Serializing and deserailizing an object

[teardrop3903]

Can someone tell me whats wrong with my code?

i get these errors when i run.

Errorjava.io.NotSerializableException: OptionSet$Option
Errorjava.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: OptionSet$Option
Exception in thread "main" java.lang.NullPointerException
	at Driver.main(Driver.java:15)

I guess something went wrong while trying to serialize my OptionSet class but i have no idea how to fix it.


Here is my full project.

Driver:

public class Driver {
	
	public static void main(String[] args) {
		//Build Automobile Object from a file.
		Automobile FordZWT = FileIO.readFile("FordZWT.txt");
		//Print attributes before serialization
		FordZWT.print();
		//Serialize the object
		FileIO.serializeAuto(FordZWT);
		//Deserialize the object and read it into memory
		Automobile newFordZTW = FileIO.deserializeAuto("auto.ser");
		//Print new attributes
		newFordZTW.print();
	}
}

FileIO:

import java.io.*;
import java.util.*;

public class FileIO {
	
	
	public static Automobile readFile(String fileName) {
		Automobile auto = null;
		try {
			FileReader file = new FileReader(fileName);
			BufferedReader buff = new BufferedReader(file);
			StringTokenizer st, jt;
			
			boolean eof = false;
			String line = null;
			
			while (!eof)
			{
				String name = null;
				if ((line = buff.readLine()) != null) {
					name = line;
				}
				
				float a = 0;
				if ((line = buff.readLine()) != null) {
					a = Float.parseFloat(line);
				}
				
				int b = 0;
				if ((line = buff.readLine()) != null) {
					b = Integer.parseInt(line);
				}
				
				auto = new Automobile(name, a, b);
				
				for(int i=0;i<b;i++) {
					if ((line = buff.readLine()) != null) {
						st = new StringTokenizer(line, "|");
						String token = st.nextToken();
						int c = Integer.parseInt(st.nextToken());
						
						auto.setOptionSet(i, c, token);
						
						for (int j = 0; j < c; j++) {
							if ((line = buff.readLine()) != null) {
								jt =  new StringTokenizer(line, "|");
								String token2 = jt.nextToken();
								float d = Float.parseFloat(jt.nextToken());
								
								auto.setOption(i, j, token2, d);
							}
						}
					}
			}
				eof = true;
			}
			buff.close();
		} catch (IOException e) {
				System.out.println("Error" + e.toString());
		}
		return auto;
	}
	
	public static void serializeAuto(Automobile name) {
		try {
			ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("auto.ser"));
			out.writeObject(name);
	        out.close();
		} catch (IOException f) {
			System.out.println("Error" + f.toString());
		}
	}
	
	public static Automobile deserializeAuto(String fileName) {
		Automobile fresh = null;
		try {
			ObjectInputStream in = new ObjectInputStream(new FileInputStream(fileName));
			fresh = (Automobile) in.readObject();
		} catch (IOException g) {
			System.out.println("Error" + g.toString());
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return fresh;
	}
}

Automobile:

import java.io.Serializable;

public class Automobile implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private String name;
	private float base_Price;
	private int number_Of_OptionSets;
	private OptionSet[] optionSet;
	
	public Automobile(String name, float price, int count) {
		this.name = name;
		this.base_Price = price;
		this.number_Of_OptionSets = count;
		optionSet = new OptionSet[count];
	}

	public String getName() {
		return name;
	}
	
	public void setName(String name) {
		this.name = name;
	}

	public float getBase_Price() {
		return base_Price;
	}

	public void setBase_Price(float base_Price) {
		this.base_Price = base_Price;
	}
	
	public int getNumber_Of_OptionSets() {
		return number_Of_OptionSets;
	}

	public void setNumber_Of_OptionSets(int number_Of_OptionSets) {
		this.number_Of_OptionSets = number_Of_OptionSets;
	}
	
	public OptionSet[] getOptionSets() {
		return optionSet;
	}

	public void setOptionSets(OptionSet[] optionSet) {
		this.optionSet = optionSet;
	}
	
	public OptionSet getOptionSet(String name) {
		int  i;
		i = findOptionSet(name);
		if(i == -1)
		{
			System.out.println("Option not Found");
		}
		return optionSet[i];
	}
	
	public void setOptionSet(int i, int j, String name) {
		optionSet[i] = new OptionSet(name, j);
	}

	private int findOptionSet(String Name) {
		int i = 0;
		while(i < number_Of_OptionSets && optionSet[i].getName() != name)
		{
			i++;
		}
		if (i == number_Of_OptionSets)
			return -1;
		else
			return i;
	}
	
	public void setOption(int k, int j, String name, float price) {
			optionSet[k].setOption(j, name, price);
	}
	
	public void print() {
		System.out.println(name);
		System.out.println(base_Price);
		System.out.println(number_Of_OptionSets);
		for (int i = 0; i < number_Of_OptionSets; i++) {
			optionSet[i].print();
		}
	}
}

OptionSet with Option inner class:

import java.io.Serializable;

public class OptionSet implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 2L;
	private String name;
	private int number_Of_Options;
	private Option[] options;

	public OptionSet (String name, int count) {
		this.name = name;
		this.number_Of_Options = count;
		options = new Option[number_Of_Options];
	}
	
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Option[] getOptions() {
		return options;
	}

	public void setOptions(Option[] options) {
		this.options = options;
	}
	
	public Option getOption(String name) {
		int  i;
		i = findOption(name);
		if(i == -1)
		{
			System.out.println("Option not Found");
		}
		return options[i];
	}
	
	public void setOption(int i, String name, float price)
	{
		options[i] = new Option(name, price);
	}
	
	private int findOption(String name) {
		int i = 0;
		while(i < number_Of_Options && options[i].getName() != name)
		{
			i++;
		}
		if (i == number_Of_Options)
			return -1;
		else
			return i;
	}
	
	public void print() {
		System.out.println(name);
		System.out.println(number_Of_Options);
		for (int i =0; i < number_Of_Options; i++) {
			options[i].print();
		}
	}
	
 	class Option {
		private String name;
		private float price;
		
		public Option (String name, float price) {
			this.name = name;
			this.price = price;
		}
		
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		public float getPrice() {
			return price;
		}
		public void setPrice(float price) {
			this.price = price;
		}
		
		public void print() {
			System.out.println(name + " - $" + price);
		}
	}
}

Text file that i'm reading from:

Focus Wagon ZTW
18445
5
Color|10
Fort Knox Gold Clearcoat Metallic|0
Liquid Grey Clearcoat Metallic|0
Infra-Red Clearcoat|0
Grabber Green Clearcoat Metallic|0
Sangria Red Clearcoat Metallic|0
French Blue Clearcoat Metallic|0
Twilight Blue Clearcoat Metallic|0
CD Silver Clearcoat Metallic|0
Pitch Black Clearcoat|0
Cloud 9 White Clearcoat|0
Transmission|2
Automatic|0
Manual|815
Brakes Traction Control|3
Standard|0
ABS|400
ABS with Advance Trac|1625
Side Impact Air Bags|2
Present|350
Not Present|0
Power Moonroof|2
Present|595
Not Present|0

[goldest]

As your error message says,

java.io.NotSerializableException: OptionSet$Option

which means that your inner class Option is not Serializable. Make it to implement Serializable and see what happens.

Goldest