如何通过 localhost 和 Docker 在 Spring Boot 中通过 Neo4j 计算最短路径？

Question

I have a problem about calculating the shortest path through Neo4j in my Spring Boot example.

After adding some cities with its route, I want to calculate their shortest path in terms of their connection and their duration. However, these two methods which defined in ShortestPathController cannot work.

Here are the issues shown below.

Edited

1 ) I cannot run all test methods in AppApplicationTests.java

org.neo4j.driver.exceptions.AuthenticationException: The client is unauthorized due to authentication failure.

2 ) I have no idea as I cannot run all test methods what if there are many cities and its route like this resource ( Link )

How can I fix it?

Here is my GitHub repository : Project Link

Here is my docker-compose.yml file

version: '3'

services:
  neo4j-db:
    image: neo4j:4.3
    container_name: app-neo4j-db
    ports:
      - 7474:7474
      - 7687:7687
    volumes:
      - $HOME/neo4j/data:/data
      - $HOME/neo4j/logs:/logs
      - $HOME/neo4j/import:/import
      - $HOME/neo4j/plugins:/plugins
    environment:
      NEO4J_AUTH: "neo4j/123456"
      NEO4JLABS_PLUGINS: '["apoc"]'
      NEO4J_dbms_security_procedures_unrestricted: apoc.\\\*,gds.\\\*
      dbms_connector_bolt_listen__address: neo4j-db:7687
      dbms_connector_bolt_advertised__address: neo4j-db:7687
    healthcheck:
      test: cypher-shell --username neo4j --password 123456 'MATCH (n) RETURN COUNT(n);' # Checks if neo4j server is up and running
      interval: 10s
      timeout: 10s
      retries: 5

  app:
    image: 'springbootneo4jshortestpath:latest'
    build:
      context: .
      dockerfile: Dockerfile
    container_name: SpringBootNeo4jShortestPath
    depends_on:
      neo4j-db:
        condition: service_healthy # Wait for neo4j to be ready
    links:
      - neo4j-db
    environment:
      NEO4J_URI: bolt://neo4j-db:7687
      NEO4J_USER: neo4j
      NEO4J_PASSWORD: 123456

volumes:
  app-neo4j-db:

Answer 1

Part 1: This is just a warning. In most cases you would not be happy with unbound relationships because the paths can quickly grow in numbers and the server has to keep all possible combination in memory before you will get it.

Part 2: What @jose_bacoy says. Behind the link are informations about how to add APOC in Desktop, Server or Docker deployment. Test your query (or even a reduced version of it) in the shell/browser to ensure it is activated correctly.

Part 2 (again but different topic): You cannot return PathValue in a repository. If you want to use the Java driver's type, please use SDN's Neo4jClient for interaction. SDN documentation / Neo4jClient

(Edit and added) Docker compose: I could not make it work to provide an array with the other syntax, so basically this will auto-load the plugin on container start. You can check if the APOC library is available via CALL dbms.procedures() in the shell or browser. This is what you should do first .

environment:                                                                                                                                                                                                                                                                        
      - NEO4J_AUTH=neo4j/secret                                                                                                                                                                                                                                                         
      - NEO4JLABS_PLUGINS=["apoc"]                                                                                                                                                                                                                                                      

Answer 2

You need to ensure that APOC library is installed in your Neo4j server. Please follow this installation procedure.

 https://neo4j.com/labs/apoc/4.0/installation/#neo4j-server

Then update your conf file to whitelist that function.