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Flogger Fluent Logging 1. Overview In this tutorial, we’re going to talk about the Flogger framework, a fluent logging API for Java designed by Google. 2. Why use Flogger? With all the logging frameworks that are currently in the market, like Log4j and Logback, why do we need yet another… Continue Reading flogger-logging
Jetty ReactiveStreams HTTP Client 1. Overview In this tutorial, we’re going to learn how to use the Reactive HTTP client from Jetty. We’ll be demonstrating its usage with different Reactive libraries by creating small test cases. 2. What is Reactive HttpClient? Jetty’s HttpClient allows us to perform blocking HTTP requests.… Continue Reading jetty-reactivestreams-http-client
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Documenting a Spring REST API Using OpenAPI 3.0 1. Overview Documentation is an essential part of building REST APIs. In this tutorial, we’ll take a look at SpringDoc — a tool that simplifies the generation and maintenance of API docs, based on the OpenAPI 3 specification, for Spring Boot 1.x… Continue Reading spring-rest-openapi-documentation
Customizing the Result of JPA Queries with Aggregation Functions 1. Overview While Spring Data JPA can abstract the creation of queries to retrieve entities from the database in specific situations, we sometimes need to customize our queries, such as when we add aggregation functions. In this tutorial, we’ll focus on… Continue Reading jpa-queries-custom-result-with-aggregation-functions
Best Practices for REST API Error Handling 1. Introduction REST is a stateless architecture in which clients can access and manipulate resources on a server. Generally, REST services utilize HTTP to advertise a set of resources that they manage and provide an API that allows clients to obtain or alter… Continue Reading rest-api-error-handling-best-practices
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Debugging Java 8 Streams with IntelliJ 1. Introduction Since the introduction of Java 8, a lot of people started using the (new) stream functionality. Of course, there are moments when our stream operations don’t work as expected. IntelliJ has, besides its normal debugging options, a dedicated stream debugging function. In… Continue Reading intellij-debugging-java-streams
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Java Weekly, Issue 301 1. Spring and Java ===== >> How to deploy war files to Spring Boot Embedded Tomcat [vojtechruzicka.com] A couple of solutions — one for Spring Boot 2.x and one for 1.x. >> GraphQL server in Java: Part I: Basics [nurkiewicz.com] An interesting new series begins by… Continue Reading java-weekly-301
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Guide to Flash Attributes in a Spring Web Application 1. Overview Web applications are often dependent on user input to meet several of their use cases. As a result, form submission is a heavily used mechanism to gather and process data for such apps. In this tutorial, we’ll learn how… Continue Reading spring-web-flash-attributes
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Spring Validation Message Interpolation 1. Introduction Message interpolation is the process used for creating error messages for Java bean validation constraints. For example, we can see the messages by providing a null value for a field annotated with the javax.validation.constraints.NotNull annotation. In this tutorial, we’ll learn how to use the… Continue Reading spring-validation-message-interpolation
Simultaneous Spring WebClient Calls 1. Overview Typically when making HTTP requests in our applications, we execute these calls sequentially. However, there are occasions when we might want to perform these requests simultaneously. For example, we may want to do this when retrieving data from multiple sources or when we simply… Continue Reading spring-webclient-simultaneous-calls