Resolve "Project JDK Not Defined" Error in IntelliJ IDEA

Introduction

When creating a Java project in IntelliJ IDEA, you may encounter the "Project JDK Not Defined" error. This error occurs when the IDE cannot find the Java Development Kit (JDK) needed to compile and run your project. In this article, we will guide you on how to resolve this error and set up the JDK in IntelliJ IDEA.

Step 1: Open Project Structure

Go to the "File" menu and select "Project Structure" (or use the shortcut ctrl+alt+shift+S).

Step 2: Configure SDKs

In the "Project Structure" dialog box, navigate to "Platform Settings" and select "SDKs".

Step 3: Check Existing JDKs

Check if the JDK you want to use is already listed in the "SDKs" section. If it is, select it and click "Apply" to save the changes.

Step 4: Add New JDK

If the desired JDK is not listed, click the "Add SDK" button. In the "Add SDK" dialog box, select "JDK" from the dropdown menu and specify the path to the JDK home directory.

Step 5: Set Project JDK

Once the JDK is added, navigate to the "Project Settings" section in the "Project Structure" dialog box. In the "Project SDK" field, select the JDK you want to use for your project and click "Apply" and then "OK" to save the changes.

Conclusion

Follow these steps to set up the JDK in IntelliJ IDEA and resolve the "Project JDK Not Defined" error. By correctly configuring the JDK, you ensure that your project can be successfully compiled and run within the IDE.