Why Are My IntelliJ IDEA JAR Files Empty or Incomplete, and How Do I Fix Them?

Jarring with IntelliJ IDEA: A Comprehensive Guide

Creating JARs (Java Archive files) is crucial for packaging and distributing Java applications. When working with IntelliJ IDEA, it's essential to understand the proper way to build JARs to avoid empty or incomplete outputs.

Why Are My JARs Empty or Incomplete?

By default, IntelliJ IDEA's "build JAR" process doesn't automatically include dependencies. As a result, if your project contains dependencies, they won't be present in the JAR.

Building JARs in IntelliJ IDEA

To build a JAR that includes dependencies:

1. Go to: File > Project Structure > Project Settings > Artifacts
2. Click the (plus sign) button and select Jar
3. Choose From modules with dependencies...
4. Select the Main Class if you want the JAR to be runnable
5. Check the Extract to the target JAR box
6. Click OK to save the Artifact configuration
7. Finally, go to: Build > Build Artifact > Build

Navigating to the JAR

Once the JAR is built, you can find it in the following location:

?ProjectName
┗ ?out
  ┗ ?artifacts
    ┗ ?ProjectName_jar
      ┗ ?ProjectName.jar

Additional Resources

For further guidance, consult the IntelliJ IDEA documentation:

• [Compiling Applications](https://www.jetbrains.com/help/idea/compiling-applications.html#package_into_jar)
• [Creating JAR Artifacts](http://blogs.jetbrains.com/idea/2010/08/quickly-create-jar-artifact/)

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