In this tutorial, you will learn how to use @AuthenticationPrincipal annotation to get the Jwt object containing the details of a provided in HTTP Request access token. When we send a request containing an access token in the Authorization header, behind the scenes, Spring Framework will do a lot of work and if all is good,…
Read More @AuthenticationPrincipal – Getting the Jwt ClaimsIn this tutorial, you will learn how to implement a very simple OAuth2 Resource Server that will validate the JWT token it has earlier acquired from a Keycloak authorization server. I this tutorial I will not show how to acquire the JWT access token but if you are interested to learn how to do it,…
Read More OAuth 2 Resource Server and KeycloakIn 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 GatewayIf you are working on a REST API for your project and you need to document it so that you can share API documentation with other team members or external to your team developers, there are at least a couple of ways to do it: You can either open a new Google Document and start…
Read More How To Document REST APIThis tutorial will teach you how to create a JPA Native SQL Query to only select information from specific columns. You can find many more Spring Data JPA-related tutorials on this site. Some of the most popular tutorials are: One-to-One Mapping Hibernate/JPA Using Spring Boot and MySQL One-to-Many Mapping Hibernate/JPA Using Spring Boot and MySQL…
Read More Select Specific Columns with JPA Native QueryIn this blog post, I am going to list commonly used POM.XML dependencies for building RESTful Web services with Spring Boot and Spring MVC. The list of below dependencies is not complete and will depend on the functionality you need your RESTful Web Services to support. But if you are building a simple REST API…
Read More Common POM.XML Dependencies for RESTful Web ServicesIn this short tutorial, I am going to share with you how to enable CrossOrigin in a RESTful Web Service API built with Spring Boot that also has Spring Security enabled. Enable CrossOrigin for Specific Endpoint To enable cross-origin AJAX HTTP requests to a specific RESTful Web Service endpoint in our Rest Controller class we can use…
Read More CrossOrigin and CORS in RESTful Web ServiceIn this tutorial, you will learn how to retrieve the HTTP header value from an HTTP response while testing your RESTful API using REST Assured. What are HTTP Headers? HTTP headers are a fundamental part of the HTTP protocol, which is the protocol used to transfer data over the web. An HTTP header is a…
Read More Read HTTP Header with REST AssuredIn this short tutorial on REST Assured you will learn how to get the entire HTTP Response Body when testing your RESTful Web Service Endpoint. Web Service Endpoint Response Let’s assume we have the following Web Service Endpoint URL and when HTTP GET request is made to this Web Service Endpoint a JSON representation of…
Read More REST Assured Get HTTP Response BodyIn this tutorial, you will learn how to use TestRestTemplate to get a list of objects. If you are also interested to learn how to send an HTTP POST request, then please have a look at the “TestRestTemplate HTTP Post Example” tutorial. Maven Dependency To use TestRestTemplate in your Spring Boot project, you should have the…
Read More Get List of Objects with TestRestTemplateYou will use @MockBean annotation to create and automatically add mocks to Spring ApplicationContext. In this tutorial, we will look at different ways you can use @MockBean annotation to create mocks. If you are testing your application with JUnit and Mockito, then there are many other useful tutorials you will find in the JUnit category of…
Read More @MockBean Annotation ExampleIn 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 this tutorial, we are going to learn that how we can use AWS Lambda to store user data in Amazon RDS. This tutorial is divided into three parts. Creating database using Amazon RDS. Creating Spring Boot Application. Testing Lambda function. We can refer to the following tutorials before going ahead. Build and deploy a…
Read More Using AWS lambda to store user data in Amazon RDSIn 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 Gateway