Deploy Spring Boot Applications With More Confidence and Less Regressions

Master testing real-world Spring Boot applications with this comprehensive hands-on course

NEWS: Receive two free testing-related resources when enrolling for the Masterclass (eBook & online course).

TL;DR: The Testing Spring Boot Applications Masterclass is a deep-dive course on testing your Spring Boot applications. You'll learn how to effectively write unit, integration, and end-to-end tests while utilizing Spring Boot's excellent test support.

That sounds interesting!

Knowing How to Effectively Test Separates the Serious Engineer from a Hobby Developer

“Quality is not an act. It is a habit.” – Aristotle

Do you remember writing your first Spring Boot application? You were excited that you now finally expose data via an API and can connect to a database.

Testing your application was the last thing you could think of at this moment.

Once you start using Spring Boot in a professional environment there is no way around testing. Testing your application gives you confidence, fearless deployments on Friday afternoons and a good night of sleep.

Most tutorials and courses about testing barely go beyond the Hello World example of testing a calculator.

This does not prepare you for the real world where your application faces database access, external systems, messaging system, network, etc.

There are so many great libraries and techniques out there for the Java ecosystem when it comes to testing. Mastering them all, right after you understand the basics about Spring Boot, is hard.

Testing can be joy, if you are familiar with all the great tools you have access to: JUnit, Mockito, AssertJ, Hamcrest, JsonPath, JSONAssert, Testcontainers, Selenium, LocalStack, Awaitility, and not to forget the whole Spring Testing support.

Especially with Spring Boot you get so much functionality when it comes to testing. What you need are recipes to tackle testing different parts of your applications and then apply them.

This Testing Spring Boot applications Masterclass is all about making you an expert when it comes to testing Spring Boot applications in an efficient way.

All You Need to Know About Testing
Spring Boot Applications

The number of testing libraries is huge in the Java ecosystem. One might get overwhelmed with all the different solutions. 

This online Masterclass guides you through every testing library you need to verify your Spring Boot application is working as expected.

After working with this course, you not only have recipes at hand to test different parts of your application, but you are also familiar with industry best practice.

Get First-Hand Insights Into the Masterclass

Subscribe to the newsletter and I'll send you four Masterclass preview lessons from different modules to your inbox

Enroll now and never worry about testing your Spring Boot Application again! NEW: Up-to-date with Spring Boot 2.5.0

Your Journey to More Confident Releases

Testing Spring Boot Applications Course Map

Here’s What You’ll Learn In Detail

Whether you just started with Spring Boot or are already using it in several projects, this Spring Boot Testing Masterclass guides you through all relevant parts of testing Spring Boot applications.

Understand What and How to Test

You are unsure which parts of your application to test? There is a good chance that you are not focusing on the relevant parts of your application you should test.

Go Beyond Trivial Unit Testing

After working with this course you'll have recipes at hand to test all non-trivial parts of your application like database access, HTTP communication, using cloud services (e.g. SQS from AWS), etc.

Master Different Testing Libraries

Not only will you be able to use all presented testing libraries for your application, but also understand what they are about and when to use which. Knowing when to use which library is a key skill.

Testing Best Practices

This Masterclass includes an own section about industry best practices for testing applications. Make use of knowledge from years of writing tests for enterprise applications.

Here’s What the First Early-Bird Students Say About This Course

Vlad Flore Course Student

Vlad Flore

Softtware Engineer - Homepage

Testimonial on Twitter

Bought it a couple of days ago and had a look at it -> it's awesome! Really like the tech stack and the project looks altogether very professional! Lots of good stuff in there!

Joined with the Early-Bird Batch #1

Wim Deblauwe Course Student

Wim Deblauwe

Software Engineer - Homepage

Testimonial via Mail

Philip has made a fantastic overview of the full testing landscape of Spring. The videos are clear and explain details and common pitfalls in great depth. Looking forward to the rest of the course.

PS: Wim is also book author of Taming Thymeleaf and Practical Guide to Building an API Back End with Spring Boot

Joined with the Early-Bird Batch #2

Siva Course Student


Software Engineer and Blogger

Detailed review of the Masterclass on his blog

I got an opportunity to review the course I find it wonderful for learning how to test Spring Boot applications leveraging modern testing frameworks and libraries....

