graphdb/src/main/java/com/tinkerpop/blueprints/impls/orient/OrientBaseGraph.java
public OrientVertex addVertex(final String iClassName, final String iClusterName) {
    makeActive();

    setCurrentGraphInThreadLocal();
    autoStartTransaction();

    final OrientVertex vertex = getVertexInstance(iClassName);

    // SAVE IT
    if (iClusterName != null)
      vertex.save(iClusterName);
    else
      vertex.save();
    return vertex;
  }
public OrientVertex addVertex(final String iClassName, final String iClusterName) {
    makeActive();

    setCurrentGraphInThreadLocal();
    autoStartTransaction();

    final OrientVertex vertex = getVertexInstance(iClassName);

    // SAVE IT
    if (iClusterName != null)
      vertex.save(iClusterName);
    else
      vertex.save();
    return vertex;
  }
(Blueprints Extension) Creates a new unconnected vertex with no fields of specific class in a cluster in the Graph.

@param iClassName   Vertex class name
@param iClusterName Vertex cluster name

@return New vertex created