neo4j-driver-java-skill

Q: How do I install neo4j-driver-java-skill?

Run npx skills add https://github.com/neo4j-contrib/neo4j-skills --skill neo4j-driver-java-skill in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/neo4j-driver-java-skill/ (personal) or .claude/skills/neo4j-driver-java-skill/ (project).

by neo4j-contribBackend & APIs

Neo4j Java Driver v6 — driver lifecycle, Maven/Gradle setup, executableQuery, executeRead/Write managed transactions, explicit transactions, async/reactive patterns, error handling, data type mapping, connection pool tuning, causal consistency/bookmarks. Use when writing Java or Kotlin code that connects to Neo4j via GraphDatabase.driver, executableQuery, SessionConfig, executeRead, executeWrite, or TransactionCallback. Does NOT handle Cypher authoring — use neo4j-cypher-skill. Does NOT cover driver version upgrades — use neo4j-migration-skill. Does NOT cover Spring Data Neo4j (@Node, Neo4jRepository) — use neo4j-spring-data-skill.

Installs: 777
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/neo4j-contrib/neo4j-skills --skill neo4j-driver-java-skill

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads neo4j-driver-java-skill automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

When to Use

Java/Kotlin code connecting to Neo4j (Aura or self-managed)
Setting up driver, sessions, transactions in Maven/Gradle projects
Debugging result handling, error recovery, connection pool issues
Async (CompletableFuture) or reactive (Project Reactor / RxJava) Neo4j access

When NOT to Use

Cypher query authoring/optimization → neo4j-cypher-skill
Driver version upgrades → neo4j-migration-skill
Spring Data Neo4j (@Node, @Relationship, Neo4jRepository) → neo4j-spring-data-skill

Dependency

Maven

<dependency>
    <groupId>org.neo4j.driver</groupId>
    <artifactId>neo4j-java-driver</artifactId>
    <version>6.3.0</version>
</dependency>

Gradle

implementation 'org.neo4j.driver:neo4j-java-driver:6.3.0'

Check latest: https://central.sonatype.com/artifact/org.neo4j.driver/neo4j-java-driver

6.2.0 [2026-06]: Neo4j UUID type + Bolt 6.1 support; QueryProfile in result summary. 6.2.1 [2026-08]: fixes Value#asObject() on UUID values — required if reading UUID properties generically. Neo4j 2026.08 server bundles 6.2.1; 2026.07 bundles 6.2.0. 6.3.0 [2026-09]: Property Encryption preview — client-side envelope encryption of property values (driver.propertyEncryption()) → references/property-encryption.md.

Server-side UUID type and uuid() constructors ship in Neo4j 2026.08 — use driver >= 6.2.1 against those servers.

Environment Variables

Standard pattern for connection config — never hardcode credentials:

String uri      = System.getenv().getOrDefault("NEO4J_URI",      "neo4j://localhost:7687");
String user     = System.getenv().getOrDefault("NEO4J_USERNAME",  "neo4j");
String password = System.getenv().getOrDefault("NEO4J_PASSWORD",  "");
String database = System.getenv().getOrDefault("NEO4J_DATABASE",  "neo4j");

Spring Boot: inject via @Value("${spring.neo4j.uri}") or application.properties:

spring.neo4j.uri=neo4j+s://xxx.databases.neo4j.io
spring.neo4j.authentication.username=neo4j
spring.neo4j.authentication.password=secret

Driver Lifecycle

One Driver per application — thread-safe, expensive to create. Implement AutoCloseable or use try-with-resources.

// Long-lived singleton
var driver = GraphDatabase.driver(
    "neo4j+s://xxx.databases.neo4j.io",          // Aura TLS+routing
    AuthTokens.basic(user, password));
driver.verifyConnectivity();                      // fail fast

// Short-lived (tests / CLI)
try (var driver = GraphDatabase.driver(uri, AuthTokens.basic(user, password))) {
    driver.verifyConnectivity();
    // ...
}

URI schemes:

URI	Use
`neo4j://localhost`	Unencrypted, cluster routing
`neo4j+s://xxx.databases.neo4j.io`	TLS + cluster routing (Aura)
`bolt://localhost:7687`	Unencrypted, single instance
`bolt+s://localhost:7687`	TLS, single instance

