Neo4j is a highly scalable, native graph database. Spring Data supports Spring Neo4J for Graph Database: annotated POJOs, SD-Repositories and Neo4j-Template. Tutorial will guides you how to work with Spring Neo4j. Technologies for Spring Neo4j tutorialII. Structure of Project2. Create Spring Boot project2. Add needed dependencies3.

I'm starting a new Spring boot project and I've chosen a neo4j graph database as there is a lot of connected data. I would like to use Reactive Streams in the project as there is a lot of push notifications from the server to the client. I'm looking at using Spring Webflux for this reason.
Apr 07, 2020 Neo4j officially supports drivers for.NET, Java, JavaScript, Go and Python. Thanks to the community, there are significantly more community drivers in addition to these. In this session we will.

Hello friends!!! Here we are going to discuss Spring Boot with NoSQL, how Spring Boot provide the support for NoSQL technologies and how to use into Spring Boot Application. NoSQL is a non-relational database management systems, different from traditional relational database management systems in some significant ways.

NoSQL is nothing but it is database without support of SQL queries unlike traditional databases MySQL, DB2, Oracle etc. Spring Data provides additional projects that help you access a variety of NoSQL technologies including MongoDB, Neo4J, Elasticsearch, Solr, Redis, Gemfire, Couchbase and Cassandra. Spring Boot provides auto-configuration for Redis, MongoDB, Neo4j, Elasticsearch, Solr and Cassandra.

Spring Boot with NoSQL

1. MongoDB

MongoDB is an open-source NoSQL document database that uses a JSON-like schema instead of traditional table-based relational data. Spring Boot offers several conveniences for working with MongoDB, including the spring-boot-starter-data-mongodb ‘Starter’. Spring Data includes repository support for MongoDB.

Spring Boot offers auto-configuration for Embedded Mongo. To use it in your Spring Boot application add a dependency on de.flapdoodle.embed:de.flapdoodle.embed.mongo. The port that Mongo will listen on can be configured using the spring.data.mongodb.port property. To use a randomly allocated free port use a value of zero. The MongoClient created by MongoAutoConfiguration will be automatically configured to use the randomly allocated port.

1.1 Connecting to a MongoDB database

Spring Data Mongo provides a MongoTemplate class that is very similar in its design to Spring’s JdbcTemplate. As with JdbcTemplate Spring Boot auto-configures a bean for you to simply inject:

For MongoDB Full Example Click Here

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2. Neo4j

Neo4j is an open-source NoSQL graph database that uses a rich data model of nodes related by first class relationships which is better suited for connected big data than traditional rdbms approaches. Spring Boot offers several conveniences for working with Neo4j, including the spring-boot-starter-data-neo4j ‘Starter’.

You can configure the user and credentials to use via the spring.data.neo4j.* properties:

2.1 Connecting to a Neo4j database

By default the instance will attempt to connect to a Neo4j server using localhost:7474

2.2 Using the embedded mode

If you add org.neo4j:neo4j-ogm-embedded-driver to the dependencies of your application, Spring Boot will automatically configure an in-process embedded instance of Neo4j that will not persist any data when your application shuts down. You can explicitly disable that mode using spring.data.neo4j.embedded.enabled=false.

2.3 Spring Data Neo4j repositories

Spring Data includes repository support for Neo4j. You can customize entity scanning locations using the @NodeEntityScan annotation.

3. Redis

Redis is a cache, message broker and richly-featured key-value store. Spring Boot offers basic auto-configuration for the Jedis client library and abstractions on top of it provided by Spring Data Redis. There is a spring-boot-starter-data-redis ‘Starter’ for collecting the dependencies in a convenient way.

You can inject an auto-configured RedisConnectionFactory, StringRedisTemplate or vanilla RedisTemplate instance as you would any other Spring Bean. By default the instance will attempt to connect to a Redis server using localhost:6379.

4. Gemfire

Spring Data Gemfire provides convenient Spring-friendly tools for accessing the Pivotal Gemfire data management platform. There is a spring-boot-starter-data-gemfire ‘Starter’ for collecting the dependencies in a convenient way. There is currently no auto-configuration support for Gemfire, but you can enable Spring Data Repositories with a single annotation (@EnableGemfireRepositories).

5. Solr

Apache Solr is a search engine. Spring Boot offers basic auto-configuration for the Solr 5 client library and abstractions on top of it provided by Spring Data Solr. There is a spring-boot-starter-data-solr ‘Starter’ for collecting the dependencies in a convenient way.

You can inject an auto-configured SolrClient instance as you would any other Spring bean. By default the instance will attempt to connect to a server using localhost:8983/solr:

5.1 Spring Data Solr repositories

Spring Data includes repository support for Apache Solr.

6. Elasticsearch

Elasticsearch is an open source, distributed, real-time search and analytics engine. Spring Boot offers basic auto-configuration for the Elasticsearch and abstractions on top of it provided by Spring Data Elasticsearch. There is a spring-boot-starter-data-elasticsearch ‘Starter’ for collecting the dependencies in a convenient way. Spring Boot also supports Jest.

6.1 Connecting to Elasticsearch using Spring Data

You can inject an auto-configured ElasticsearchTemplate or Elasticsearch Client instance as you would any other Spring Bean. By default the instance will embed a local in-memory server (a Node in Elasticsearch terms) and use the current working directory as the home directory for the server.
you can switch to a remote server by setting spring.data.elasticsearch.cluster-nodes to a comma-separated ‘host:port’ list.

Spring Data includes repository support for Elasticsearch.

6.2 Connecting to Elasticsearch using Jest

If you have Jest on the classpath, you can inject an auto-configured JestClient targeting localhost:9200 by default.

7. Cassandra

Cassandra is an open source, distributed database management system designed to handle large amounts of data across many commodity servers. Spring Boot offers auto-configuration for Cassandra and abstractions on top of it provided by Spring Data Cassandra. There is a spring-boot-starter-data-cassandra ‘Starter’ for collecting the dependencies in a convenient way.

7.1 Connecting to Cassandra

You can inject an auto-configured CassandraTemplate or a Cassandra Session instance as you would with any other Spring Bean. The spring.data.cassandra.* properties can be used to customize the connection.

8. Couchbase

Couchbase is an open-source, distributed multi-model NoSQL document-oriented database that is optimized for interactive applications. Spring Boot offers auto-configuration for Couchbase and abstractions on top of it provided by Spring Data Couchbase. There is a spring-boot-starter-data-couchbase ‘Starter’ for collecting the dependencies in a convenient way.

The spring.couchbase.* properties can be used to customize the connection. Generally you will provide the bootstrap hosts, bucket name and password:

Spring Data includes repository support for Couchbase. ou can inject an auto-configured CouchbaseTemplate instance.

Summary

Here we have discussed some detail about

Spring Reactive Neo4j