I would highly recommend Masterclass for anybody working with Spring Boot applications.

Read the full review here.

Joined with the Early-Bird Batch #7

Course Curriculum

Overview of the different Masterclass Modules


Module 1: Introduction 

We'll start with an application walk-through, to get you familiar with the code base we test throughout the Masterclass.

At the end of this module you'll be able to start the Book Reviewr application and its infrastructure components on your machine.


Module 2: Testing With the Spring Boot Starter Test

Getting familiar with the swiss-army knife that every Spring Boot project includes: Spring Boot Starter Test.

We'll cover all testing libraries that come with this starter and take a detailed look into testing with JUnit 5 and mocking with Mockito.


Module 3: Testing Database Access

Start writing efficient tests for your database layer while utilizing Spring Boot test features like @DataJpaTest, TestEntityManager, @Sql, etc.

Furthermore, with this module you'll start using Testcontainers to replace the default in-memory database, learn how you can pre-populate your database, and understand the pitfalls when writing tests where the EntityManger is involved.


Module 4: Testing the Web Layer

MockMvc to the rescue!

Learn how to effectively test your web-layer (@RestController and @Controller) in isolation. You have your endpoints secured with Spring Security? No problem! There is great support available to ensure only authenticated users with the correct privileges reach your endpoints.


Module 5: Testing Further Slices of our Application

Ever wanted to know how to test your WebClient or RestTemplate HTTP calls? How to ensure your business logic is working as expected and how to verify your messaging controllers?

In this module, we'll tackle further slices to effectively test different parts of our application in isolation. In addition, we'll write our own test slice.


Module 6: Writing Tests With the Whole Spring Context

It's time to write integration tests using @SpringBootTest!

With the knowledge of previous modules, we can mock almost any external infrastructure component, except Keycloak. We'll introduce WireMock to mock the HTTP interaction with the identity provider or any other system during application startup (e.g. Salesforce, Stripe, SAP, etc.).


Module 7: Writing Web Tests

Writing end-to-end tests to ensure users can interact with your application.

Having automated web-tests for your happy-paths can literally save your ass. We'll make the most of Selenium and Selenide by verifying the Book Reviwr application without any manual WebDriver setup (including VNC recording, screenshots on failure, etc.).


Module 8: Testing Best Practices

Build tool configuration, test strategies, naming strategies, testing static methods, working with time, test report visualization within your CI (e.g. Jenkins, GitLab CI, Azure DevOps) server, etc.

... and last but not least: Drastically reduce your build times with Spring's Context Caching mechanism.

Talk Is Cheap, Show Me Some Real Lessons!

Follow him on:

Your The Course Instructor:

Philip (rieckpil)

Philip is an independent IT-Consultant living in Berlin. He started working with Java back in 2015 and has used it together with Spring Boot for multiple applications in several industries. Testing is an integral part of his daily work as he is a profound craftsman.

Once Philip understood the ins and outs of the Java testing landscape, writing tests makes as much fun as writing production code for him. He's also a won around TDD (Test Driven Development) practitioner and regularly shares testing techniques among his colleagues and clients.

He started teaching Java topics on YouTube in 2018 and is writing content about the Java ecosystem on his blog since 2017.

More than 1.000 course students have enrolled for his online courses. Besides that, he's also actively helping developers on Stack Overflow with their questions around testing Java applications.

Here’s what people are saying about the course instructor

Tom Hombergs

Tom Hombergs

Founder of

Philip is a dedicated developer and doesn't give up until he has understood the details of a topic.

In his courses and articles, he transfers this knowledge to you and they leave you smarter than before. 

Looking forward to working with you in the future, Philip

Vlad Mihalcea

Vlad Mihalcea

Founder of

Philip is a very skilled content creator who managed to publish high quality articles and videos that cover a wide range of topics, like Spring, Java EE, or Jakarta EE.

He pays a lot of attention to details, so if you enjoyed his articles and videos, you are surely going to love his video courses.

Marco Behler

Marco Behler

Founder of

How can you not love what Philip is doing?

Tons of actionable tutorials and content across the Jakarta EE and Spring universes.

