Issue with creating edge in OrientDb with Blueprints / Tinkerpop - graph-databases

Question

I am recently trying to learn OrientDb and now that I am somewhat familiar with the OrientDb console itself I am moving on to using Blueprints to write a simple java program to create a graph. I am trying to create a few vertices and edges between them, but although my vertices are created successfully, I am unable to see my edges unless I call the method for creation twice. If I comment out one of the calls, none of the edges are being created. I tried checking for any timing issues by adding sleep times, but nothing seems to help.
I tried to check using the console and I see the vertices created but not the edges. I am running 1.7 rc-1 for orient.
Here is the sample code I am trying to get working:
public class OrientPrototype {
static OrientGraph graph = new OrientGraph("remote:localhost/Tinker", "admin", "admin");
public static void main( String[] args ) {
removeAllExistingVerticesAndEdges();
createSimpleGraph();
displayAllVertices(getAllVertices("Person"), "name");
displayAllEdges(getAllEdges("Friend"));
}
private static void removeAllExistingVerticesAndEdges() {
for (Vertex v : graph.getVertices())
v.remove();
for (Edge e : graph.getEdges())
e.remove();
}
private static void createSimpleGraph() throws InterruptedException {
createPersons();
createFriendships();
//createFriendships();
}
private static void createPersons() {
String [] persons = {"John", "Jack", "Ryan"};
if (graph.getVertexType("Person") == null)
graph.createVertexType("Person");
for (int i = 0; i < persons.length; i++) {
try {
Vertex v = graph.addVertex("class:Person");
v.setProperty("name", persons[i]);
graph.commit();
}
catch (Exception e) {
graph.rollback();
System.out.println("Error while creating the persons. Had to roll back");
}
}
System.out.println("Done creating vertices...");
}
private static void createFriendships() {
if (graph.getEdgeType("Friend") == null) {
graph.createEdgeType("Friend");
graph.commit();
}
Map<String, Vertex> vertices = new HashMap<String, Vertex>();
for (Vertex v : graph.getVertices())
vertices.put(v.getProperty("name").toString(), v);
try {
graph.addEdge("class:Friend", vertices.get("John"), vertices.get("Jack"), "is friend");
graph.addEdge("class:Friend", vertices.get("Jack"), vertices.get("Ryan"), "is friend");
graph.addEdge("class:Friend", vertices.get("Ryan"), vertices.get("John"), "is friend");
graph.commit();
System.out.println("Done creating edges...");
}
catch (Exception e) {
graph.rollback();
System.out.println("Error while creating the edges between persons. Had to roll back");
}
}
private static Iterable<Vertex> getAllVertices(String classname) {
return graph.getVerticesOfClass(classname);
}
private static void displayAllVertices(Iterable<Vertex> it, String propertyName) {
System.out.println("The vertices in the graph are:");
for (Vertex v: it)
System.out.println(v + " " + v.getProperty("name"));
}
private static Iterable<Edge> getAllEdges(String classname) {
return graph.getEdgesOfClass(classname);
}
private static void displayAllEdges(Iterable<Edge> it) {
System.out.println("The edges in the graph are:");
for (Edge e: it)
System.out.println(e);
}
}
I do not believe that I am doing something wrong because when I look at the console for OrientDb, I do not see any Edges in the Schema tab for class Friend when I make the single call to createEdge method? These do appear however after the second call. Moreover I also see the incoming and outgoing links to the Person class when I run a select from Person query on the Person class. These incoming and outgoing links appear only when I call the createEdge method at least once.
Any help is greatly appreciated. Also attaching the dependencies from my maven pom file if it is of any help:
<dependencies>
<dependency>
<groupId>com.tinkerpop.blueprints</groupId>
<artifactId>blueprints-orient-graph</artifactId>
<version>2.5.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.tinkerpop.gremlin</groupId>
<artifactId>gremlin-java</artifactId>
<version>2.5.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.orientechnologies</groupId>
<artifactId>orient-commons</artifactId>
<version>1.7-rc1</version>
</dependency>
<dependency>
<groupId>com.orientechnologies</groupId>
<artifactId>orientdb-core</artifactId>
<version>1.7-rc1</version>
</dependency>
<dependency>
<groupId>com.orientechnologies</groupId>
<artifactId>orientdb-client</artifactId>
<version>1.7-rc1</version>
</dependency>
<dependency>
<groupId>com.orientechnologies</groupId>
<artifactId>orientdb-object</artifactId>
<version>1.7-rc1</version>
</dependency>
<dependency>
<groupId>com.orientechnologies</groupId>
<artifactId>orientdb-enterprise</artifactId>
<version>1.7-rc1</version>
</dependency>
</dependencies>

Answer 1

Just tying up loose ends here...answered in the gremlin-users mailing list:
https://groups.google.com/forum/#!topic/gremlin-users/xUNeuJkPyUo
Basic summary given Luca's response...First turn off lightweight edges:
alter database custom useLightweightEdges=false
Then make sure to use the newer OrientDB dependency:
<dependency>
<groupId>com.orientechnologies</groupId>
<artifactId>orientdb-graphdb</artifactId>
<version>1.7-rc1</version>
</dependency>