Neo4j Embedded Example

GraphApplication.java

package myapp;

import java.io.IOException;
import java.nio.file.Path;
import java.util.List;
import java.util.Map;

import org.neo4j.configuration.GraphDatabaseSettings;
import org.neo4j.configuration.GraphDatabaseSettings.LogQueryLevel;
import org.neo4j.configuration.connectors.BoltConnector;
import org.neo4j.configuration.helpers.SocketAddress;
import org.neo4j.dbms.api.DatabaseManagementServiceBuilder;
import org.neo4j.dbms.api.DatabaseManagementService;
import org.neo4j.driver.AuthTokens;
import org.neo4j.driver.GraphDatabase;
import org.neo4j.driver.TransactionContext;

public class GraphApplication {

	public static void main(String... a) throws IOException {

		// This is the db itself, should be long-lived
		var graphDb = new DatabaseManagementServiceBuilder(Path.of("target","mydb"))
			.setConfig(BoltConnector.enabled, true)
			.setConfig(BoltConnector.listen_address, new SocketAddress("localhost", 7687))
			.setConfig(BoltConnector.encryption_level, BoltConnector.EncryptionLevel.DISABLED)
			.setConfig(GraphDatabaseSettings.log_queries, LogQueryLevel.VERBOSE)
			.build();
		registerShutdownHook(graphDb);
		// You could also use the graph database api and skip using bolt.
		// The advantage of using build also in an embedded scenario: You can switch to a server with ease.
		// Same goes for the driver with the connection pool
		// The session itself is short-lived
		try (
			var driver = GraphDatabase.driver("bolt://localhost:7687", AuthTokens.none());
			var session = driver.session()
		) {
			session.executeWrite(t -> t.run("CREATE (p:Person {name: 'Arnold Schwarzenegger'}) - [:ACTED_IN] -> (:Movie {title: 'The Terminator'})").consume().counters().nodesCreated());
			var movies = session.executeRead(GraphApplication::findMovieAndTheirActors);
			movies.forEach(System.out::println);
		}

		// graphDb.shutdown();
	}

	record Person(String name) {
	}

	record Movie(String title, List<Person>actedIn) {
	}

	static List<Movie> findMovieAndTheirActors(TransactionContext tx) {

		var query = """
			MATCH (m:Movie) <- [:ACTED_IN] - (p:Person)
			WHERE m.title =~ $movieTitle
			RETURN m.title AS title, collect(p.name) AS actors
			""";

		return tx.run(query, Map.of("movieTitle", ".*The.*")).list(r -> {

			var actors = r.get("actors").asList(v -> new Person(v.asString()));
			return new Movie(r.get("title").asString(), actors);
		});
	}
	
	private static void registerShutdownHook( final DatabaseManagementService managementService ) {
    // Registers a shutdown hook for the Neo4j instance so that it
    // shuts down nicely when the VM exits (even if you "Ctrl-C" the
    // running application).
    Runtime.getRuntime().addShutdownHook( new Thread()
    {
	@Override
	public void run() {
	    System.out.println("Shutdown requested, please wait 3 seconds...");
	    managementService.shutdown();
	    System.out.println("Shutdown completed successfully.");
	}
    } );
}
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
		 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>somegroup</groupId>
	<artifactId>someapp</artifactId>
	<version>1.0-SNAPSHOT</version>

	<properties>
		<maven.compiler.release>17</maven.compiler.release>

		<neo4j.version>5.11.0</neo4j.version>
		<neo4j-java-driver.version>5.11.0</neo4j-java-driver.version>
		<exec.mainClass>myapp.GraphApplication</exec.mainClass>
	</properties>

	<dependencies>
		<!-- Embbeded instance -->
		<dependency>
			<groupId>org.neo4j</groupId>
			<artifactId>neo4j</artifactId>
			<version>${neo4j.version}</version>
		</dependency>
		<dependency>
			<groupId>org.neo4j</groupId>
			<artifactId>neo4j-bolt</artifactId>
			<version>${neo4j.version}</version>
		</dependency>

		<!-- Driver (for connection) -->
		<dependency>
			<groupId>org.neo4j.driver</groupId>
			<artifactId>neo4j-java-driver</artifactId>
			<version>${neo4j-java-driver.version}</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.11.0</version>
			</plugin>
		</plugins>
	</build>
</project>

To download and run execute in empty dir:

mkdir src/main/java/myapp
curl -L -O 'https://gist.github.com/Podbrushkin/855bf73fca135ef6a4a0ee532f462f6b/raw/8f6d9142c6f97a1844728e8f387dbbce602fa684/pom.xml'
curl -L 'https://gist.github.com/Podbrushkin/855bf73fca135ef6a4a0ee532f462f6b/raw/8f6d9142c6f97a1844728e8f387dbbce602fa684/GraphApplication.java' > .\src\main\java\myapp\GraphApplication.java
mvn clean compile exec:java

It doesn't actually log queries.