Documenting API is an essential part of the real-world project where we have multiple teams from microservices to the frontend side all transfer data through REST API. So well and clear API documentation will save us a lot of time in the development process. In 2017, Open API Initiative released OpenAPI Specification 3.0.0 which includes…
Read More Document Spring REST API with OpenAPI 3(Swagger)In this tutorial, you will learn how to implement the API Gateway Lambda Authorizer in Java. You will also learn how to make Lambda Authorizer validate Authorization JWT. First, we will create an API using API Gateway then we will make lambda function as an integration point for the GET method of our resource. After…
Read More API Gateway Lambda Authorizer Example in JavaIn the previous blog post, we covered the basics of how to use Keycloak with Spring boot. In this blog post, we will explore Role-based Access Control to Rest API with Keycloak. So let’s get started! Imagine we have a microservice for a Research Journal Management System that can serve users with two types of…
Read More Role-Based Access Control to REST API with KeycloakIn this tutorial, we are going to see how we can use the AWS API Gateway as a trigger to an AWS Lambda function. This tutorial requires you to be familiar with building and deploying Serverless Applications with AWS Lambda. Prerequisite: Build and Deploy a Serverless Spring Boot Web Application with AWS Lambda Firstly, add…
Read More Trigger a Lambda Function Using AWS API GatewayThis tutorial is the fifth in a series on Reactive Programming in Java and Spring Framework. In this tutorial, we will develop a simple REST API using Spring Web flux. To completely understand this tutorial, it is better to read a previous tutorial first. It would also help to know how to develop a REST Controller using…
Read More Developing a REST API using Spring WebFluxclass Test { public static void main(String[] args) { System.out.println(“Normal Stream…”); IntStream integers = IntStream.rangeClosed(1, 10); integers.forEach(num -> System.out.print(num + ” “)); System.out.println(); System.out.println(“Parallel Stream…”); IntStream integers2 = IntStream.rangeClosed(1, 10); integers2.parallel().forEach(num -> System.out.print(num + ” “)); } } Output: Normal Stream… 1 2 3 4 5 6 7 8 9 10 Parallel Stream… 7 6…
Read More Introduction to Parallel Streams API in Java1. Overview of Stream API Java Stream API is a powerful tool for processing collections of data. It was introduced in Java 8 and allows developers to perform operations on data in a functional way. Java Stream API is used for filtering, transforming, and aggregating data in a concise and expressive manner. This can help…
Read More Java Stream API TutorialThis tutorial will teach you how to create a simple Spring Cloud API Gateway Global Pre-filter and Post-filter classes. Global filters are executed for every route defined in the API Gateway. The main difference between the pre-filter and post-filter classes is that the pre-filter code is executed before Spring Cloud API Gateway routes the request to a…
Read More Spring Cloud API Gateway Global Filter ExampleOne way to ensure that an HTTP request to a web service endpoint contains an Authorization JWT token is to configure a gateway route to require an Authorization header. If the HTTP request does not contain an Authorization header, Spring Cloud API Gateway will not even route this request to a destination microservice. We can…
Read More The Header Predicate in Spring Cloud API GatewayThis tutorial will teach you how to configure your Spring Cloud API Gateway to automatically create routes based on services registered with discovery clients like Eureka, Consul, or Zookeeper. For a step-by-step series of video lessons, please check this page: Spring Boot Microservices and Spring Cloud. Enable Discovery Locator A quick way to enable Spring Cloud…
Read More Spring Cloud API Gateway Automatic Mapping of RoutesIn this tutorial, you will learn how to use the Keycloak REST API to create a new user for your application. There are a few ways you get to register a new user: You can create a new user using the Keycloak Web Administration Console, You can let users register a new account themselves, Or…
Read More Keycloak REST API: Create a New UserIf a requested Microservice takes long time to respond, Zuul Api Gateway might timeout and a Gateway timeout error will take place. { “timestamp”: “2019-05-24T00:53:22.152+0000”, “status”: 504, “error”: “Gateway Timeout”, “message”: “com.netflix.zuul.exception.ZuulException: Hystrix Readed time out” } In this short blog post I am going to share with you how to make your Zuul Api…
Read More Zuul API Gateway Timeout ErrorIn this tutorial, I am going to share with you how to allow access to your Microservice from an IP address of Zuul API Gateway only. For a step by step series of video lessons, please check this page: Spring Boot Microservices and Spring Cloud. In my previous tutorial, I have shared with you how…
Read More Allow Only IP Address of Zuul API GatewayIn this tutorial, you will learn how to create and run your own Zuul API Gateway and how to register with it more than one Spring Boot Microservice. To be able to follow this tutorial you need to know how to create simple RESTful Web Services with Spring Boot. If you need to review that,…
Read More Zuul API Gateway TutorialIn this tutorial, you will learn how to start up your own Spring Cloud API Gateway and how to make it route HTTP Requests sent to a registered with Eureka Discovery Server Microservice. I will also show you how to register more than one Spring Boot Microservice with Eureka and how to configure your Spring…
Read More Spring Cloud API Gateway Tutorial