Overview There are times you need to do some start-up work when your Spring application launch. One of the methods is to use the CommandlineRunner interface. In this post, I’m going to show you how to use this interface to run startup tasks with flexibility. Let’s get started. Meet the CommandlineRunner interface The CommandlineRunner interface … Read more
Overview There are times you need to generate a self-signed certificate for your website. One example is for websites in a development environment. My story is recently, I need to set up a Keycloak instance on the internet. Recent versions of Keycloak require HTTPS to log in to admin. In this post, I’m going to … Read more
Overview In this post, I will show you how you can quickly test the email-sending function of your application using MailHog. The application I’m demonstrating is a Spring Boot web app. However, you can use the code in almost all applications. Let’s get started. Setup MailHog MailHog is a fantastic tool for developers to test … Read more
Overview Recently, I did some overhauls for my JavaFX application. The app has a default Java icon on Windows and Linux but for some reason, on my Mac, the icon is a folder. I was OK with the default Java icon but no way I can accept it as shown as a folder on Mac. … Read more
In this post, I’m going to show you how you can add custom claims from user attributes in Keycloak.
Overview This post provides you code snippets so you can start working with AWS S3/Digital Ocean Spaces via java SDK quickly. You can use AWS S3 SDK to access DigitalOcean Spaces. Create key pair to feed to the client Before working on the code, you need to create a key pair so you can access … Read more