Auth options: AuthTokens.basic(u,p) · AuthTokens.bearer(token) · AuthTokens.kerberos(b64) · AuthTokens.none()

Choosing the Right API

API	When	Auto-retry	Streaming
`driver.executableQuery()`	Default for most queries	✅	❌ eager
`session.executeRead/Write()`	Large results, callback control	✅	✅
`session.beginTransaction()`	Multi-method, external coordination	❌	✅
`session.run()`	Self-managing queries (`CALL IN TRANSACTIONS`)	⚠️ one-shot [6.1+]	✅
`driver.asyncSession()`	Non-blocking `CompletableFuture`	✅	✅
`driver.rxSession()`	Reactor/RxJava backpressure	✅	✅

CALL { … } IN TRANSACTIONS and USING PERIODIC COMMIT self-manage their transaction — use session.run() only. executableQuery and executeRead/Write will fail for these queries.

session.run() retry [6.1+]: single immediate retry on idempotent errors only (enabled by default). Disable per driver or per session:

// Driver-level — disable for all sessions
var config = Config.builder().withAutoCommitRetriesDisabled(true).build();

// Session-level — overrides driver
var sessionConfig = SessionConfig.builder()
    .withAutoCommitRetriesMode(AutoCommitRetriesMode.DISABLED)  // DEFAULT = follow driver
    .build();

`executableQuery` — Default

// Read — route to replicas
var result = driver.executableQuery("""
        MATCH (p:Person {name: $name})-[:KNOWS]->(friend)
        RETURN friend.name AS name
        """)
    .withParameters(Map.of("name", "Alice"))
    .withConfig(QueryConfig.builder()
        .withDatabase("neo4j")            // always specify — avoids home-db round-trip
        .withRouting(RoutingControl.READ)
        .build())
    .execute();

result.records().forEach(r -> System.out.println(r.get("name").asString()));
long ms = result.summary().resultAvailableAfter(TimeUnit.MILLISECONDS);

// Write
driver.executableQuery("CREATE (p:Person {name: $name, age: $age})")
    .withParameters(Map.of("name", "Bob", "age", 30))
    .withConfig(QueryConfig.builder().withDatabase("neo4j").build())
    .execute();

Never string-interpolate Cypher. Always .withParameters(Map.of(...)).

Managed Transactions (`executeRead` / `executeWrite`)

Sessions are NOT thread-safe — one per request/thread, always close.

try (var session = driver.session(SessionConfig.builder()
        .withDatabase("neo4j").build())) {

    // Read → replica routing
    var names = session.executeRead(tx -> {
        var result = tx.run(
            "MATCH (p:Person) WHERE p.name STARTS WITH $prefix RETURN p.name AS name",
            Map.of("prefix", "Al"));
        return result.stream().map(r -> r.get("name").asString()).toList(); // collect INSIDE
    });

    // Write → leader routing
    session.executeWriteWithoutResult(tx ->
        tx.run("CREATE (p:Person {name: $name})", Map.of("name", "Carol"))
    );
}

Result must be consumed INSIDE the callback

Result is a lazy cursor tied to the open transaction. Transaction closes when callback returns — any read after that throws ResultConsumedException.

// ❌ Returns Result — already closed by the time caller uses it
var result = session.executeRead(tx ->
    tx.run("MATCH (p:Person) RETURN p.name AS name"));
result.stream().forEach(...); // throws ResultConsumedException

// ✅ Collect to List inside callback
var names = session.executeRead(tx ->
    tx.run("MATCH (p:Person) RETURN p.name AS name")
      .stream().map(r -> r.get("name").asString()).toList());

Callback rules

Consume each Result before next tx.run() — multiple open cursors = undefined behaviour.
No side effects (HTTP, email, metric increments) — callback may be retried on transient errors.
Use MERGE (idempotent), not CREATE, for retry-safe writes.
executeRead → replica; executeWrite → leader.

TransactionConfig — timeouts & metadata

var config = TransactionConfig.builder()
    .withTimeout(Duration.ofSeconds(5))
    .withMetadata(Map.of("app", "myService", "user", userId))  // visible in SHOW TRANSACTIONS
    .build();
session.executeRead(tx -> { /* ... */ }, config);

Explicit Transactions

Use when work spans multiple methods or requires external coordination. Not auto-retried.

try (var session = driver.session(SessionConfig.builder().withDatabase("neo4j").build())) {
    var tx = session.beginTransaction();
    try {
        doPartA(tx);
        doPartB(tx);
        tx.commit();
    } catch (Exception e) {
        try { tx.rollback(); } catch (Exception rb) { e.addSuppressed(rb); }
        throw e;
    }
}

tx.rollback() is a network call — wrap in its own try/catch and use addSuppressed so the original exception is not lost.

