Spring Cloud

by 0 comments on "How to use Project Lombok in Spring Boot"

In this tutorial, you will learn how to use the Spring Boot application with project Lombok. Overview No doubt Java is a wonderful language but one of the drawbacks of Java is its verbose nature. This makes it fairly complicated for everyday tasks such as composing a simple POJO object. For example, Constructing of methods…

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by 0 comments on "Create AWS Lambda Functions from Spring Cloud Functions"

This tutorial is about creating Lambda functions from Spring Cloud Functions. Spring Cloud Functions provide a way to implement the business logic via functions and decouple code development from the runtime target. Hence, the developer can focus solely on the implementation of logic. The developer need not worry about the target endpoint type, connectivity, integration,…

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by 0 comments on "Enforcing Resilience in a Spring Boot App using Resilience4J"

An important property of modern web apps is Resilience. In simple words, resilience is the ability of a system’s feature to fail gracefully without impacting the entire system. In the case of web apps, we want to make sure that the entire system will not be down if a remote service (a database, API Server)…

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by 0 comments on "Spring Cloud Config Server and Config Client"

In this tutorial on Spring Cloud you will learn how to create your own Spring Cloud Config Server and also, how to configure a Spring Boot Application to be a Spring Cloud Config Client. Spring Cloud Config Server Spring Cloud Config Server is a Spring Boot application. So to create our own Spring Cloud Config…

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by 0 comments on "Spring Cloud API Gateway Global Filter Example"

In this tutorial, you will learn how to create a very 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 pre-filter and post-filter class is that the pre-filter code is executed before Spring Cloud API Gateway routes the request…

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by 0 comments on "The Header Predicate in Spring Cloud API Gateway"

One of the ways to make sure 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.  This way, if the HTTP request does not contain an Authorization header, Spring Cloud API Gateway will not even route this request to…

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by 0 comments on "Spring Cloud API Gateway Automatic Mapping of Routes"

In this tutorial, you will learn 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 very quick way…

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by 0 comments on "Start Spring Boot App on a Random Port Number"

In this tutorial, you will learn how to start your Spring Boot application on a random port number. This is very helpful when you need to start multiple instances of the same Spring Boot application and then balance HTTP requests between the running instances. If you are interested to learn how to balance HTTP requests…

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by 0 comments on "@LoadBalanced RestTemplate Call Internal Microservice"

In this tutorial, you will learn how to create an instance of @LoadBalanced RestTemplate and make it communicate with an internal microservice. For a step by step series of video lessons, please check this page: Spring Boot Microservices and Spring Cloud. Create RestTemplate Bean To create an instance of RestTemplate, you will need to first…

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by 0 comments on "Pass Authorization Header to Downstream Microservice"

In this tutorial, you will learn how to make Zuul API Gateway pass an Authorization header to a downstream Microservice. To learn how to make Spring Boot Microservice read HTTP Request headers, please read this tutorial: Read HTTP Request Header in Spring MVC. Configure Zuul API Gateway to Forward an Authorization Header By default, Zuul…

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by 0 comments on "Docker Image for Spring Cloud Config Server"

In this short tutorial, you will learn to create a Docker image for your Spring Cloud Config Server which uses Symmetric or Asymmetric encryption to protect sensitive information. To learn how to create Spring Cloud Config that uses Symmetric encryption, read Spring Cloud Config – Symmetric Encryption and Decryption(Includes Video tutorial). And to learn how to create…

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by 1 comment on "Secure Eureka Dashboard with Spring Security"

In this tutorial, I am going to share with you how to secure Spring Cloud Eureka dashboard with Spring Security. To learn how to build RESTful Microservices with Spring Cloud by watching step-by-step video lessons, please check this page: Spring Boot Microservices and Spring Cloud. Add Spring Security to Eureka To secure Eureka with Spring Security…

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by 0 comments on "Zuul API Gateway Timeout Error"

If 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…

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