How to Access Cosmos DB Gremlin API Using Java or Kotlin Similar to Spring Data?

Question

How can I access the Cosmos DB Gremlin API from Java or Kotlin in a way that resembles Spring Data?

// Example Java code to access Cosmos DB Gremlin API using Gremlin Driver
import org.apache.tinkerpop.gremlin.driver.Cluster;
import org.apache.tinkerpop.gremlin.driver.Client;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__;

public class GremlinExample {
    public static void main(String[] args) {
        Cluster cluster = Cluster.build("<COSMOS_DB_ENDPOINT>").port(<PORT>).create();
        Client client = cluster.connect();

        // Use Gremlin to access and manipulate your data
        String gremlinQuery = "g.V().hasLabel('person')";
        List<ResultSet> results = client.submit(gremlinQuery).all().get();

        // Process results
        results.forEach(result -> System.out.println(result));
        cluster.close();
    }
}

Answer

Accessing the Cosmos DB Gremlin API from Java or Kotlin can be streamlined using the Gremlin Driver, which allows you to perform graph queries easily. Although Spring Data doesn't officially support the Gremlin API, you can achieve similar results by manually integrating the Gremlin Driver into your application. This guide explores the steps to set up a connection and run queries.

// Example Kotlin code to access Cosmos DB Gremlin API using Gremlin Driver
import org.apache.tinkerpop.gremlin.driver.Cluster
import org.apache.tinkerpop.gremlin.driver.Client

fun main() {
    val cluster = Cluster.build("<COSMOS_DB_ENDPOINT>").port(<PORT>).create()
    val client: Client = cluster.connect()

    // Example Gremlin query
    val gremlinQuery = "g.V().hasLabel('person')"
    val results = client.submit(gremlinQuery).all().get()

    // Process results
    results.forEach { println(it) }
    cluster.close()
}

Causes

Lack of native Spring Data support for Gremlin API.
Need for custom integration with Cosmos DB.

Solutions

Use the Apache TinkerPop Gremlin Driver for Java to connect to Cosmos DB.
Write custom repositories to handle your graph queries.

Common Mistakes

Mistake: Not handling connection errors.

Solution: Implement try-catch blocks around your connection logic.

Mistake: Hardcoding sensitive information such as database credentials.

Solution: Use environment variables or configuration files to manage sensitive data.

Helpers

Cosmos DB
Gremlin API
Java
Kotlin
Spring Data
Apache TinkerPop
graph database
Azure Cosmos DB