Re: Help java.io.NotSerializableException

From:
Ian Shef <invalid@avoiding.spam>
Newsgroups:
comp.lang.java.programmer
Date:
Wed, 03 Jun 2009 20:45:25 GMT
Message-ID:
<Xns9C1F8BF2140F8vaj4088ianshef@138.126.254.210>
"Netlopa" <netlopaNO@SPAM.it> wrote in
news:h06klm$n17$1@news.gabrix.ath.cx:

<snip>

I still have this exception "java.io.NotSerializableException".
I tried to put anything as a parameter ... but nothing.

<snip>

public class File {

      

    /**

     * Create a simple Hashtable and serialize it to a file called

     * HTExample.ser.

     */

    public static void doSave(Object gestore) {

 

        System.out.println();

        System.out.println("+------------------------------+");

        System.out.println("| doSave Method |");

        System.out.println("+------------------------------+");

        System.out.println();

       

        Hashtable h = new Hashtable();

        h.put("gestore.Partita", gestore);

   

        /*h.put("string", "Oracle / Java Programming");

        h.put("int", new Integer(36));

        h.put("double", new Double(Math.PI));*/

        

       

        

 

        try {

 

            System.out.println("Creating File/Object output stream...");

           

            FileOutputStream fileOut = new
            FileOutputStream("D:\\HTExample.ser");

            ObjectOutputStream out = new ObjectOutputStream(fileOut);

 

            System.out.println("Writing Hashtable Object...");

            out.writeObject(h);

 

            System.out.println("Closing all output streams...\n");

            out.close();

            fileOut.close();

           

        } catch(FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }


When you serialize an object, all the objects referenced by that object
must also be serialized, and so on recursively.
Hashtable is serializable. Hashtable h references:
various String objects, which are serializable.
Integer(36), which is serializable.
Double(Math.Pi), which is serializable.
Object gestore, which is NOT serializable.
This is why you get a NotSerializableException.

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