Highly recommended!

Why You Should Invest Time in Learning How to Test Spring Boot Applications

When was your last outage or downtime caused by a bug that could have been prevented with a test? How much did your company lost in direct revenue or indirectly by losing customer satisfaction?

Putting in numbers is hard but I guess every minute a non trivial application is not working as expected results in costs or lost revenue of $ 1.000 - 10.000+

On the other side, consider how uncertainty paralyses you when you want to refactor an existing code base that lacks tests. Or you are new to a project and want to introduce a new feature. Testing things afterwards manually is a cumbersome and repetitive tasks. 

We as engineers are lucky to have tools around us that can automate such cumbersome and repetitive tasks. So let's start using them by learning how to effectively test our applications.

Once you know your testing toolkit, writing tests becomes joyful.

This Is What Each Module Covers In Detail 

Introduction to the Masterclass



Getting Started

Keeping the Course Content Up-to-Date

Application Setup


Setup for Java Development

Infrastructure Setup With Docker Compose

Application Walkthrough


Application Architecture

Maven Dependencies

Flyway Migration Scripts

Application Configuration

AWS SDK Overrides

Introduction to the Backend Code

Keycloak Configuration Walkthrough

Application Walkthrough

Testing With the Spring Boot Starter Test

Introduction to the Spring Boot Starter Test Dependency


Anatomy of the dependency

Managing library versions

Introduction to JUnit 5


Writing Your First Test With JUnit 5

Verify the Test Outcome With Assertions

Lifecycle of a Test

More on Assertions

Specifying the Name of a Test

Write Parameterized Tests

Your First JUnit 5 Extension

Happy-Path Testing

Parallelization of Tests

Introduction to Mockito


Introduction to the Class Under Test

Mocking Method Calls With Mockito

Your First Test With Mockito

Mocking the Behaviour of the Repository

Instrumenting a Mock to Throw an Exception

Full Happy-Path Test With Mockito

Capture Method Arguments and Verify Invocations

Additional Test Libraries of the Starter


Introduction to Hamcrest

Introduction to AssertJ

Introduction to JSONAssert

Introduction to JsonPath

Testing Database Access

The Secret Weapon to Test Your Database Layer: @DataJpaTest


Introduction to the JPA Domain Model

What to Test When Using Spring Data JPA

Start Using @DataJpaTest

Resolving context startup errors

Why and When to Use the TestEntityManager

Pitfalls of the First Level Cache

Transactional Support

Using P6SPY for More Insights

Replacing the In-Memory Database


The Rationale Behind Not Using In-Memory Databases

Using Testcontainers for the First Time

Managing the Lifecycle of a Container

Improve Build Times by Reusing Containers

Solutions to Pre-Populate Your Database

Testing the Native Query

Recap of the Database Access Module

Testing the Web Layer

The Secret Weapon to Test Your Web Layer


Why Unit Tests Are Not Enough

Introduction to @WebMvcTest

Getting the Setup Right

Defining On Which Level to Mock

Your First Test With @WebMvcTest

More Tests for the BookController

Advanced Usage


Introduction to the ReviewController

Verifying the First Behavior

Testing the First Secured Endpoint

Additional Ways to Provide Authentication

Happy-Path Testing For Creating Reviews

Ensure We Validate Incoming Reviews

Access to Role-Based Secured Endpoints

Recap and Learnings of This Module

Testing Further Slices of Our Application

Testing HTTP Clients Using the RestTemplate


Introduction to Testing HTTP Clients

The Power of @RestClientTest

First Test Using the MockRestServiceServer

More Assertions for the Happy-Path

Handling Partial Responses

Test a Failure of the Remote System

More Expectations on the HTTP Request

Testing HTTP Clients Using the WebClient


Required Setup for the MockWebServer

Testing the Happy-Path Using MockWebServer

Verify Behavior on Partial Responses

Testing Failure of the Remote System

Implement and Test Retry Mechanism for More Resiliency

Testing Business Logic in Isolation


Which Logic to Verify

Getting the Setup Right for Testing the ReviewService

Verify the First Error Scenario

Ensure We Don't Store Reviews With Bad Quality

Happy-Path Testing For Storing a Review

Testing a Custom Application Slice


Choosing the Application Part for Isolated Testing

Introduction to LocalStack

Creating a Spring Application Context With Only One Message Listener

