In this tutorial, you will learn how to enable OpenAPI(Swagger) in your Spring Boot version 3 application. What is OpenAPI? OpenAPI (formerly known as Swagger) is a specification for building and documenting RESTful APIs. It allows developers to describe their API operations, inputs, outputs, and other aspects in a structured and machine-readable format. This documentation…
Read More Enable OpenAPI 3(Swagger) in Spring Boot 3If your project uses Spring Security and you have added Swagger/OpenAPI to it, there is a little additional configuration you need to do in order to make your /v3/api-docs and swagger-ui.html pages work. Enable Swagger URLs in Spring Security Project To enable Swagger URLs in a RESTful Web Services project built with Spring Boot and…
Read More Swagger/OpenAPI and Spring SecurityIn this tutorial you will learn how to enable and how to view Spring Cloud API Gateway Routes using Spring Boot Actuator. Developers use Actuator to enable API Gateway routes in order to keep track of the routes being used in their application. By exposing these routes through Actuator endpoints, developers can get valuable information…
Read More Viewing Spring Cloud API Gateway Routes with Spring Boot ActuatorIn 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 Gateway