Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
We have a very old class which doesn’t have serialVersionUID.
4 years back someone added serialVersionUID to this class with a random value. He should have used serialver tool to find the value and used it while adding serialVersionUID, but that was not the case.
There are customers using both the versions of this class.
Now if I want to deserialize the old customer’s objects is there any way out. I can’t change the current serialVersionUID since the new customers will be affected.
You will have to write your own
readObject()method that can handle the different UIDs.“Versioning of Serializable Objects” explains what the UID means and what the rules are.
This answer goes into more details.
I tried to find a good example how to write
readObject()for some object that has several UIDs but couldn’t find any. There isn’t even an example in “Effective Java” by Joshua Bloch. It just says “If you change the UID, you will get an error” but not how to handle this error gracefully.This question at least comes close: How to deserialize an object persisted in a db now when the object has different serialVersionUID