How to Import Modules and Build JAR Files in IntelliJ IDEA

IDEA Import Project Module

1. Create an empty project

To import a Module you first need a project because modules exist under a project in IDEA.

Here we create an empty project for demonstration; if you already have a project the process is the same.

2. Import Module

Locate the project directory on your local disk:

3. Associate the Module with the current project

These three steps import the required Module into the project; a project can import multiple Modules.

You can also open a module directly:

IDEA Package Java Program into JAR

1. Select the Module to package

Click File → Project Structure → Artifacts

Explanation: Main Class – click the small icon to choose the class containing the main method (e.g., App).

Explanation: Set META-INF/MANIFEST.MF . Click the arrow icon to configure; defaults are fine.

Explanation: If an error appears, a META-INF folder already exists. Delete the existing folder via Explorer (right‑click the module → Open in → Explorer).

If no error occurs, you will see a "puzzlegame:jar" prompt. Click OK.

2. Build the JAR artifact

Click, and the following dialog appears:

3. Locate the built JAR

Click File → Project Structure → Artifacts. The generated JAR can be found at the path highlighted in the screenshot.