* repository system instance(s) use {@link RepositorySystem#shutdown()} method on supplied instance(s).
 * <p>
 * Since Resolver 2.0 this class offers access to various components via public getters, and allows even partial object
 * graph construction.
 * <p>
 * Extend this class {@code createXXX()} methods and override to customize, if needed. The contract of this class makes

     * Maven-based resolution. In more detail, this method configures settings relevant for the processing of dependency
     * graphs, most other settings remain at their generic default value. Use the various setters to further configure
     * the session with authentication, mirror, proxy and other information required for your environment. At least,