Java 更新word的属性集时，会在JTextPane中引发IllegalStateException

在我的程序中，我有一个文本窗格。在其中，当我在文本窗格中输入文本时，它只会将java关键字的颜色更改为蓝色。我的程序正确地选择了单词，但当我试图在单词上设置属性时，它抛出了

IllegalStateException

如何解决它

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();
    }
  }
}

---

将updateMethod（）中的代码更改为

不允许修改文档侦听器中的内容

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)

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