Software⏱️ 2 min read📅 2026-06-03

How to Fix: Intellij - Unable to use newer Java 8 classes - Error : "Usage of API documented as @since 1.6+.."

Learn how to fix: Intellij - Unable to use newer Java 8 classes - Error : "Usage of API documented as @since 1.6+..".

Quick Answer: Try checking your system settings or restarting.

In order to resolve the 'Usage of API documented as @since 1.6+' error in IntelliJ for Java 8 classes, you need to update your project's JDK version.

⚠️ Common Causes

  • Insufficient or outdated JDK version for Java 8.

🔧 Proven Troubleshooting Steps

Method 1: Update JDK Version

  1. Step 1: Go to File -> Project Structure (or press Alt + Shift + S) and navigate to Project Settings.

Method 2: Use the IDE's built-in JDK version manager

  1. Step 1: In the Project Structure window, navigate to SDKs and click on the '...' button next to your project's SDK.

✨ Wrapping Up

By following these steps, you should be able to resolve the 'Usage of API documented as @since 1.6+' error and successfully use newer Java 8 classes in your IntelliJ project.

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