How to Fix "IntelliJ IDEA Code Completion Not Working"

If code completion is not working in IntelliJ IDEA, it could be caused by misconfigured settings, missing project dependencies, or corrupted caches.

Here's how to fix it: First, ensure that code completion is enabled in IntelliJ IDEA.

Go to File > Settings > Editor > General > Code Completion and check that the Autocompletion options are properly configured.

Make sure that Basic Completion and Smart Completion are enabled.

If these settings are correct but code completion still doesn’t work, the issue may be with your project dependencies.

IntelliJ IDEA relies on project dependencies to provide relevant suggestions during code completion.

Ensure that your project is correctly configured and that all necessary dependencies are included.

For example, if you’re working with Maven or Gradle, make sure that your pom.xml or build.gradle files are properly configured and up to date.

You can refresh the dependencies by right-clicking on the project and selecting Maven > Reimport or Gradle > Refresh Project.

If you’ve recently added new dependencies, ensure that IntelliJ has indexed the new libraries.

Sometimes, IntelliJ may fail to index new libraries or files properly.

In this case, try invalidating the caches by going to File > Invalidate Caches / Restart and clicking Invalidate and Restart.

This will clear out any corrupted caches and force IntelliJ to rebuild its index.

Another possible reason for code completion issues is a large project that IntelliJ struggles to index.

If you have a large project with many files, try excluding unnecessary directories or files from indexing by going to File > Settings > Directories, and marking folders like build directories or temporary files as Excluded.

Finally, check if there are any conflicting plugins that may be interfering with code completion.

Disable any unnecessary plugins by going to File > Settings > Plugins and unchecking plugins you don’t need.

After following these steps, code completion should work as expected in IntelliJ IDEA.