private Map<String, List<File>> collisions;

    /**
     * Creates a new exception with specified details.
     *
     * @param message The message text, may be {@code null}.
     * @param collisions The POM files of the projects that collided, indexed by their g:a:v, may be {@code null}.
     */

        String name = path.getFileName().toString();
        int dot = name.lastIndexOf('.');
        String ext = dot >= 1 ? name.substring(dot + 1) : "";
        Artifact artifact =
                session.createArtifact(project.getGroupId(), project.getArtifactId(), project.getVersion(), ext);
        attachArtifact(project, artifact, path);
    }