JavaAPI BonitaEngineAPI BDM

Retrieve value of business object use Bonita Engine API

Hello, i'm new Bonita, i have a case need idea for project Spring boot retrieve value on business object.

The first, i seen that how can get value of business object with add file jar entitis and DAO in link :

And it work good. But this way is very dependencies file jar export from Bonita and just static attribute for external project.