If you are deploying a JAR application, it should be named *app.jar* so that the built-in image can correctly identify your app. (The Maven plugin does this renaming automatically.) If you do not wish to rename your JAR to *app.jar*, you can upload a shell script with the command to run your JAR. Then paste the full path to this script in the [Startup File](app-service-linux-faq.md#built-in-images) textbox in the Configuration section of the portal. **Note:** The startup script does not run from the directory into which it is placed. Therefore, always use absolute paths to reference files in your startup script (e.g. `java -jar /home/myapp/myapp.jar`).