asked on 7/21/2008

Class not found - ObjectInputStream

Hi,

I have the attached code to access a file I have serialized using another programme.

Although I get ClassNotFoundException: DataStore on the line 'data = (DataStore) ...'
This happens when i replace the cast with CG2FishEye.DataStore which includes the package the class is in.

Any Suggestions
Thanks
James

DataStore data = null;
           FileInputStream fis = null;
           ObjectInputStream in = null;
           try {
                fis = new FileInputStream(fileChooser.getSelectedFile());
                in = new ObjectInputStream(fis);
                data = (DataStore) in.readObject();
                in.close();
            }
            catch(IOException ex) {
                ex.printStackTrace(); }
            catch(ClassNotFoundException ex) {
                ex.printStackTrace();
            }

Last Comment

7/21/2008

7/21/2008

You must

import java.io.ObjectInputStream;

Member_2_2394978

7/21/2008

ASKER

Sorry didn't include that in my code snipet, I have this imported.

CEHJ

7/21/2008

Sorry the title of your question misled me. The class you're deserializing must be in the classpath

Member_2_2394978

7/21/2008

ASKER

How do you mean?

Does it make a difference that in the programme I serialize the class is in a different package to the one when i deserialize?

Member_2_2394978

7/21/2008

ASKER

Ok it seems to be that it is in different packages!

Which means that the classes are different in each programme, because in one they include a "package xxx;" line at the top and in the other it doesn't!

Anyway to get around this?

ASKER CERTIFIED SOLUTION

CEHJ

7/21/2008

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CEHJ

7/21/2008

... and each is different again from

SomeClass

CEHJ

7/21/2008

>>Anyway to get around this?

No. The class you serialize must be the one you deserialize

Member_2_2394978

7/21/2008

ASKER

Ok cool i'll move any classes needed for the serialization and deserialization into a package called Data - Then usethis package within both programmes. Hopefully that'll work.

Thanks Very Much.
James

SOLUTION

CEHJ

7/21/2008

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CEHJ

7/21/2008

:-)