Journal of Seun Matt and his expertise

Latest Articles

December 7, 2024 6 minutes read

Career Development

Two Years at Cellulant - My 2024 Career Recap

2024 is a unique and eventful year. Weddings, babies, dealing with legacy systems. A lot of things happen that impacted my career. In this recap, I narrated the challenges, victories and lessons of 2024 that will continue to shape me as an Engineering leader

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October 12, 2024 12 minutes read

Java
SpringBoot

Introduction to Spring Boot

A beginner-friendly guide to Spring Boot, covering project setup, structure, and the use of MVC patterns. Ideal for developers looking to build cloud-native web applications with minimal configuration.

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September 2, 2024 1 minute read

Java
SpringBoot
Video

How to use HTML templates in a Spring Boot application + Freemarker Template Engine

In this video tutorial, we will learn how to find and use free HTML/CSS templates to create stunning user interfaces for a Spring Boot application.

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August 26, 2024 6 minutes read

Java
SpringBoot

How to Automatically Encrypt Sensitive Information in Database Columns

Learn how to automatically encrypt and decrypt sensitive data in your Spring Boot application using AES encryption and JPA Attribute Converters. Protect API keys, client secrets, and other sensitive information stored in your database

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August 10, 2024 10 minutes read

Java
SpringBoot

How to Implement HMAC Signature in Spring Boot for Secure API Requests

Learn how to implement HMAC signature in a Spring Boot application to secure API requests. This step-by-step guide covers project setup, integrating HMAC with Spring Security, and testing with Java.

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July 21, 2024 5 minutes read

Java

How to Encrypt and Decrypt Data using AES in Java

Advanced Encryption Standard (AES) is a fast, symmetric encryption algorithm. In this tutorial, we will learn how to encrypt plain data, convert it to Base64, and decrypt it in Java

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March 9, 2024 2 minutes read

Java
SpringBoot
Video

Environment Variables in Spring Boot Properties: Override default values using Environment variables

Learn how to use environment variables in Spring Boot application properties files to override the configured default values like a pro in 10 minutes.

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January 28, 2024 4 minutes read

Java

How to Encrypt and Decrypt Data using RSA in Java

A practical guide on how to encrypt and decrypt data using the RSA algorithm in Java. We will also see how we can generate an RSA key pair and convert it to and from Base64

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January 21, 2024 9 minutes read

Java
SpringBoot
Spring Security

Spring Boot API Key Authentication

This article shows how to create a Spring Boot app that requires API key for an endpoint using Spring Security. We also demonstrate how to combine this with other authentication mechanisms in the same codebase.

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January 7, 2024 4 minutes read