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Editorial Team
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Asked: 2026-06-01T02:58:15+00:00

I accidentally deleted node 0, which was my reference node on a new graph,

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I accidentally deleted node 0, which was my reference node on a new graph, so calls to getReferenceNode() would fail afterwards. I searched through the Neo4j source and found a that I could recreate it using:

GraphDatabaseService graphDb = new EmbeddedGraphDatabase("mytestdb");    
((EmbeddedGraphDatabase) graphDb).getConfig().getGraphDbModule().createNewReferenceNode();

Am I missing a better way to recreate the reference node? Sometimes it gets an id of 0, sometimes 5 when I run this, depending on what other nodes exist. Also, comments around getConfig() say that it may be removed in future releases.

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1 Answer

  1. Editorial Team

    Some time has passed since you asked this, but for your information there was some semi-recent discussion about reference nodes in a Neo4j GitHub issue – in summary, Peter Neubauer (Neo Technology employee) discusses either removing the concept of reference nodes, or adding a setReferenceNode() API call.

    There doesn’t seem much conclusion from that thread, but to answer your question literally, right now you’re not missing a better way to recreate the reference node – hopefully one will be coming soon!

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