NotSerializableException after adding to ArrayList

Question

So I have this class called World:

public class World implements Serializable {

    private int dx;
    private int dy;
    private int x;
    private int y;
    private Path path;
    public ImageIcon image;
    public ArrayList<Location> locations;

I was serializing and deserializing it just fine before I added an object to the ArrayList<Location> locations;

Now when I try to run the serialization

try {
    FileOutputStream fos = new FileOutputStream(Main.board.worldpath.toString());
    ObjectOutputStream oos = new ObjectOutputStream(fos);
    oos.writeObject(Main.board.world.image);
    oos.writeObject(Main.board.world);
    oos.close();
}catch (FileNotFoundException ex) {
    ex.printStackTrace();
} catch (IOException ex) {
    ex.printStackTrace();
}

It throws java.io.NotSerializableException: sun.nio.fs.WindowsPath in this line oos.writeObject(Main.board.world);

The class Location is also serializable:

public class Location implements Serializable {
    public int x;
    public int y;
    public String name;
    public String desc;

I'm not sure why it would say that it's not serializable so is there anything special about serializing ArrayLists?

pL4Gu33 · Accepted Answer · 2015-07-26 08:56:11Z

2

The problem is the "Path". The Class is not Serializable. You can save "path" as string for example and create a new path on load.

Implement readObject and writeObject for it and make the path transient.

answered Jul 26, 2015 at 8:56

pL4Gu33

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2 Comments

seMikel Over a year ago

Thank you, I changed it to a String and it works now. Odd, I've been loading and saving these worlds with the Path there but it never threw me an exception.

Stephen C Over a year ago

Perhaps it has always been null up until now.

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