Understanding the Spring Cloud AWS Auto Configuration

Overriding the AWS SQS Client

Creating a Local SQS Queue and Applying the Configuration

Happy-Path Testing For the Whole Listener Process

Recap on How to Create a Sliced Spring Context for Testing

Writing Tests With the Whole Spring Context

Remaining Setup to Start the Whole Spring Boot Application


What's Currently Missing to Start the Whole Context

Creating an Integration Test Profile

First Try to Start the Whole Context

Introducing WireMock to Mock HTTP Communication

Creating an ApplicationContextInitializer for WireMock

Mocking the OpenID Configuration Response

Mocking the JWKS (JSON Web Key Set) Response

Making Use Of the WebTestClient to Access the Backend

Creating a Valid JWT to Access Our Endpoints

Writing Integration Tests for Our Application


Verifying the Book Synchronization Process

Refactor Our WebClient to Mock the HTTP Response

Extract Integration Test Setup to a Central Place

Ensure Users Can Create Reviews

Develop the Missing API Endpoint Test-Driven (TDD)

Test the Statistics Endpoint With Reviews From Multiple Users

Recap of This Module About Integration Tests

Writing Web Tests

Providing the Whole Application Infrastructure


What's Missing Compared to Writing Integration Tests

Creating a Web Test Application Profile

Using Testcontainers to Start the Docker Compose Environment

Using Selenide to Write Concise Web Tests

Writing the First Test With Selenide

Making Screenshots During Test Execution

Further Hints on the Web Test Setup

Using Testcontainers With Selenide

Recording the Web Test With a Video

Test the Happy-Path User Journey


Inserting Reviews During the Web Test

Verifying the Outcome of the Test

Refactoring the Test to Page Objects

Recap on Writing Web Tests

Testing Best Practices

Naming and Test Strategies


Defining Your Own Test Strategy

Naming Conventions for Your Tests

Build Tool Configuration


Maven Surefire and Failsafe Plugin Configuration

Visualizing Test Results Within a CI Server

Reduce Build Times With Spring's Context Caching


Introduction to Context Caching

Context Caching in Action

Making the Most Of Spring's Context Caching

General Testing Advices


Working With Time

Mocking Static Method Calls

Using GitHub Actions for Your Project

Thank You for Completing the Masterclass

Module 1
  • course application walk-through (Book Reviewr)
  • understand the AWS setup for this application
  • get to know the OAuth2 setup of the application using Keycloak
Module 2
  • discover all testing libraries that the Spring Boot Starter Test includes
  • getting started with JUnit 5 (parallelization, custom extensions, etc.) 
  • writing assertions for JSON payloads using JSONAssert & JsonPath
Module 3
  • writing isolated tests for your database layer using @DataJpaTest
  • pitfalls when writing tests that include the EntityManger
  • use Testcontainers to write tests against your database
Module 4
  • effectively test your web-layer in isolation using @WebMvcTest
  • provide authentication with ease due to Spring Security Test
  • write tests against a mocked Servlet environment using MockMvc
Module 5
  • write tests for components that use the RestTemplate or WebClient
  • testing business logic in isolation
  • write custom test slices e.g. for the SQS subscriber and include only relevant beans to the Spring Test Context
Module 6
  • mock components that are required during application startup (e.g. identity provider, Salesforce, external APIs, etc.)
  • how to structure and what to write  integration tests for 
  • mock Keycloak or any other OAuth2 authentication server
Module 7
  • get rid of manual WebDriver setup efforts (Testcontainers & Selenide)
  • record the web test and make screenshots on-demand
  • start a Docker Compose environment for your end-to-end test
Module 8
  • tips & tricks around testing in general
  • making the most of Spring's Context caching to speed up your tests
  • practical advice for your test structure & naming conventions
Sneak Peek of One of the Final Automated End-To-End Tests
Testcontainers VNC Recording End-to-End test

Downloadable text/plain version of the entire Masterclass



Single-User License

plus VAT (where applicable)

Original Base Price $49

  • eBook version of the Masterclass
  • Free updates on new lessons
  • eBook formats: PDF, ePUB, and Mobi
  • Access to the real-world course application source code

I'm currently in the process of creating the eBook based on the Masterclass. 

