@Override
    public Map<String, String> getAttributes() {
        return Collections.<String, String>emptyMap();
    }
Creates a new SharedRootConnectionGroup which contains all connections
accessible via the given SharedUserContext. The SharedRootConnectionGroup
is backed by the SharedUserContext, and any changes to the connections
within the SharedUserContext are immediately reflected in the
SharedRootConnectionGroup.

@param userContext
    The SharedUserContext which should back the new
    SharedRootConnectionGroup.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/sharing/connectiongroup/SharedRootConnectionGroup.java