Tons of possibilities are waiting for computer science students. With a good grip on whichever path they are willing to take on after college, they will be more than ready to shape their own future careers in Tech! In this day and age, you have to hold on to your…

Learn how to use AWS AppMesh to facilitate inter-microservice communication with OpenFeign without using Spring Eureka. Instead, Service Discovery native to AWS will be used. 1. Introduction Microservice architecture is becoming more and more popular nowadays. Thanks to the ever-changing requirements of software development. It allows cross-functional teams to develop, test, and…

To create a pooled RestTemplate we need to use HttpComponentsClientHttpRequestFactory which uses CloseableHttpClient from httpclient library (at least version 4.3 to support timeout. 1. Dependencies <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> </dependency> 2. Create HttpComponentsClientHttpRequestFactory private HttpComponentsClientHttpRequestFactory newHttpComponentsClientHttpRequestFactory() { final PoolingHttpClientConnectionManager poolingHttpClientConnectionManager = new PoolingHttpClientConnectionManager(); poolingHttpClientConnectionManager.setDefaultMaxPerRoute(100); poolingHttpClientConnectionManager.setMaxTotal(100); final RequestConfig requestConfig = RequestConfig.custom() .setConnectionRequestTimeout(100) .setConnectTimeout(100) .setSocketTimeout(100) .build()…

Are you looking to implement authentication forms in your NextJS project using Amazon Cognito? Then this article is for you. 1. Introduction 1.1 Amazon Cognito Amazon Cognito is an authentication and authorization service that lets you manage the access control to your applications, whether it’s a web or mobile app. Whether you are dealing with…

Learn how to secure Spring REST endpoints using Aspect and without using Spring Security. 1. Introduction In this project we introduce a security interceptor that pre-handles a REST request and where a bearer token is converted into an application user. If the user does not exist or does not have the required…

Learn how to build a NextJS application that uses `redux-observable` to manage side effects. 1. Introduction In this project, we will learn how to build a basic CRUD application using NextJS Typescript and Redux-Toolkit to manage the side effects. 2. Tech Stack NextJS — React framework Typescript Redux-Toolkit — toolset for redux state management MUI5…

Learn how to build a NextJS application that uses `redux-observable` to manage side effects. 1. Introduction In this project, we will learn how to build a basic CRUD application using NextJS and Redux & Observable to manage the side effects. Note: we are not using `AjaxObservable` from the `rxjs` library; as of…

1.) Introduction This blog is an extension of https://czetsuya-tech.blogspot.com/2020/05/jdbc-tutorial-connecting-to-mysql-running-on-docker.html where we discuss how to connect to a MySQL instance using JDBC. In this article, we will demonstrate how we can run a MySQL instance on docker and connect a standalone Java application on it using JPA. While this exercise is done using…

I. Introduction In this blog, we will create a docker-compose file that will run a Keycloak and MySQL instance as a docker container. Keycloak will connect to the MySQL database using JDBC. II. Prerequisites Docker must be running on your local machine. III. What should be inside the project? The docker compose file keycloak/import-realm.json — This realm will imported into Keycloak…