 0; 
    int count = 0; 
    int endPos = 0; 
    char key; 
    String word = ""; 
    List<String> keywordList = new ArrayList<String>(); 
    public SourceCodeWriter() { 
    } 
    public JPanel createContentPane() { 
    JPanel panel = new JPanel(new BorderLayout()); 
    pane = new JTextPane(); 

    pane.addKeyListener(this); 
    pane.getStyledDocument().addDocumentListener(this); 
    pane.setFont(new Font("Lucida Console",Font.BOLD,20)); 

    panel.add(pane); 
    return panel; 
    } 
    @Override 
    public void changedUpdate(DocumentEvent e) { 

    } 
    @Override 
    public void insertUpdate(DocumentEvent e) { 
    if(key != '\n') { 
     word = word + key; 
    } 
    if(key == ' ' || (int)key == 10) { 
     set = 0; 
     lock = 0; 
     word = ""; 
    } 
    if(lock == 1) { 
     endPos = e.getDocument().getLength(); 
    } 
    if(keywordList.contains(word.trim())){ 
     System.out.println("contains :"+word); 
     update(poistion,endPos-poistion,e); 
    } 
    if(lock == 0) { 
     poistion = count ; 
     lock = 1; 
    } 
    count++; 
    } 
    /** 
    * This method update the attribute set of java keyword word 
    * @param start starting position of the word 
    * @param length length of the word 
    * @param event document event on document where we change the attribute set 
    */ 
    public void update(int start,int length,DocumentEvent event) { 
    try { 
     System.out.println("Word : "+event.getDocument().getText(start, length)+ " #Position : Start : "+start+" end : "+(start+length));; 
    } 
    catch(Exception e) { 
     e.printStackTrace(); 
    } 
    SimpleAttributeSet set = new SimpleAttributeSet(); 
    StyleConstants.setForeground(set, Color.blue); 
    StyledDocument style = pane.getStyledDocument(); 
    style.setCharacterAttributes(start, length, set, true); 
    } 
    @Override 
    public void removeUpdate(DocumentEvent e) { 
    // TODO Auto-generated method stub 

    } 
    public static void createAndShowGUI() { 
    JFrame.setDefaultLookAndFeelDecorated(true); 
    frame = new JFrame(); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    SourceCodeWriter obj = new SourceCodeWriter(); 
    obj.loadKeywordList(); 

    contentPane = obj.createContentPane(); 
    frame.setContentPane(contentPane); 

    frame.setVisible(true); 
    frame.setSize(400,400); 
    } 
    public static void main(String[] args) { 
    javax.swing.SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      createAndShowGUI(); 
     } 
    }); 
    } 
    @Override 
    public void keyPressed(KeyEvent e) { 
    // TODO Auto-generated method stub 

    } 
    @Override 
    public void keyReleased(KeyEvent e) { 
    // TODO Auto-generated method stub 

    } 
    @Override 
    public void keyTyped(KeyEvent e) { 
    key = e.getKeyChar(); 

    } 
    /** 
    * This method is used to load all Keyword in java in list from a txt file. 
    */ 
    public void loadKeywordList() { 
    File keywordFile = new File("D:/JavaKeywordList.txt"); 
    String line =""; 
    try { 
     BufferedReader reader = new BufferedReader(new FileReader(keywordFile)); 
     while((line = reader.readLine()) != null) { 
     keywordList.add(line.trim()); 
     } 
    } 
    catch(IOException e) { 
     e.printStackTrace(); 
    } 
    } 
} 

而且Exeption日誌：

Exception in thread "AWT-EventQueue-0" Word : int #Position : Start : 0 end : 3 
java.lang.IllegalStateException: Attempt to mutate in notification 
    at javax.swing.text.AbstractDocument.writeLock(Unknown Source) 
    at javax.swing.text.DefaultStyledDocument.setCharacterAttributes(Unknown Source) 
    at event.SourceCodeWriter.update(SourceCodeWriter.java:96) 
    at event.SourceCodeWriter.insertUpdate(SourceCodeWriter.java:72) 
    at javax.swing.text.AbstractDocument.fireInsertUpdate(Unknown Source) 
    at javax.swing.text.AbstractDocument.handleInsertString(Unknown Source) 
    at javax.swing.text.AbstractDocument.insertString(Unknown Source) 
    at javax.swing.text.AbstractDocument.replace(Unknown Source) 
    at javax.swing.JTextPane.replaceSelection(Unknown Source) 
    at javax.swing.JTextPane.replaceSelection(Unknown Source) 
    at javax.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(Unknown Source) 
    at javax.swing.SwingUtilities.notifyAction(Unknown Source) 
    at javax.swing.JComponent.processKeyBinding(Unknown Source) 
    at javax.swing.JComponent.processKeyBindings(Unknown Source) 
    at javax.swing.JComponent.processKeyEvent(Unknown Source) 
    at java.awt.Component.processEvent(Unknown Source) 
    at java.awt.Container.processEvent(Unknown Source) 
    at java.awt.Component.dispatchEventImpl(Unknown Source) 
    at java.awt.Container.dispatchEventImpl(Unknown Source) 
    at java.awt.Component.dispatchEvent(Unknown Source) 
    at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source) 
    at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source) 
    at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source) 
    at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source) 
    at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source) 
    at java.awt.Component.dispatchEventImpl(Unknown Source) 
    at java.awt.Container.dispatchEventImpl(Unknown Source) 
    at java.awt.Window.dispatchEventImpl(Unknown Source) 
    at java.awt.Component.dispatchEvent(Unknown Source) 
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
    at java.awt.EventQueue.access$500(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
    at java.awt.EventQueue$4.run(Unknown Source) 
    at java.awt.EventQueue$4.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
    at java.awt.EventQueue.dispatchEvent(Unknown Source) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.run(Unknown Source) 

Answer 1

更改updateMethod代碼（）的，

StyledDocument style = pane.getStyledDocument(); 
Runnable runnable = new Runnable() { 
     @Override 
     public void run() { 
      style.setCharacterAttributes(start, length, set, true); 
     } 
    }; 
    SwingUtilities.invokeLater(runnable);