Скачать или смотреть How to Fix IntelliJ Java Autocomplete Issues

Struggling with `IntelliJ's autocomplete` feature? Discover actionable steps to troubleshoot and resolve autocomplete issues in IntelliJ IDEA seamlessly.
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This video is based on the question https://stackoverflow.com/q/69249838/ asked by the user 'Crabby Fish' ( https://stackoverflow.com/u/14636954/ ) and on the answer https://stackoverflow.com/a/69251023/ provided by the user 'VeryNice' ( https://stackoverflow.com/u/8386475/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix IntelliJ Java Autocomplete Issues: A Comprehensive Guide

As a developer, there's nothing more frustrating than an IDE (Integrated Development Environment) that doesn't perform as expected. If you're using IntelliJ IDEA and have encountered issues with Java autocomplete—where it only suggests local functions and ignores imports—you’re not alone. This problem can hinder your productivity and slow down your coding process, particularly after taking a break from a project. In this guide, we will explore a common scenario that many developers face and provide a clear solution to help you get back on track.

The Problem

A user recently returned to coding with IntelliJ and found that the Java autocomplete feature was severely malfunctioning. Here’s a summary of the symptoms observed:

Autocomplete suggestions were limited to local functions and basic keywords.

All imported libraries were ignored.

IntelliJ failed to mark erroneous code that would typically generate an error.

Despite trying various troubleshooting methods including switching JDK versions, restarting the IDE and computer, reinstalling IntelliJ, and deleting project-specific settings, the user was still faced with the same frustrating issue.

User Environment

Operating System: Windows 10

Java Development Kit: JDK 11

IDE Version: IntelliJ Community Edition

Now, let’s dive into how you can resolve these issues.

The Solution

Step 1: Marking the Source Folder

One of the simplest yet often overlooked solutions to get autocomplete working correctly is ensuring that your source folders are properly marked in the project settings. Here’s how you can do this:

Open IntelliJ IDEA: Start up your IDE and load your project.

Locate the Project pane: Typically found on the left side of the window.

Right-click on your Source Folder: This is usually where your Java code resides (look for directories containing your .java files).

Select "Mark Directory as": From the context menu that appears.

Choose "Sources Root": This tells IntelliJ that this folder contains source files that should be included in the compilation process.

Step 2: Verify Project Structure

After marking your source folder, it’s good practice to check your project structure:

Go to File Project Structure.

Under Modules, ensure that the settings align with your project needs such as dependencies and configurations.

Step 3: Review Settings

Sometimes, the IDE might have settings that prevent proper functionality:

Navigate to File Settings (or Ctrl + Alt + S).

Check under Editor General Code Completion. Ensure all desired options are checked to enhance autocomplete features.

Step 4: Re-index your Project

IntelliJ may need to re-index your project for changes to take effect fully:

Go to File Invalidate Caches / Restart.

Choose Invalidate and Restart to clear caches and refresh the indexing process.

Conclusion

By following these simple steps, you can troubleshoot and fix the autocomplete issues you’re facing in IntelliJ IDEA. Ensuring that your source folder is marked as a "Sources Root" is essential for IntelliJ to recognize your project structure correctly. With a fully functional autocomplete feature, you’ll be back to coding efficiently in no time!

If you’ve tried these solutions and still encounter challenges, don’t hesitate to explore the JetBrains support forums or consider reaching out for professional help. Happy coding!