Neo4j embedded graph java visualization

Drivers & Stacks Java
1

Hi,
I'm beginning in Neo4j java embedded graph.
I have made a first test but I cant visualize my graph in neo4j-community.

Here is my code for create the graph :

package connection;

import java.io.File;

import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;

public class embededdedGraph {

	public static void main(String... args) throws Exception {
		GraphDatabaseFactory graphDbFactory = new GraphDatabaseFactory();
		File graphDir = new File("/home/nicolas/neo4j-community-3.5.14/data/databases/cars.db");
		GraphDatabaseService graphDb = graphDbFactory.newEmbeddedDatabase(graphDir);
		Transaction tx = graphDb.beginTx();
		
		createNode(graphDb);
	
		tx.close();

	}
	
	public static void createNode(GraphDatabaseService graphDb) {
		Node car = graphDb.createNode();
		car.addLabel(Label.label("Car"));

		car.setProperty("make", "tesla");
		car.setProperty("model", "model3");

		Node owner = graphDb.createNode(Label.label("Person"));
		owner.setProperty("firstName", "Oliver");
		owner.setProperty("lastName", "John");
		owner.createRelationshipTo(car, RelationshipType.withName("owner"));
	}

}

Next I change the value of "#dbms.active_database" to "dbms.active_database=cars.db.

When I restart neo4j-community the db name is "cars.db" but it's indicated there no labels and relationships in the database.

Thanks a lot,

Nicolas.

2

You have to call tx.success(); before calling tx.close(); in order to have the changes committed. Best practice is to wrap the transaction in a try block like this:

  Transaction tx=graphDb.beginTx();
  try {
    createNode(graphDB);
    tx.success();
  }
  finally {
    tx.finish();
  }

HTH

3

Thanks for your answer !

Nicolas