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object byte array to object instance

sam bartl
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Joined: Oct 29, 2010
Posts: 44
We save object instance byte array into database , reload it into object instance . Suppose I have instance byte array in database and we modified object by adding a new property , old properties are as it is, now If I try to reload this byte array into modified object instance I get call cast exception is the any way I can reload the byte array into this modified object ?


William Brogden
Author and all-around good cowpoke
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Joined: Mar 22, 2000
Posts: 12682
    
    5
IF what you are talking about is
1. serializing an object instance to a byte[] and saving it.
2. revising the class by adding a new variable (think variable, not property) (not modifying object, modifying class)
3. attempting to recover the serialized object using the new class definition.

THEN
No you can't, why would you expect to be able to?

See java.io.Serializable JavaDocs for the use of serialVersionUID

IF you are not talking about serializing an object, please explain more.

Bill

Java Resources at www.wbrogden.com
sam bartl
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Joined: Oct 29, 2010
Posts: 44
I am assuming this will work if my object delcares a serialVersionUID




please advice me what value should I give to this variable
Rob Spoor
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Joined: Oct 27, 2005
Posts: 19544
    
  16

Omit it at first, then use the "serialver" tool that you can find in the JDK's bin folder to generate one for you. If you use an IDE you can also let it generate it for you; it probably uses serialver in the background.
Then just copy and paste this declaration, and make it private.


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