How I Built and Published My First Java Package - Numsy

Table of Contents

• What is Numsy?

• Step‑by‑Step: Building the Package

  • 1.Generate a Maven Project

  • 2.Implement the Utility Class

• Publishing to GitHub Packages

  • 3.Set Up pom.xml

  • 4.Authenticate with GitHub

  • 5.Deploy the Package

• Using the Numsy Package in Other Projects

• Final Thoughts

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Recently, I built a small nut useful java utility package called Numsy, and published it to Github Packages. Here’s a quick walkthrough of how I did it, step-by-step . Hope it helps you are planning to publish your package!

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What is Numsy ?

Numsy is a lightweight Java utility library for basic number manipulation, formatting, and checks.

Currently it supports :

• Check if Number is Even or Odd

• Check if Number is Prime or Not

• Find Prime Number within a range.

• Number formatting- Add Commas

• Find GCD

• Find LCM

it’s nothing fancy — Just something useful that java doesn’t offer directly in a clean, reusable way.

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Step-by-Step: Building the Package

1. Generate a maven Project

I used the maven archetype to create the project quickly:

mvn archetype:generate \
  -DgroupId=com.therohitpatwa \
  -DartifactId=Numsy \
  -DarchetypeArtifactId=maven-archetype-quickstart \
  -DinteractiveMode=false

This will create a folder structure like this.

(It will also create test folder, but we won't bother with that for now. also ignore the .gitignore, give it teste of its own medicine 😁)

2.Implement the Utility class

In src/main/java/com/therohitpatwa/Numsy Numsy.java, I added some static method:

public static Boolean isEven(int n) { ... }
public static Boolean isOdd(int n) { ... }
public static List<Integer> primeInRange(int start,int end) { ... }
So on...

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Publishing to GitHub Packages

3.Set Up pom.xml

I updated my pom.xml to include the Github packages repository under distributionManagement.

<distributionManagement>
  <repository>
    <id>github</id>
    <name>GitHub Packages</name>
    <url>https://maven.pkg.github.com/Github_Username/textee</url>
  </repository>
</distributionManagement>

4.Authenticate with GitHub

In your Maven setting.xml (In ~/.m2/setting.xml file), added my GitHub credentials like this:

<servers>
  <server>
    <id>github</id>
    <username>YOUR_GITHUB_USERNAME</username>
    <password>YOUR_PERSONAL_ACCESS_TOKEN</password>
  </server>
</servers>

To create YOUR_PERSONAL_ACCESS_TOKEN:

1. go to github.com/settings/tokens

2. Create a Classic Token with these scope enables: write:packages read:packages

3. Create and Paste it in the setting.xml

5.Deploy the Package

Run this command to publish:

mvn clean deploy

You'll see the packages listed under Packages in your GItHub repo if all goes well!

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Using the Numsy Package in Other Projects

In other project’s pom.xml, include the repository and dependency:

<dependencies>
  <dependency>
    <groupId>com.therohitpatwa</groupId>
    <artifactId>numsy</artifactId>
    <version>1.0-SNAPSHOT</version>
  </dependency>
</dependencies>

Now Import com.therohitpatwa.Numsy

and you can use methods provided in Numsy class of numsy

Syntax -Numsy.methodName();

Final Thoughts

I will add more method in Numsy soon. if you would like to use it or contribute, check it out here —
^👉 Numsy