Estimated release date: Fall 2021


Online course with 127 video lessons and 8h+ content



Single-User License

plus VAT (where applicable)

Original Base Price $247

  • Lifetime access to all eight modules of the Masterclass
  • Free updates on new lessons
  • Unit testing Spring Boot Applications
  • Writing efficient integration tests for all parts of your application
  • Writing web tests that verify your application end-to-end
  • Advanced testing techniques with Testcontainers, LocalStack, WireMock, Awaitility, Selenide, etc.
  • Access to the real-world course application source code
  • 127 video lessons with 8h+ content
  • Free Access to the Hands-On Mocking with Mockito Online Course ($39)
  • Free Copy of the Java Testing Toolbox ($29)

Get access to the online course and private coaching sessions



Single-User License

plus VAT (where applicable)

Original Base Price $667

  • Lifetime access to all eight modules of the Masterclass
  • Free updates on new lessons
  • Unit testing Spring Boot Applications
  • Writing efficient integration tests for all parts of your application
  • Writing web tests that verify your application end-to-end
  • Advanced testing techniques with Testcontainers, LocalStack, WireMock, Awaitility, Selenide, etc.
  • Access to the real-world course application source code
  • 127 video lessons with 8h+ content
  • Access to the private Slack workspace for Q/A sessions with the instructor
  • Four hour private coaching call (Zoom, Skype, etc.) with the course instructor (can be splitted into several sessions)
  • Free Access to the Hands-On Mocking with Mockito Online Course ($39)
  • Free Copy of the Java Testing Toolbox ($29)

Free Testing Resources On Top

How To Get Access

If you decide to enroll for the Testing Spring Boot Applications Masterclass, you'll get two additional testing-related resources on top for free.

This makes it the perfect testing bundle to kickstart your testing success.

You'll receive two emails with coupon codes to claim your free eBook copy and online course access after the purchase (approx. 30 - 45min).

Online Course about Mockito

Hands On Mocking With Mockito Course

Learn the ins-and-outs of the most popular mocking framework for Java applications build a solid foundation for your testing success.

  • Covering basic & advanced features of Mockito
  • Price: $39
  • Course length: 27 course lessons
  • More information

Testing Tools and Libraries

Testing Tools Book

Get a full overview of the Java testing ecosystem: test runner, assertion libraries, mocking frameworks, performance testing etc.

  • Enrich your testing toolbox as a Java developer
  • Price: $29
  • Currently 15/30 tools & libraries are covered
  • More information

100% Satisfaction Guarantee for 30-Days

You are not satisfied with the content of the Masterclass? No problem!

Contact me (via Mail, Slack, Twitter, etc.) within 30 days after you got access to the Masterclass and I'll send you a refund.

Please note that is only valid for the eBook and online course.

Don’t Wait! Look at What Past Students Have to Say About This Course

Michal Kupisinski

Michal Kupisiński

Professional IT Trainer - GitHub

Testimonial as a comment on the last course video

Philip, thank you very much for this course. It’s really great and full of valuable knowledge, examples, tips and good practices. It was a pleasure to learn from your experience.

Your course is very comprehensive and there’s a need to spend a lot of time to complete it but it’s worth every minute. To be exact I believe that after those many hours I saved weeks or months of self-learning.

Joined with the Early-Bird Batch #5

Anton Ždanov Full Stack Developer

Anton Ždanov

Full Stack Developer - LinkedIn

Testimonial via email

For me testing a Spring application seemed like a challenge involving digging through numerous blog posts, documentation for JUnit, Mockito, and Spring Testing Reference which provide valuable information but are spread out and don't necessarily show the best practices.

After watching the Testing Spring Boot Applications Masterclass course I feel more confident in writing different types of tests for my apps. The course, videos, and the GitHub repository were of invaluable use to me demonstrating various testing mechanics the Spring ecosystem provides, and I will keep referencing the course materials in the future.

