private final Collection<ProjectExecutionListener> listeners;

    CompoundProjectExecutionListener(Collection<ProjectExecutionListener> listeners) {
        this.listeners = listeners; // NB this is live injected collection
    }

    @Override
    public void beforeProjectExecution(ProjectExecutionEvent event) throws LifecycleExecutionException {
        for (ProjectExecutionListener listener : listeners) {

        sb.setLength(0);
        repeat(sb, BOX_CHAR, size);
        result.add(sb.toString());
        return result;
    }

    private static void repeat(StringBuilder sb, char c, int nb) {
        for (int i = 0; i < nb; i++) {
            sb.append(c);
        }
    }

    private final Collection<MojoExecutionListener> listeners;

    CompoundMojoExecutionListener(Collection<MojoExecutionListener> listeners) {
        this.listeners = listeners; // NB this is live injected collection
    }

    public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
        for (MojoExecutionListener listener : listeners) {