The implementation package should not be used by developers, it is an internal implementation detail which will break compatibility between major Codename One releases. The purpose of this package is to provide ISVs, vendors and operators with the ability to customize & enhance Codename One from within without breaking compatability with existing Codename One applications.

A vendor extension begins by extending the CodenameOneImplementation class and implementing the abstract methods within. To use this version of the implementation a user can use the Display class and link to a vendor JAR that doesn't include any portion of Codename One.