In this article, we will be creating a ReactJS app to view your crypto balance and transfer tokens from your account to another account. Introduction In my previous article, We created a new ERC-20 based Ethereum crypto token called “Nice token” and this article is a follow-up to it to create…

In this article, we will be creating an Ethereum based cryptocurrency token using a smart contract and deploy it to a blockchain network. Introduction I was a little curious about the raise of Web3 and wanted to know more about it. With the growing chatter about NFTs, Web3 made me curious…

In this article, we will be looking into how we can communicate with Kafka Cluster using Spring Cloud Stream. Introduction Spring Cloud Stream, is a mechanism by which you can decouple the implementation of your producers and consumers from the type of messaging infrastructure you want to use. This allows us…

In this article, we will be looking into how we can publish and subscribe to a Kafka topic. Introduction Kafka over the years has gained a lot in popularity for its high throughput and real-time asynchronous messaging. It's considered a de facto standard for streaming of events and provides fault-tolerant storage…

In this article, we will be looking into how we can integrate a circuit breaker and a retry mechanism, to handle failures while making synchronous calls to another service. Introduction With the growing number of services, services might need to communicate with other servers synchronously and hence become dependent on the…

In this article, we will look into some Spring Cache concepts and then integrate Ehcache 3. Introduction In an application, we can reduce the amount of processing or network calls to another service by introducing caching. Caching allows us to improve our application performance by avoiding executing either computationally heavy tasks…

In this article, we would be looking at how we can externalize configs using Spring Cloud Config. Introduction One of the principles from the 12 Factor App, states that we have to separate our application configuration from the code. The configuration varies based on the environment and it's better to organize…

In this article, we will explore how to implement distributed tracing using Jaeger and visualize the traces using Jaeger UI. Introduction Jaeger is an open-source distributed tracing mechanism that helps to trace requests in distributed systems. It is based on opentracing specification and is a part of the Cloud Native Computing…

In this article, we will be exploring how we can integrate a resource server with an API gateway that is integrated with Keycloak and enable role-based access control (RBAC). Introduction In my previous article “Spring Cloud Gateway Keycloak OAuth2 OIDC Integration”, I have shown how we can integrate Keycloak with Spring…