Problems with my object serialization

Hi everyone,

Im trying to store an arraylist by serializing it.

The problem is, that it wont work, im getting the not serializable exception:

Code:

---

java.io.NotSerializableException: ImageResults
        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)

---

Is there any way around this? do i need to serialize every object in the arraylist or something? My serialising class and the class of the objects which are found in the arraylist are below:

please help - thanks :)

The class where i serialize the arraylist

Code:

---

import java.io.*;
import java.util.*;
 
public class FeatureDatabase {
 
        public void writeToDatabase (ArrayList imageResults) {
 
                for (int i=0; i<imageResults.size(); i++) {
                       
                        ImageResults ir = (ImageResults)imageResults.get(i);                       
                        System.out.println(ir.name);
                }
               
                ObjectOutput output = null;
 
                try {
                        // use buffering
                        OutputStream file = new FileOutputStream("FeatureDatabase.db");
                        OutputStream buffer = new BufferedOutputStream(file);
                        output = new ObjectOutputStream(buffer);
                        output.writeObject(imageResults);
                }
 
                catch (IOException ex) {
                        ex.printStackTrace();
                        System.out.println("\n\nCannot perform output: "+ex.getLocalizedMessage());
                }
 
                finally {
 
                        try {
 
                                if (output != null) {
                                        // flush and close "output" and its underlying streams
                                        output.close();
                                }
 
                        }
 
                        catch (IOException ex) {
                                System.out.println("Cannot close output stream.");
                        }
                }
        }
 
        public ArrayList getDatabase () {}

---

My arraylist which im trying to serialize is full of these objects:
Do i need to make this class extend serializable???????

Code:

---

import java.util.Vector;
 
public class ImageResults {
 
        public String name;
        public String location;
        private Vector ccvResults;
        private Vector acResults;
        private Vector dctResults;
        private Vector gmResults;
        private Vector histogramResults;
        private Vector miResults;
 
        /* getter and setter methods */

---

Yes ... the error is telling you that you need to make your ImageResults class implement the Serializable interface. This interface is like Cloneable: there are no methods to implement, you just need to explicitly state that the class can be serialized.