A Study Case: Building A Simple Credit Card Fraud Detection System – Part 2: Mapping Gerkhin to Kafka Streams

Part 2 will talk about mapping the Gerkhin feature file into Cucumber Step Definition and its implementation using Kafka Streams.

How to Unit Test Kafka Streams Application – PART 1 (DSL)

This is part 1 of 2 articles to unit test Kafka Streams application. The first part talks about testing DSL transformation, stateless and stateful, including joining and windowing.

How to Isolate Database Credentials in Spring Boot Using Vault

Data privacy and security became critical nowadays. Thus, we need to isolate database credentials and make it transparent to our applications/services.

How to Secure REST Endpoint Using Spring Boot and OAuth2

Overview In this article, I will provide a simple example to secure REST example by using Oauth2. I will not explain what Oauth2 protocol is all about in detail. In short, to implement this authorization […]

How to Register Spring Cloud with Consul Service Discovery

One of the main component of micro service architecture is service discovery (SD). So far in this blog I mentioned two tools for service discovery, which are Eureka and Consul. But if you may notice, whenever I used spring-cloud framework, I always choose Eureka. On the other hand, I pick consul when I talked about Golang.

How to Setup Micrometer with Prometheus in Spring Boot 1.5

Overview In this article, I will revisit a little bit my old article, but still valid, regarding monitoring your services. As you can see in my previous article, I wrote about monitoring service in Go […]

How to Configure HikariCP in Spring Boot Application

Overview In Java world, when it comes to database connectivity, there are two main approaches to deal with. First one is direct JDBC connection by using DriverManager. The other one is by using data source. […]

How to Import Signed Certificate into Java Keystore

Overview In this short blog post, I will explain how to import certificate into Java Keystore. This steps is useful whenever you need to access HTTPS from JVM. Export the certificate from your browser as […]

Basic Usage of Functional Interface in Java 8

interface

Introduction After couples of Golang articles, I want to bring something different in this article. I want to talk about Java 8 features, which is functional interfaces. This feature comes up in 8th edition due […]

Document Your REST API using Spring Boot and Swagger

Overview As a developer, you considerably have two main tasks while developing the system. One part is coding itself. Of course, when I say coding, it means code and testing (I would say a TDD […]