Commit uncertainty: if tx.commit() throws ServiceUnavailableException, the commit may or may not have succeeded. Design writes as idempotent (MERGE + unique constraints) so retrying is safe.

Choose explicit vs managed:

Auto-retry needed → executeRead / executeWrite
Work spans multiple methods → explicit (pass tx as parameter)
Coordinating with external I/O → explicit (commit only after I/O succeeds)

Error Handling

try {
    driver.executableQuery("...").execute();
} catch (ServiceUnavailableException e) {
    // No servers — check connection
} catch (SessionExpiredException e) {
    // Server closed session — open new one
} catch (TransientException e) {
    // Managed txns retry automatically; explicit txns need manual retry
} catch (Neo4jException e) {
    // Cypher/constraint error — e.code() gives GQL status code
}

Managed transactions auto-retry TransientException — no catch needed.

Data Types & Value Extraction

Cypher type	Java accessor
`Integer`	`value.asLong()` / `value.asInt()`
`Float`	`value.asDouble()`
`String`	`value.asString()`
`Boolean`	`value.asBoolean()`
`List`	`value.asList()`
`Map`	`value.asMap()`
`Node`	`value.asNode()`
`Relationship`	`value.asRelationship()`
`Date`	`value.asLocalDate()`
`DateTime`	`value.asZonedDateTime()`
`UUID`	`value.asUUID()` → `java.util.UUID` [6.2+, Neo4j 2026.08+]

var record = result.records().get(0);
String name = record.get("name").asString();
long age    = record.get("age").asLong();

var node = record.get("p").asNode();
String label = node.labels().iterator().next();
Map<String,Object> props = node.asMap();

Null safety — two distinct cases

Situation	`record.get(key)`	`.asString()`
Key present, value non-null	the value	returns string
Key present, value is graph null	`Value` where `.isNull()` = true	throws `Uncoercible`
Key absent (typo / not projected)	`Value.NULL` sentinel	throws `NoSuchElementException`

// Graph null — use default overload (safe only if key is always projected):
String city = record.get("city").asString("Unknown");

// Absent key — check containsKey first:
if (record.containsKey("city") && !record.get("city").isNull()) {
    String city = record.get("city").asString();
}

Object Mapping

Map query results to Java records/classes directly — eliminates manual accessor calls.

// Domain record — field names match RETURN aliases (case-sensitive)
public record Person(String name, long age) {}

// Map single record
var person = driver.executableQuery("MATCH (p:Person {name: $name}) RETURN p.name AS name, p.age AS age")
    .withParameters(Map.of("name", "Alice"))
    .withConfig(QueryConfig.builder().withDatabase("neo4j").build())
    .execute()
    .records()
    .stream()
    .map(r -> r.get("name").asString())   // or: r.as(Person.class) — see note
    .findFirst()
    .orElseThrow();

// Using .as(Person.class) — maps RETURN keys to record fields by name
var person2 = driver.executableQuery("""
        MATCH (p:Person {name: $name})
        RETURN p.name AS name, p.age AS age
        """)
    .withParameters(Map.of("name", "Tom Hanks"))
    .withConfig(QueryConfig.builder().withDatabase("neo4j").build())
    .execute()
    .records()
    .stream()
    .map(record -> record.get("p").as(Person.class))
    .findFirst()
    .orElseThrow(() -> new RuntimeException("Person not found"));

Nested mapping — return a map projection and include COLLECT {} for lists:

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

var movieCypher = """
    MATCH (movie:Movie)
    LIMIT 1
    RETURN movie {
        .title,
        actors: COLLECT {
            MATCH (actor:Person)-[:ACTED_IN]->(movie)
            RETURN actor
        }
    }
    """;

var movie = driver.executableQuery(movieCypher)
    .withConfig(QueryConfig.builder().withDatabase("neo4j").build())
    .execute()
    .records()
    .stream()
    .map(r -> r.get("movie").as(Movie.class))
    .findFirst()
    .orElseThrow();

Only mapped properties defined in the record are populated — extra properties returned by Cypher are ignored.

