docker-compose.yml

version: '3'

networks:
  gaia:
    driver: bridge

services:
#  gaia-postgres:
#    container_name: gaia-postgres
#    image: postgres:latest
#    restart: always
#    volumes:
#      - ./db/postgres:/db
#    ports:
#      - 5432:5432
#    environment:
#      POSTGRES_PASSWORD: example
#      PGDATA: /db
#      POSTGRES_DB: gaia
#
#    networks:
#      - gaia

  gaia-neo4j:
    container_name: gaia-neo4j
    image: neo4j:latest
    ports:
      - 7474:7474
      - 7687:7687
    volumes:
      - ./db/neo4j:/data
      - ./config/db:/conf
    environment:
      NEO4J_AUTH: none
    networks:
      - gaia

  gaia-nginx:
    container_name: gaia-nginx
    image: nginx:latest
    volumes:
      - ./static/dist:/static:ro
      - ./config/nginx:/etc/nginx:ro
    ports:
      - 8000:80
    networks:
      - gaia


  gaia:
    container_name: gaia
    image: openjdk:8-jdk-alpine
    depends_on:
#      - gaia-postgres
      - gaia-nginx
      - gaia-neo4j
    ports:
      - 8100:8080
    volumes:
      - .:/src
      - ~/.gradle:/root/.gradle
    working_dir: /src
    command: './gradlew bootRun'

    networks:
      - gaia

neo4j.conf

For what it's worth, I've tried various combinations of gaia instead of 0.0.0.0

dbms.security.auth_enabled=false
dbms.connectors.default_listen_address=0.0.0.0
dbms.connector.bolt.enabled=true
#dbms.connector.bolt.address=0.0.0.0:7687
dbms.connector.bolt.listen_address=0.0.0.0:7687
dbms.connector.bolt.advertised_address=0.0.0.0:7687
dbms.connector.bolt.tls_level=OPTIONAL
dbms.connectors.default_advertised_address=0.0.0.0