spring

Unit test for Spring's WebClient

WebClient to quote its Java documentation is Spring Framework's Non-blocking, reactive client to perform HTTP requests, exposing a fluent, reactive API over underlying HTTP client libraries such as Reactor Netty.In my current project I have been using WebClient extensively in making service to service calls and have found it to be an awesome API and I love its use of fluent interface. Consider a remote service which returns a list of "Cities". A code using WebClient looks like this:...import org.springframework.http.MediaTypeimport...

Difference between vs

1. Overview In this tutorial, we're going to learn about the differences between two major XML configuration elements of Spring: <context:annotation-config> and <context:component-scan>. 2....

How to Compress Requests Using the Spring RestTemplate

1. Introduction In this short tutorial, we'll look at how to send HTTP requests containing compressed data. In addition, we'll look at how to configure a Spring web application so it handles...

Spring Cloud: Contract

Overview In this article, we'll introduce you to Spring Cloud Contract, which is Spring's response to Consumer-Driven Contracts. Nowadays, applications are thoroughly tested - whether it be unit...

Spocklight: Use Stub or Mock For Spring Component Using @SpringBean

When we write tests or specifications using Spock for our Spring Boot application, we might want to replace some Spring components with a stub or mock version. With the stub or mock version we can write expected outcomes and behaviour in our specifications. Since Spock 1.2 and the Spock Spring extension we can use the @SpringBean annotation to replace a Spring component with a stub or mock version. (This is quite similar as the @MockBean for Mockito mocks that is supported by Spring Boot). We only have to declare a variable in our...

Logging Spring WebClient Calls

1. Overview In this tutorial, we are going to show how to customize Spring's WebClient – a reactive HTTP client – to log requests and responses. 2. WebClient WebClient is a reactive and...

How to Use Schema Registry and Avro in Spring Boot Applications

TL;DR Following on from How to Work with Apache Kafka in Your Spring Boot Application, which shows how to get started with Spring Boot and Apache Kafka®, here I will demonstrate how to enable usage...

Using Project Lombok with Gradle

Introduction In this post, we are going to write about Project Lombok, a must-have tool for every Spring programmer. Lombok is a Java library, that enhances programmer productivity, by providing...

Spring State Machine là gì

1. State machine là gì? State Machine là một mô hình tính toán dựa trên một máy giả định được tạo thành từ một hoặc nhiều trạng thái. Nó chuyển từ trạng...

Spring Bean Lifecycle

The Spring IoC (Inversion of Control) container manages Spring beans. A “Spring bean” is just a Spring managed instantiation of a Java class. The Spring IoC container is responsible for...

Stripe Integration with Java Spring for Payment Processing

Introduction It's no lie that "everything is going digital". A lot of products never reach the shelves, but rather get sold online. With the arising number of entrepreneurs, startups, and...

MyBatis with Spring

1. Introduction MyBatis is one of the most commonly used open-source frameworks for implementing SQL databases access in Java applications. In this quick tutorial, we’ll present how to integrate...

Spring Profiles

Enterprise Spring applications typically need to run in multiple environments. For example, development, testing, staging, and production. Each such environment has its own set of settings. For...

Spring Cloud: Distributed Tracing with Sleuth

Overview In this article, we'll introduce you to Spring Cloud Sleuth, which is a distributed tracing framework for a microservice architecture in the Spring ecosystem. In a typical microservice...

Spring JdbcTemplate Handle Large ResultSet

Spring JdbcTemplate example to get a large ResultSet and process it. P.S Tested with Java 8 and Spring JDBC 5.1.4.RELEASE 1. Get large ResultSet 1.1 Below is a classic findAll to get all data from a table. BookRepository.java public List<Book> findAll() { return jdbcTemplate.query( "select * from books", (rs, rowNum) -> new Book( rs.getLong("id"), rs.getString("name"), ...

Chicken and egg - resolving Spring properties ahead of a test

Consider a service class responsible for making a remote call and retrieving a detail:...public class CitiesService { private final WebClient.Builder webClientBuilder; private final String baseUrl; public CitiesService( WebClient.Builder webClientBuilder, @Value("${cityservice.url}") String baseUrl) { this.webClientBuilder = webClientBuilder; this.baseUrl = baseUrl; } public Flux<City> getCities() { return this.webClientBuilder.build() .get()....This is a...

Spring Annotations: Testing

Introduction The Spring Framework is a very robust framework, released in 2002. Its core features can be applied to plain Java applications or extended to complex, modern web applications. As it's constantly being updated and is following new architectural and programming paradigms, it offers support for many other frameworks that work hand-in-hand with it. With such a vast array of functionalities, it's only normal that it introduces us to some new annotations, which are a key part of developing Spring applications. Spring's configuration is...

Reloading Properties Files in Spring

1. Overview In this tutorial, we’re going to show how to reload properties in a Spring application. 2. Reading Properties in Spring We have different options to access properties in...

R2DBC – Reactive Relational Database Connectivity

1. Overview In this tutorial, we’ll show how we can use R2DBC to perform database operations in a reactive way. In order to explore R2DBC, we’ll create a simple Spring WebFlux REST application...

Spring Request Parameters with Thymeleaf

1. Introduction In our article Introduction to Using Thymeleaf in Spring, we saw how to bind user input to objects. We used th:object and th:field in the Thymeleaf template and @ModelAttribute in the...

Using Spring Boot Application as a Dependency

1. Overview In this tutorial, we’ll see how to use a Spring Boot application as a dependency of another project. 2. Spring Boot Packaging The Spring Boot Maven and Gradle plugins both package our...

Embedded Redis Server with Spring Boot Test

1. Overview Spring Data Redis provides an easy way to integrate with Redis instances. However, in some cases, it’s more convenient to use an embedded server than to create an environment with a...

Spring Annotations: Spring Cloud

Introduction The Spring Framework is a very robust framework, released in 2002. Its core features can be applied to plain Java applications or extended to complex, modern web applications. As it's constantly being updated and is following new architectural and programming paradigms, it offers support for many other frameworks that work hand-in-hand with it. With such a vast array of functionalities, it's only normal that it introduces us to some new annotations, which are a key part of developing Spring applications. Spring's configuration is...

Fault Tolerance in Distributed Systems: Tracing with Apache Kafka and Jaeger

Using Jaeger tracing, I’ve been able to answer an important question that nearly every Apache Kafka® project that I’ve worked on posed: how is data flowing through my distributed system? Quick...

Spring WebClient vs. RestTemplate

1. Introduction In this tutorial, we’re going to compare two of Spring’s web client implementations – RestTemplate and new Spring 5’s reactive alternative WebClient. 2. Blocking vs....

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