# Package com.mysql.cj.callback

Interface Summary
MysqlCallback: Implementations of this interface can be passed to a `MysqlCallbackHandler` so that the owner of the callback handler and its caller can share data in a way that would otherwise require tighter coupling.
MysqlCallbackHandler: A functional interface for implementing callback handlers.

Class Summary
UsernameCallback: A callback that can be used to exchange username information to a callback handler owner.
WebAuthnAuthenticationCallback: The callback object used by the authentication plugin AuthenticationWebAuthnClient to exchange authenticator data between the driver and the client application.

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