* @return The populated execution request, never {@code null}.
     * @throws MavenExecutionRequestPopulationException If the execution request could not be populated.
     */
    MavenExecutionRequest populateDefaults(MavenExecutionRequest request)
            throws MavenExecutionRequestPopulationException;

    /*if_not[MAVEN4]*/

    /**

            }

            request.setToolchains(groupedToolchains);
        }
        return request;
    }

    @Override
    public MavenExecutionRequest populateDefaults(MavenExecutionRequest request)
            throws MavenExecutionRequestPopulationException {
        baseDirectory(request);

        localRepository(request);

        populateDefaultPluginGroups(request);