On Nov 29, 2007, at 3:00 PM, Adrian Bartholomew wrote:
I have a client/server app using an object called User that
implements Serializable in the shared package.
Everything worked perfectly up until i added an ArrayList of class
UserStatus to the User members.
Now I keep getting:
java.io.InvalidClassException: User; local class incompatible:
stream classdesc serialVersionUID = xxxxxxxxxxxxx, local class
serialVersionUID = yyyyyyyyyyyy
In my experience that message means that the implementation of the
class that is deserializing the object doesn't have the same
implementation of the class that serialized the object. This can
happen if you write your object to disk, change the object's class'
signature, then try to read the object back from disk. If you don't
specify serialVersionUID one gets computed from the class' signature.
If you didn't have a serialVersionUID when you serialized the object,
then added your ArrayList, then ran serialver to determine the
serialVersionUID, you'll get a different serialVersionUID than the one
that was used when the object was serialized.
--
Rick Genter
email@hidden
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