Neo4j transaction handling, contrived example...

gistfile1.java

import org.neo4j.graphdb.Transaction;

import com.tinkerpop.blueprints.Vertex;
import com.tinkerpop.blueprints.impls.neo4j.Neo4jGraph;


public class Neo4jTest {
    
	private final String[] testData = {
		"foo",
		"bar",
		null, // Oops! Null property
		"baz"
	};
	
	private final Neo4jGraph graph;
	
	public Neo4jTest() {
		graph = new Neo4jGraph("test-graph" + (new java.util.Date()).getTime());
	}
	
	public void createThing(String value) throws Exception {
		Transaction tx = graph.getRawGraph().beginTx();
		try {
			Vertex vertex = graph.addVertex(null);
			vertex.setProperty("key", value);
			tx.success();
		} catch (Exception e) {
			tx.failure();
			throw e;
		} finally {
			tx.finish();
		}
	}
	
	public void createBatch() throws Exception {
		Transaction tx = graph.getRawGraph().beginTx();
		try {
			for (String t : testData) {
				createThing(t);
			}
			tx.success();
		} catch (Exception e) {
			tx.failure();
			throw e;
		} finally {
			tx.finish();
		}
	}
	
	public int countNodes() {
		int count = 0;
		for (Vertex _ : graph.getVertices()) count++;
		return count;
	}
	
	public static void main(String[] args) {
		Neo4jTest testRunner = new Neo4jTest();
		try {
			testRunner.createBatch();
		} catch (Exception e) {
			System.err.println("Caught exception: " + e.getMessage());			
		}
		System.out.println("Nodes in graph: " + testRunner.countNodes());
	}

}