serialVersionUID for serizlizable class [duplicate]

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What does it mean: The serializable class does not declare a static final serialVersionUID field?

The serializable class VaadintestprojectApplication does not declare a static final serialVersionUID field of type long

1. What does this statement mean? I get an error for this.
2. What does serizlizable class do and why do we need to declare a static final for it.

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You should take a look at Serializable javadoc, which explains this far better than any StackOverflow contributor.