@Entity
@Indexed
public class NeoArtifact implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column
    private String groupId;

    @Column
    private String artifactId;

    @OneToMany
    private Map<NeoArtifactDependency, NeoArtifact> dependencies = new HashMap<>();

}

@Embeddable
public class NeoArtifactDependency implements Serializable {

    private String scope;

    private String creator;
}

    @Inject
    private NeoArtifactDAO ntd;

...

        NeoArtifact na = new NeoArtifact();
        na.setArtifactId("example " + System.currentTimeMillis());
        na.setGroupId("eu.example");
        na.setVersion("1." + r.nextInt(20) + "." + r.nextInt(20));
        na.setClassifier("javadoc");
        ntd.create(na);

        NeoArtifact n1 = new NeoArtifact();
        n1.setArtifactId("example1 " + System.currentTimeMillis());
        n1.setGroupId("eu.example");
        n1.setVersion("1." + r.nextInt(20) + "." + r.nextInt(20));
        n1.setClassifier("javadoc");
        ntd.create(n1);
        na.addDependency(n1, "compile", "doe");

        NeoArtifact n2 = new NeoArtifact();
        n2.setArtifactId("example2 " + System.currentTimeMillis());
        n2.setGroupId("eu.example");
        n2.setVersion("1." + r.nextInt(20) + "." + r.nextInt(20));
        n2.setClassifier("javadoc");
        ntd.create(n2);
        na.addDependency(n2, "test", "doe");

        NeoArtifact n3 = new NeoArtifact();
        n3.setArtifactId("example3 " + System.currentTimeMillis());
        n3.setGroupId("eu.example");
        n3.setVersion("1." + r.nextInt(20) + "." + r.nextInt(20));
        n3.setClassifier("javadoc");
        ntd.create(n3);
        na.addDependency(n3, "compile", "doe");

        ntd.update(na);

        ntd.create(na);