P.S. The application that is tested in the course is quite complex and covers a lot of real-world testing challenges one might encounter, which I found immensely useful for seeing the bigger picture.

Björn Wilmsmann

Björn Wilsmann

Independent IT Consultant - Homepage

Detailed review of the Masterclass on his blog

The course is highly recommended for Spring Boot developers who want to move beyond basic unit testing and get familiar with both best practices and various testing frameworks and approaches.

Joined with the Early-Bird Batch #3

New to Testing Spring Boot Applications?

Frequently Asked Questions

How Long Does it Take to Complete the Courses?

As I recommend to code in parallel, I assume it takes you about 10 hours in total to work through this Masterclass and get the most of it.

Can I Get a Refund?

Yes, I offer a 30-days money-back guarantee for both the eBook and the online course.

If you've booked the coaching edition and already jumped on a call with me, the money-back guarantee expires.

What Is the Difference Between the Editions?

As every course student's skill level and preferred learning type is different, I want to offer several starting points to master Testing Spring Boot Applications.

In a nutshell:

eBook: Great for everyone that prefers to learn while reading. The eBook also allows to lookup testing strategies and recipes afterward quickly.

Online Course: Comprehensive online course with concise and short (5-15 minutes) video lessons. If you prefer a visual and (or) auditory learning style, this should be your edition of choice.

Coaching Edition: On top of the online course, you'll get four hours of private coaching. You can use this time to get feedback on your current test strategy, get help for a particular test setup, or even  pair program your tests with the course instructor.

Can I Upgrade to Another Edition?

Yes, drop me a message whether you want to upgrade to the online course or the coaching edition, and I'll create a personalized coupon code for you.

Is This Course For Me?

You are a Java developer, work with the Spring framework and want to write tests with joy?

Then it definitely is!

I won't explain what Spring and Spring Boot is all about as there are quite good resources for this available. I assume you have basic knowledge with Spring Boot and Java.

What Library Versions Are In Use?

I'm constantly updating all library version and try to be up-to-date. The source code (including the pom.xml) is publicly available on GitHub.

Right now they are:

  • Java 16
  • Spring Boot 2.5.0
  • Testcontainers 1.16.0
  • WireMock 2.29.1
  • Selenium 3.141.59
  • JUnit 5.7.1
  • Mockito 3.11.2
  • Awaitility 4.1.0
  • Selenide 5.23.0

Frontend-wise they are the following:

  • React 17.0.2
  • Typescript 4.2.4

last updated: 23th of July 2021

Can I Get a Discount as a Student?

Yes, just send me and email and attach a confirmation (e.g. a picture of your student identity card or a certificate of enrollment for this year) and I'll send you a personalized coupon code.

Where Can I Register?

If you already have an account for my online courses then you can reuse this account. Otherwise create your course account here (no payment info required, just email).

Where Can I reset My Password or Login?

If you forgot your password or want to reset it, you can request a new password here.

You can either login with your course account inside the course sections or here.

Do You Offer a Multi-User License?

If you are part of a team and want to use this course together with your co-workers, drop me a message and I'll offer you a reduced price per active user.

Do You Offer an Affiliate Program?


If you are convinced about the Masterclass and want to earn money, you can join as an affiliate.

You'll earn 30% commission for each sale that was made with your link (30 days cookie period).

Can I Watch a Demo Lesson?

Yes, subscribe to the newsletter and I'll send you four lessons from four different modules.

Not Convinced yet?

Let me send you four Masterclass lessons that are part of different Modules. This way you can see for yourself first-hand the quality of the lessons.

The Mission Behind This Masterclass

I believe this Masterclass can have an impact in the overall quality of the applications we write and use. Everybody is benefiting from less bugs and less outages as software is indispensable from our daily life .

As I'm also part of interviewing new candidates, I can see that basic testing techniques is something that almost every Junior Developer I interviewed is missing. Having such skills also uplifts your chances of getting a job. 

Not only does it make you a better engineer, but also once you apply the techniques presented in this Masterclass, your coworkers' skills will grow too. Let's spread the news that testing can be fun and is an essential tool of every serious engineer.

Have fun working with this Masterclass,

Your instructor,


Copyright  2021 - rieckpil