How to Run a JAR File on Mac — Terminal Command and Fixes

Run a JAR on macOS with java -jar filename.jar. Install Java, fix 'cannot be opened' Gatekeeper warnings, 'Unable to access jarfile' and 'no main manifest attribute', on Intel and Apple Silicon.

Step 1: Check You Have Java

Step 2: Run the JAR From the Terminal

Step 3: Run by Double-Clicking

Troubleshooting Common Errors

Inspect a JAR Before Running It

Summary