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Grails 3.3 Integration Testing with Spock Mocks

It is easy to use the Spock Framework, shipped with Grails, to mock or stub a collaborator (such as a service) in our Grails unit tests. The Testing chapter explains a bit about mocking collaborators, doWithSpring/doWithConfig callback methods, the FreshRuntime annotation to mock beans in tests — but they’re mainly for unit testing. How about mocking beans in an integration ...

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Project Package Organization

The package is a fundamental concept in Java and one of the first things you stumble upon when starting programming in the language. As a beginner you probably don’t pay much attention to the structure of packages, but as you become a more experienced and mature software developer, you start to think what can be done to improve their efficiency. ...

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Is it possible to have an abstract method in a final class?

This is one of the interesting core Java questions which was asked to one of my readers recently during a telephonic interview for Java developer job interview. Even though he knows that you cannot make an abstract class final in Java, he got confused by the wording of the methods. The answer is simple, No, it’s not possible to have an ...

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Develop and Deploy Microservices with JHipster

Check out the Okta user management API and never build auth again! Get started in minutes with a free developer account. Register Today! JHipster is one of those open-source projects you stumble upon and immediately think, “Of course!” It combines three very successful frameworks in web development: Bootstrap, Angular, and Spring Boot. Bootstrap was one of the first dominant web-component ...

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Outputting the given, when, then, Extending Spock

Spock is a Java testing framework, created in 2008 by Peter Niederwieser a software engineer with GradleWare, which facilitates amongst other things BDD.  Leveraging this example, a story may be defined as: Story: Returns go to stock As a store owner In order to keep track of stock I want to add items back to stock when they're returned. Scenario ...

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Basic API Rate-Limiting


It is likely that you are developing some form of (web/RESTful) API, and in case it is publicly-facing (or even when it’s internal), you normally want to rate-limit it somehow. That is, to limit the number of requests performed over a period of time, in order to save resources and protect from abuse. This can probably be achieved on web-server/load ...

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Cloud Foundry Application manifest using Kotlin DSL

I had a blast working with and getting my head around the excellent support for creating DSL’s in Kotlin Language. This feature is now being used for creating gradle build files, for defining routes in Spring Webflux, for creating html templates using kotlinx.html library. Here I am going to demonstrate creating a kotlin based DSL to represent a Cloud Foundry Application Manifest content. A sample ...

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Java Bean Validation Basics

This post summarizes some quick and easy examples for the most common things you would want to do with the Java Beans Validation API (JSR 349, JSR 303). Remember, Beans Validation is independent of Java EE. Although it is built in as part of a Java EE compliant server, the API can also be used just as easily in a ...

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