Serialization issue.

x-files · by **x-files** » Mon Jan 14, 2008 9:53 am

Write object works fine.
Read object throws ClassNotFoundException: Snapshot can't found.

write object:

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        FileOutputStream fOut = context.openFileOutput(FILE_PATH,
 
                                                ApplicationContext.MODE_WORLD_READABLE);
 
        ObjectOutputStream osw = new ObjectOutputStream(fOut); 
 
        osw.writeObject(snapshot);
 
        osw.flush();
 
        osw.close();
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and

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read object: 
 
        FileInputStream fis = context.openFileInput(FILE_PATH);
 
        ObjectInputStream ois = new ObjectInputStream(fis); 
 
        snapshot = (Snapshot)ois.readObject();
 
        ois.close();
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where

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public class Snapshot implements Serializable{
 
        private double contentValue;
 
        private double memoryValue;
 
}
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plusminus · by **plusminus** » Mon Jan 14, 2008 6:18 pm

Hello x-files,

hm, your code looks really correct :!:

Is all code in the same Activity :?:

(probably yes)

does it work without the cast to Snapshot (just putting into object):?: (also probably not the problem of your Exception)

Unfortunately I've got no time to actually test the code, perhaps tonight...

Regards,
plusminus

x-files · by **x-files** » Tue Jan 15, 2008 10:57 am

>> Is all code in the same Activity Question (probably yes)
Yes.

>> does it work without the cast to Snapshot (just putting into object)Question (also probably not the problem of your Exception)

I tried Object obj = ois.readObject();

Exception was throwed here still.

As workarround i implement readObject() and writeObject() methods in Snapshot:

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        public void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
 
                contentValue = (BigDecimal)ois.readObject();
 
                memoryValue = (BigDecimal)ois.readObject();
 
        }
 
        public void writeObject(ObjectOutputStream oos) throws IOException {
 
                oos.writeObject(contentValue);
 
                oos.writeObject(memoryValue);
 
        }
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It's work fine.

But I don't understand why standart serialization mechanism don't work.
(I mean readObject() when object is user defined class).

Serialization issue.

Serialization issue.

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