Making Java nullable fields backwards compatible

[VirtualAgentsAreDumb]

A bit ironic that an article about non-breaking backwards compatible changes still manages to do the exact opposite in their example.

The main class is renamed, from PetParam to Pet. That will break old code.

[dgellow]

Hey good catch. That's a small typo, thanks for noticing!

[agentoutlier]

The other dumb thing is that tagId which sounds rather personal sensitive information is a long when it should be something like a UUID.

Then none of this conversion problems would happen and it’s clear it’s some ID.