}

    @Override
    @Nonnull
    public Optional<Project> getExecutionProject(@Nonnull Project project) {
        // Session keep tracks of the Project per project id,
        // so we cannot use session.getProject(p) for forked projects
        // which are temporary clones
        return Optional.ofNullable(getMavenProject(project).getExecutionProject())
                .map(p -> new DefaultProject(session, p));
    }

     *         or an empty Optional if the input is already the original project
     * @throws IllegalArgumentException if the project is null
     */
    @Nonnull
    Optional<Project> getExecutionProject(@Nonnull Project project);

        if (project != null) {
            File file = findArtifact(project, artifact, true);
            if (file == null && project != project.getExecutionProject()) {
                file = findArtifact(project.getExecutionProject(), artifact, true);
            }
            return file;
        }

        // No project, but most certainly a dependency which has been built previously