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Graph-Neo4J

A JNoSQL Artemis project with Java SE using using Graph API with Neo4J.

Neo4J Project

Neo4j is a graph database management system developed by Neo4j, Inc. Described by its developers as an ACID-compliant transactional database with native graph storage and processing, Neo4j is the most popular graph database according to db-engines.com. Neo4j is available in a GPL3-licensed open-source "community edition", with online backup and high availability extensions licensed under the terms of the Affero General Public License. Neo also licenses Neo4j with these extensions under closed-source commercial terms. Neo4j is implemented in Java and accessible from software written in other languages using the Cypher Query Language through a transactional HTTP endpoint, or through the binary 'bolt' protocol.

To run this project a nEO4j instance is required, so you can use either a local installation or using Docker.

Check the code

This part has two configuration files and four classes

  • src/main/resources/META-INF/beans.xml: CDI configuration file

  • src/main/resources/META-INF/jnosql.json: Database connection configuration file

  • org.jnosql.demo.graph.infrastructure.DriverProducer This is the Configuration class that connects to Neo4J database. It has three attributes:

     private static final String URL = "bolt://localhost:7687";
 private static final String USER = "neo4j";
 private static final String PASSWORD = "admin";

  • org.jnosql.demo.graph.GraphProducer:

  • org.jnosql.demo.graph.Person: This class is a org.jnosql.artemis.Entity to model a Person

  • org.jnosql.demo.graph.App: This class will be used to make the exercises.

    • This class creates and persist into Neo4J four persons: Banner, Natalia, Rose and Tony. Each person is created with some attributes:

       graph.insert(Person.builder().withAge(30L).withName("Banner").withOccupation("Developer").withSalary(3_000D).build());

    • With next line the datas are commited into the database

       thinkerpop.tx().commit();

    • Then different relationships are added between them

       graph.edge(Tony, "knows", rose).add("feel", "love");

    • Finally we can perform question to the database

       List<Person> developers = graph.getTraversalVertex().has("occupation", "Developer").<Person>stream().collect(toList());

Start the workshop

  1. Run the Neo4J Docker instance

    docker run -d -p 7474:7474 -p 7687:7687 neo4j

    Go to http://localhost:7474/browser/ log in with the user neo4j the default password is neo4j, and set new password to admin,

  2. Compile the project via Maven

    mvn compile

  3. Run the project via Maven

    mvn exec:java -Dexec.mainClass="org.jnosql.demo.graph.App"

Time to practice

Now, It is time you explore the code: add new persons, more relationships, and create new queries. Also you can try to an create your own entities that can be used to respond some questions, next some ideas:

  • Find Beginner Java Users that know Advanced Java User(s).
  • Find Java Users in a given City
  • Recommend Advanced Java Users in the same City as a given User.