Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
Refactor Java code safely — and automatically — with OpenRewrite.
Refactoring big codebases by hand is slow, risky, and easy to put off. That’s where OpenRewrite comes in. The open-source framework for large-scale, automated code transformations helps teams modernize safely and consistently.
Each month, the creators and maintainers of OpenRewrite at Moderne run live, hands-on training sessions — one for newcomers and one for experienced users. You’ll see how recipes work, how to apply them across projects, and how to modernize code with confidence.
Join the next session, bring your questions, and learn how to automate the kind of work that usually eats your sprint time.
Yes, we're now running our only Summer Sale. All Courses are 30% off until 20th July, 2026:
Yes, we're now running our only Summer Sale. All Courses are 30% off until 20th July, 2026:
1. Overview
Gradle is the build tool of choice for millions of developers around the globe and is the official build tool for Android applications.
We usually use Gradle to download dependencies from the network, but sometimes we can’t access the network. In these situations, Gradle’s offline mode will be useful.
In this short tutorial, we’ll talk about how to achieve offline mode in Gradle.
2. Prepare
Before going for the offline mode, we need to install Gradle first. And then we need to build our applications to download all their dependencies, otherwise, we will fail when we try using the offline mode.
3. Offline Mode
We usually use Gradle in command-line tools or IDEs (like JetBrains IntelliJ IDEA and Eclipse), so we mainly learn how to use offline mode in these tools.
3.1. Command-Line
Once we’ve installed Gradle in our system, we can download dependencies and build our applications:
gradle buildAnd now, we can achieve the offline mode by adding the –offline option:
gradle --offline build3.2. JetBrains IntelliJ IDEA
When we use IntelliJ, we can integrate and configure Gradle with it, and then we’ll see the Gradle window.
If we need to use the offline mode, just go to the Gradle window and click the Toggle Offline Mode button:
After we click the button to enable offline mode, we can reload all dependencies and find that offline mode works.
3.3. Eclipse
Finally, let’s see how to achieve the offline mode in Eclipse. We can find the Gradle configuration in Eclipse by navigating to the Preferences -> Gradle section. We can see the Offline Mode config and toggle it off:
As a result, we’ll find that the offline mode works in Eclipse.
4. Conclusion
In this quick tutorial, we talked about the offline mode in Gradle. We learned how to enable offline mode from the command line, as well as from two popular IDEs: Eclipse and IntelliJ.
