My Maven Project

A basic Java Maven project with a simple main class and test setup.

Building the project

To build the project, run:

mvn clean package

Running the application

After building, you can run the application with:

java -cp target/my-app-1.0-SNAPSHOT.jar com.example.App

Running tests

To run the tests:

mvn test

Download java doc and source documentation

mvn dependency:sources dependency:resolve -Dclassifier=javadoc

Neo4j

Query the database in browser interface

Neo4j browser interface url: http://localhost:7474

In the browser interface the following query can be used to query all data for display in table, text, code, or graph:

MATCH (n)-[r]->(m) RETURN *

Installation on Ubuntu

1. First, create the installation directory and download the Neo4j key:

# Create directory for Neo4j installation files
mkdir -p neo4j_install
cd neo4j_install
wget https://debian.neo4j.com/neotechnology.gpg.key
cd ..

2. Create an installation script e.g., install-neo4j-ubuntu.sh and add following content:

# Content of install-neo4j-ubuntu.sh
# Create directory for Neo4j installation files, change directory and download the Neo4j key
mkdir -p neo4j_install && cd neo4j_install && wget https://debian.neo4j.com/neotechnology.gpg.key

# Add the key to apt
sudo apt-key add neo4j_install/neotechnology.gpg.key

# Add the Neo4j repository
echo 'deb https://debian.neo4j.com stable latest' | sudo tee /etc/apt/sources.list.d/neo4j.list

# Update package list
sudo apt-get update

# Install Neo4j
sudo apt-get install neo4j

# Start Neo4j service
sudo systemctl start neo4j

# Enable Neo4j to start on boot
sudo systemctl enable neo4j

3. Make the script executable (if necessary), and run it:

chmod +x install-neo4j-ubuntu.sh
./install-neo4j-ubuntu.sh

4. Initial Database Setup To set up the database first time, Exec: cypher-shell -u neo4j -p neo4j

To enter neo4j shell exec: cypher-shell -u 'neo4j' -p 'password' where -u sets the user and -p the password

5. Verify the installation:

# Check Neo4j service status
sudo systemctl status neo4j

# Check Neo4j version
neo4j --version

Data Directories

Data directory: Default location: /var/lib/neo4j/data Logs: /var/log/neo4j

Ports used by Neo4j

7474: HTTP port for Neo4j Browser 7687: Bolt port for database connections (used by the Java application)

Configuration Setup to connect to the database from the Java application

After installation create file Neo4jConfig.java in folder src/main/java/com/sdg/graph/ with the following content:

package com.sdg.graph;

public class Neo4jConfig {
    private Neo4jConfig() {
        throw new IllegalStateException("Cannot instantiate this class");
    }

    public static final String DB_URI = "bolt://localhost:7687";
    public static final String DB_USER = "neo4j";
    public static final String DB_PASSWORD = "your-password";  // Replace with the password you set
}

// TODO add Windows installation steps

Python Microservice & Java Client

Intall Python modules and dependencies

pip install -r src/main/python/requirements.txt

Run the python service

python src/main/python/microservice/multiply_service.py