[java-sdk] New jar to allow Dapr's callback API in SpringBoot

[artursouza]

A SpringBoot Application can easily depend on this jar and have Dapr's callback API running with a simple configuration change and implementing a base class/interface.

As an alternative to a base class, annotations can also be used, similar to how the .Net SDK does with ASP.Net.

[artursouza]

@ji11er

[ji11er]

Hi @artursouza, @amanbha

I assume I follow the spec written here:
https://github.com/dapr/docs/tree/master/reference/api

right?,

Thanks