TxHandOver.java

import org.junit.Test;
import org.neo4j.graphdb.*;
import org.neo4j.kernel.GraphDatabaseAPI;
import org.neo4j.test.TestGraphDatabaseFactory;

import javax.transaction.TransactionManager;

import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

public class TxHandOver {

    @Test
    public void testTransactionHandover() throws Exception {
        TestGraphDatabaseFactory factory = new TestGraphDatabaseFactory();
        final GraphDatabaseAPI db = (GraphDatabaseAPI) factory.newImpermanentDatabase();
        DependencyResolver resolver = db.getDependencyResolver();
        final TransactionManager txManager = resolver.resolveDependency( TransactionManager.class );
        final DynamicRelationshipType relationshipType = DynamicRelationshipType.withName("REL");

        final Transaction neoTx = db.beginTx();
        final Node n1 = db.createNode();
        n1.setProperty("a", "b");
        final javax.transaction.Transaction transaction = txManager.suspend();

        Runnable committer = new Runnable() {
            @Override
            public void run() {
                try {
                    txManager.resume(transaction);
                    Node n2 = db.createNode();
                    n2.setProperty("x", "y");
                    n1.createRelationshipTo(n2, relationshipType);
                    neoTx.success();
                    neoTx.close();
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }
        };
        Thread thread = new Thread(committer);
        thread.start();
        thread.join();

        try ( Transaction ignore = db.beginTx())
        {
            Node nx = db.getNodeById(n1.getId());
            Object value1 = "b";
            assertThat(nx.getProperty("a"), is(value1));
            assertTrue(nx.hasRelationship(relationshipType, Direction.OUTGOING));

            Relationship relationship = nx.getSingleRelationship(relationshipType, Direction.OUTGOING);
            Node ny = relationship.getEndNode();
            Object value2 = "y";
            assertThat(ny.getProperty("x"), is(value2));
        }
    }
}

Please don't do stuff like this, people.