Performance Patterns

Always specify database — omitting triggers home-db round-trip on every call.

Route reads to replicas — RoutingControl.READ in QueryConfig or use executeRead.

Batch writes with UNWIND — pass List<Map<String,Object>> (plain maps only; custom objects fail):

List<Map<String, Object>> rows = people.stream()
    .map(p -> Map.<String, Object>of("name", p.name(), "age", p.age()))
    .toList();

driver.executableQuery("UNWIND $items AS item MERGE (p:Person {name: item.name}) SET p.age = item.age")
    .withParameters(Map.of("items", rows))
    .withConfig(QueryConfig.builder().withDatabase("neo4j").build())
    .execute();

Allowed leaf types in parameter maps: String, Long/Integer/Short/Byte, Double/Float, Boolean, List<?>, Map<String,?>, null. Custom objects and LocalDate must be converted first.

Group writes in one transaction — one executeWrite with a loop, not one executeWrite per iteration.

Connection pool — default 100 connections. Tune if exhausted:

Config.builder()
    .withMaxConnectionPoolSize(50)
    .withConnectionAcquisitionTimeout(30, TimeUnit.SECONDS)
    .build()

Common Errors

Mistake	Fix
String-interpolate Cypher params	`.withParameters(Map.of(...))` always
Omit database name	Set in `QueryConfig` / `SessionConfig` every time
New `Driver` per request	Create once at startup; share everywhere
Share `Session` across threads	One session per request/thread
Return `Result` from tx callback	Collect to `List`/`Map` inside callback
Leave `Result` open before next `tx.run()`	Consume before next call
Side effects in managed tx callback	Move outside — callback may retry
Pass custom objects to UNWIND params	Convert to `List<Map<String,Object>>`
`asString()` on graph null	`.asString("default")` or check `.isNull()`
`asString()` on absent key	`containsKey()` before optional access
Naked `tx.rollback()` in catch	Wrap in try/catch; use `addSuppressed`
Assume `commit()` failure = no commit	Commit uncertainty — design writes idempotent
Block inside async callback (`.join()`)	Chain with `thenCompose`
Skip session close in async error path	`exceptionallyCompose` to close then re-throw
One transaction per write in loop	Batch with `UNWIND` or group in one callback
`executeWrite` for a read	Use `executeRead` — routes to replica

References

Load on demand:

references/async-reactive.md — full async CompletableFuture patterns, reactive RxSession with Flux.usingWhen, deadlock avoidance
references/property-encryption.md — Property Encryption preview [6.3.0+]: envelope profile, key encapsulation services (local, AWS KMS, Azure Key Vault, GCP KMS), key manager, encrypt/decrypt with AAD
references/advanced-config.md — full Config.builder() options, TLS, notification filtering, session-level auth, user impersonation, cross-session bookmarks, spatial types (Values.point/WGS-84/Cartesian)

Docs:

Java Driver manual: https://neo4j.com/docs/java-manual/current/
API reference: https://neo4j.com/docs/api/java-driver/current/

Checklist

FAQ

What does the neo4j-driver-java-skill skill do?

How do I install neo4j-driver-java-skill?

Run npx skills add https://github.com/neo4j-contrib/neo4j-skills --skill neo4j-driver-java-skill in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/neo4j-driver-java-skill/ (personal) or .claude/skills/neo4j-driver-java-skill/ (project).

Which AI agents can use neo4j-driver-java-skill?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is neo4j-driver-java-skill safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains neo4j-driver-java-skill?

It is published by neo4j-contrib in neo4j-contrib/neo4j-skills. It has 777 recorded installs.

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neo4j-driver-java-skill

Install

Install

Describe the task

Review the result

SKILL.md

When to Use

When NOT to Use

Dependency

Maven

Gradle

Environment Variables

Driver Lifecycle

Choosing the Right API

executableQuery — Default

Managed Transactions (executeRead / executeWrite)

Result must be consumed INSIDE the callback

Callback rules

TransactionConfig — timeouts & metadata

Explicit Transactions

Error Handling

Data Types & Value Extraction

Null safety — two distinct cases

Object Mapping

Performance Patterns

Common Errors

References

Checklist

FAQ

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`executableQuery` — Default

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