IntelliJ IDEA tutorials

Learn how to create, run, and package a simple Java application in IntelliJ IDEA. This tutorial introduces coding assistance and essential tools designed to support productive Java development.

Learn how to run a Java application, create run/debug configurations, save output, and customize VM options to suit your workflow.

Use IntelliJ IDEA’s debugger and real-time code analysis to identify and resolve issues efficiently, so you can maintain reliable, clean code.

Create your first Kotlin project, write code with coding assistance, and build the application using one of the supported build tools.

Write tests first and evolve your code incrementally, helping you build reliable and modern Kotlin applications with strong test coverage.

Learn how to debug Kotlin applications using integrated tools that help you quickly trace and fix issues during development.

Apply structural search and replace to your Kotlin code. This tutorial covers how to customize templates, use match filters, and define inspections to enforce consistent coding patterns.

Create and run a simple Spring Boot application using IntelliJ IDEA’s project wizard and Spring Initializr. Expose an HTTP endpoint and run the app using run configurations and Maven.

Learn how IntelliJ IDEA helps you write, analyze, and manage Spring applications at runtime. This tutorial uses a Spring Boot Maven project and demonstrates how the IDE supports development through smart assistance and integrated tools.

Use Docker Compose to run a Spring Boot application alongside a MySQL database in separate containers. Learn how to configure services, expose endpoints, and debug the application directly from IntelliJ IDEA.

Build a simple Jakarta EE web application with a JSP page and servlet, and learn how to deploy it using IntelliJ IDEA's built-in server integration.

Create and deploy a simple RESTful service using IntelliJ IDEA and Tomcat, and access it using a browser or HTTP client.

Practice test-driven development (TDD) in IntelliJ IDEA and learn how to write, navigate, and run unit tests.

Learn how to set up JUnit in your project, write tests, and run them to verify your code. The tutorial contains the essential steps to get you started with unit testing.

Use the Set Value feature in the debugger to change variable values at runtime. This feature helps simulate specific conditions and troubleshoot issues without modifying your code.

Attach the debugger to a local or remote process to inspect and troubleshoot application behavior outside your development environment.

Debug and analyze multithreaded applications in IntelliJ IDEA. Follow a sample scenario to help you understand and troubleshoot concurrency issues that may appear sporadically and are harder to detect.

Create Git repositories from your projects, share them on GitHub, commit and push changes, create and merge branches, resolve merge conflicts, and investigate the files' history.

Add Maven support to a Java project and use it to manage builds and dependencies. This tutorial guides you through converting an IntelliJ IDEA project into a Maven one.

Create a new Gradle project, run and test your code, and execute the packaged JAR file using Gradle.

Publish a Java library from a Gradle project to a local Maven repository, and then to a remote one. This helps you reuse and share your code across multiple projects and development environments.

Configure a Gradle project for working with the Java Native Interface (JNI), including native code setup and build customization.

Build a WAR file and deploy it to an application server like Tomcat or WildFly running in a Docker container.

Learn how to create a Docker image for a compiled Java application. This tutorial covers packaging, running the containerized app, and sharing the image to support reproducible and portable deployment.

Use a Docker integration to run and debug a Java application inside a container. This tutorial shows how to create a Docker run target and debug your application in an isolated, reproducible environment.

Use Docker to run a database in a container as if it were a remote server and test how your application interacts with it.

Use Docker and Docker Compose to run an application server container and deploy your Java web application for testing and debugging. This tutorial shows how to configure Tomcat with a mounted WAR, expose the debugger port, and connect from IntelliJ IDEA.

Learn how to configure and manage deployment of your code to remote hosts step-by-step using IntelliJ IDEA.

Create a Python project for scientific computing. Learn how to run, debug, and visualize data using IntelliJ IDEA’s support for Python and built-in scientific tools.

Learn the basics of working with Spark: create a simple Spark application, build it with Gradle, upload it to an AWS EMR cluster, and monitor jobs in Spark and Hadoop YARN.

Write and run tests for Go applications using the popular Testify package.

Import a Ruby on Rails project and configure the environment. This tutorial walks you through running, debugging, and working with Rails applications in IntelliJ IDEA.

Connect to a sample database and get familiar with database tools, designed to simplify querying, browsing, and managing data in the IDE.

Configure IntelliJ IDEA as your default merge tool for resolving version control conflicts. Resolve differences using the IDE's diff viewer for a more efficient and intuitive experience.

Connect IntelliJ IDEA to a task tracker through a generic server configuration. Fetch and display issue details directly in the IDE to stay focused while managing tasks.

Use structural search and replace to locate and modify patterns in your codebase. Learn how to define templates, add filters, and create custom inspections for more precise and maintainable refactoring.

Learn how to use the UI Designer to build Swing-based graphical user interfaces. Create a form, configure components, and connect the layout to Java code to build a simple desktop application.