public DuplicateProjectException(String message, Exception e) {
        super(message, e);
        this.projectId = null;
        this.existingProjectFile = null;
        this.conflictingProjectFile = null;
    }

    public DuplicateProjectException(
            String projectId, File existingProjectFile, File conflictingProjectFile, String message) {
        super(message);
        this.projectId = projectId;

     * @param collisions The POM files of the projects that collided, indexed by their g:a:v, may be {@code null}.
     */
    public DuplicateProjectException(String message, Map<String, List<File>> collisions) {
        super(message, (File) null);

        this.collisions = (collisions != null) ? collisions : new LinkedHashMap<>();
    }

    /**
     * Gets the POM files of the projects that collided.
     *