在可序列化对象上获取NotSerializableException [英] Getting NotSerializableException on a serializable object

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本文介绍了在可序列化对象上获取NotSerializableException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

基本上，我编写了一个程序，将形状绘制到屏幕上，并将每个形状保存到ArrayList中.我想做的是弄清楚如何将ArrayList保存到文件中，以便以后可以调用它并编辑已经存在的形状.

Basically, I've written a program that paints shapes onto the screen, and saves each of the shapes into an ArrayList. What I want to do is figure out how to save the ArrayList to a file, so that I can call it back up later and edit the already existing shapes.

所以我一直在弄清楚为什么我已经使对象Shape可以序列化时为什么仍然不断收到NotSerializableException的问题.

So I've been having some trouble figuring out why exactly I keep getting a NotSerializableException when I made the object Shape serializable already.

下面是代码的保存部分和Shape对象.

Below is the save portion of my code, and the Shape object.

save.addActionListener(new ActionListener(){
  public void actionPerformed(ActionEvent e){
    int returnVal = fc.showSaveDialog(BallWorld.this);
    if(returnVal == JFileChooser.APPROVE_OPTION){
      File file = fc.getSelectedFile();
      ArrayList list = bp.shapes;
      FileOutputStream fos = null;
      ObjectOutputStream oos = null;
      try{
        fos = new FileOutputStream(file);
        oos = new ObjectOutputStream(fos);
        oos.writeObject(list);
        oos.close();
      }
      catch(IOException ex){
        ex.printStackTrace();
      }
    }
  }
});


  public class Shape implements Serializable{
    int radius;
    Point center;
    Color color;
    int sides;
    Polygon shape;
    public Shape(int _radius, Point _center, Color _color, int _sides){
      radius = _radius;
      center = _center;
      color = _color;
      sides = _sides;
    }
    public void draw(Graphics g){
      Graphics2D g2d = (Graphics2D) g; 
      g2d.setColor(color);
      shape = new Polygon();
      if(sides != 0 && sides != 4){
        if(sides % 2 == 0){
          if(sides / 2 % 2 == 0){
            for(int i = 0; i < sides; i++){
              shape.addPoint((int) (center.x + radius * Math.cos(i * 2 * Math.PI / sides - Math.PI / sides)), (int) (center.y + radius * Math.sin(i * 2 * Math.PI / sides - Math.PI / sides)));
            }
          }
          else if(sides / 2 % 1 == 0){
            for(int i = 0; i < sides; i++){
              shape.addPoint((int) (center.x + radius * Math.cos(i * 2 * Math.PI / sides)), (int) (center.y + radius * Math.sin(i * 2 * Math.PI / sides)));
            }
          }
        }
        else{
          for(int i = 0; i < sides; i++){
            shape.addPoint((int) (center.x + radius * Math.cos(i * 2 * Math.PI / sides - Math.PI / 2)), (int) (center.y + radius * Math.sin(i * 2 * Math.PI / sides - Math.PI / 2))); 
          }
        }
        g2d.fillPolygon(shape);
      }
      else if(sides == 4){
        g2d.fillRect(center.x - radius, center.y - radius, radius * 2, radius * 2);
      }
      else{
        g2d.fillOval(center.x - radius, center.y - radius, radius * 2, radius * 2);
      }
      repaint();
    }
    public boolean contains(Point p){
      if(sides == 0){
        if(center.distance(p) <= radius){
          return true;
        }
      }
      else if(sides == 4){
        if(p.x <= center.x + radius && p.x >= center.x - radius && p.y <= center.y + radius && p.y >= center.y - radius){
          return true;
        }
      }
      else{
        if(shape.contains(p)){
          return true;
        }
      }
      return false;
    }
  }


java.io.NotSerializableException: javax.swing.plaf.basic.BasicFileChooserUI$AcceptAllFileFilter
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeArray(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
at javax.swing.JComboBox.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
at javax.swing.JLabel.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeArray(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at javax.swing.ArrayTable.writeArrayTable(Unknown Source)
at javax.swing.JComponent.writeObject(Unknown Source)
at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
at java.awt.Window.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at java.awt.Window.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at java.util.ArrayList.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at BallWorld$2.actionPerformed(BallWorld.java:112)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(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.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(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$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.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)

推荐答案

要避免NotSerializableException，请确保:

To avoid NotSerializableException make sure:

  1. 您的课程实现可序列化
  2. 所有非原始的成员实现可序列化(或临时的)
  3. 如果您的课程是内部课程，则它是静态的或外部课程实现 可序列化
  1. your class implements Serializable
  2. all non primitive members implement Serializable (or are transient instead)
  3. if your class is an inner class it's either static or the outer class implements Serializable

此外，您还需要为每个Serializable类定义 serialVersionUID .检查以上所有3种情况，再加上:

Besides that you also need to define serialVersionUID for every Serializable class. Check all 3 cases above plus:

  1. 所有可序列化的超类
  2. 如果您的班级是匿名班级，也可以在其中定义它
  1. all Serializable superclasses
  2. if your class is an anonymous class, define it there too

注意:您的代码有时可以在没有serialVersionUID的情况下工作，但是阅读Serializable的javadoc的最后一段，以了解为什么根据环境会出现问题.

Note: your code may work without serialVersionUID sometimes but read the last paragraph in Serializable's javadoc to understand why it will be a problem depending on the environment.

有一个VM选项可以为异常添加详细信息.它显示了根类和嵌套类无法序列化:

There's a VM option to add details to the exception. It shows the root and nested classes failing to serialize:

-Dsun.io.serialization.extendedDebugInfo=true

这篇关于在可序列化对象上获取NotSerializableException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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