The purpose of the work described in this article is to use database security mechanism as a data access control model in a Java application, developed through an UML-based process. This work relies on the CASE tool Designer from the Oracle company and its associated user and security policy. The three axis of this work are the following ones : • Introducing class diagrams towards Designer analysis and design models (entity-relation ship diagram, design diagrams). • Using Designer features to design user and security policy, and generate database schema. • Reconciling object-oriented and relational worlds through the use of TopLink, an object-relational mapping tool and with the exploitation of a dedicated generator, intended to make the security policy and related information available to the Java application.