Spring Data Neo4j⚡️RX

Important

This repository of SDN/RX was set to read-only mode. We migrated the project as the successor of the original Spring Data Neo4j to https://github.com/spring-projects/spring-data-neo4j. We have moved the issues to the Spring Jira where we also will track the new ones.

Spring Data Neo4j⚡️RX - or in short SDN/RX - is an ongoing effort to create the next generation of Spring Data Neo4j, with full reactive support and lightweight mapping. SDN/RX will work with immutable entities, regardless whether written in Java or Kotlin.

The primary goal of the Spring Data project is to make it easier to build Spring-powered applications that use new data access technologies such as non-relational databases, map-reduce frameworks, and cloud based data services.

The SDN/RX project aims to provide a familiar and consistent Spring-based programming model for integrating with the Neo4j Graph Database.

Manual

For a gentle introduction and some getting started guides, please use our Manual.

Getting Started

Here is a quick teaser of a reactive application using Spring Data Repositories in Java:

@Node
public class Person {
    private Long id;
    private String name;

    public Person(String name) {
        this.name = name;
    }
}

@Repository
interface PersonRepository extends ReactiveNeo4jRepository<Person, Long> {

    Flux<Person> findAllByName(String name);

    Flux<Person> findAllByNameLike(String name);
}

@Service
class MyService {

    @Autowired
    private final PersonRepository repository;

    @Transactional
    public Flux<Person> doWork() {

        Person emil = new Person("Emil");
        Person gerrit = new Person("Gerrit");
        Person michael = new Person("Michael");

        // Persist entities and relationships to graph database
        return repository.saveAll(Flux.just(emil, gerrit, michael));
    }
}

Tip	SDN/RX is not only about reactive support, all features are available in both ways: Imperative and reactive, we only prefer to showcase the new reactive database access support here.

Maven configuration

With Spring Boot

If you are on Spring Boot, all you have to do is to add our starter:

<dependency>
	<groupId>org.neo4j.springframework.data</groupId>
	<artifactId>spring-data-neo4j-rx-spring-boot-starter</artifactId>
	<version>1.1.1</version>
</dependency>

and configure your database connection:

org.neo4j.driver.uri=bolt://localhost:7687
org.neo4j.driver.authentication.username=neo4j
org.neo4j.driver.authentication.password=secret

Please have a look at our manual for an overview about the architecture, how to define mappings and more.

Without Spring Boot

If you are using a plain Spring Framework project without Spring Boot, please add this Maven dependency:

<dependency>
	<groupId>org.neo4j.springframework.data</groupId>
	<artifactId>spring-data-neo4j-rx</artifactId>
	<version>1.1.1</version>
</dependency>

and configure SDN/RX for reactive database access like this:

@Configuration
@EnableReactiveNeo4jRepositories
@EnableTransactionManagement
class MyConfiguration extends AbstractReactiveNeo4jConfig {

    @Bean
    public Driver driver() {
        return GraphDatabase.driver("bolt://localhost:7687", AuthTokens.basic("neo4j", "secret"));
    }

    @Override
    protected Collection<String> getMappingBasePackages() {
        return Collections.singletonList(Person.class.getPackage().getName());
    }
}

The imperative version looks pretty much the same but uses EnableNeo4jRepositories and AbstractNeo4jConfig.

Important

We recommend Spring Boot, the automatic configuration and especially the dependency management through the Starters in contrast to the manual work of managing dependencies and configuration. Please consult our manual for more information.

Building SDN/RX

Please have a look at the documentation: Building SDN/RX.