为什么writeObject会抛出java.io.NotSerializableException，我该如何修复它？
为什么writeObject会抛出java.io.NotSerializableException，我该如何修复它？
提问于 2012-12-16 04:22:41
我有这个异常，我不明白为什么会抛出它，或者我应该如何处理它。
try {
os.writeObject(element);
} catch (IOException e) {
e.printStackTrace();
}其中element是一个包含其他TransformGroup的TransformGroups，它是Atom类的一个实例：
public class Atom extends Group implements Serializable{
float pozX,pozY;
Group group= new Group();
Color3f blue = new Color3f(new Color(255));
Color3f black = new Color3f(new Color(0));
Sphere AtSph=new Sphere();
public Atom(final float WEIGHT, final int BOUNDS,final float radius,Color3f color)
{
AppSetting ap= new AppSetting(color, black);
AtSph=new Sphere(radius,1,100,ap);
}
}完整的错误日志：
java.io.NotSerializableException: javax.media.j3d.TransformGroup
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at cls.MolecularBuilder.addAtom(MolecularBuilder.java:511)
at cls.MolecularBuilder$Console.HidrogenItemActionPerformed(MolecularBuilder.java:897)
at cls.MolecularBuilder$Console$2.actionPerformed(MolecularBuilder.java:746)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$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$200(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$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.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$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)AppSetting (在Atom类中)只是一个扩展外观的自定义类。
回答 1
Stack Overflow用户
发布于 2021-03-19 20:53:44
如上所述，如果类是第三方类，则需要将其转换为JSON/XML/BSON对象，因为第三方类对象无法序列化。
我在做我的项目时遇到了同样的问题，我使用gson库将我的类对象转换为JSON字符串。之后，我在那个对象中使用了这个字符串，并通过ObjectOutputStream对象传递了它。在客户端，我使用相同的方法将JSON字符串恢复为第三方类对象。
您可以从这里下载jar：https://jar-download.com/artifacts/com.google.code.gson/gson/2.8.2/source-code！
下面是我是如何做到的：
// Method that returns String through a Object as a parameter i.e to be converted
public static String generateJSONStringFromObject(ThirdPartyClass object) throws JsonProcessingException{
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
String jsonString = mapper.writeValueAsString(object);
return jsonString;
}
// Method that returns Object through a String as a parameter
public static ThirdPartyClass generateObjectFromJSONString(String jsonString){
Gson gson = new Gson();
ThirdPartyClass thirdPartyClassObject = gson.fromJson(jsonString, ThirdPartyClass.class);
return thirdPartyClassObject;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/13895867
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