ServletContext is an object instantiated by Web Container when we deploy a Jakarta EE web application. It is used to store and retrieve information that we configure for all the Servlets present in the application. And ServletConfig helps us get information defined for a particular… Read More
I introduced Refresh Token grant type in OAuth 2.0 in the tutorial about Grant types in OAuth 2.0. In this tutorial, I will show you how we get a new access token using refresh token with Keycloak! First, I will create a new client in… Read More
In the previous tutorial, I showed you how to add a new client in Keycloak and also showed you how to configure a client that supports grant type Authorization Code with PKCE of OAuth2. In this tutorial, I will show you how to add and… Read More
ServletContextEvent and ServletContextListener are two objects of Jakarta EE Servlet that are responsible for recording and handling changes in the ServletContext of a web application when this web application is deployed to the Server Runtime. Any changes to the ServletContext, the ServletContextEvent will log and… Read More
In the previous tutorial, I showed you how to install Apache Kafka on macOS. Installing Apache Kafka using Docker Compose will help us quickly start up an Apache Kafka server without much effort, just install Docker and a docker-compose.yml file. How is it in detail?… Read More
I introduced you to OAuth 2.0 and OAuth 2.0 is just a framework related to Authorization, that is, it only defines what resources a Client Application can use, in the access token, so that when requesting to the Resource Server, Resource Server will base on… Read More
In this tutorial, I will show you how to install Apache Kafka on macOS! First, go to Apache Kafka’s Download page at https://kafka.apache.org/downloads to download its latest version! After the download is complete, please unzip this download file: Apache Kafka depends on Apache ZooKeeper for cluster… Read More
I introduced you to Flyway to implement database migration. For Spring Boot applications that want to use Flyway, this integration is easy because Spring Boot already supports it. How is it in detail? Let’s find out together in this tutorial! First, I will create a… Read More
In the previous tutorial, I showed you how to implement an Authorization Server using Spring Authorization Server, but the information about RegisteredClient in this tutorial is stored in memory. To store RegisteredClient information in the database, how will we do it? In this tutorial, I… Read More
Jackson library makes it possible for us to convert data in JSON form to different data formats and vice versa. In this tutorial, I will show you how to convert data from JSON to CSV! First, I will create a new Maven project: with Jackson… Read More
