Setting an Entry Point with the JAR Tool 




The 'e' flag (for 'entrypoint') creates or overrides the manifest's Main-Class attribute. 
It can be used while creating or updating a JAR file.
Use it to specify the application entry point without editing or creating the manifest file.
For example, this command creates app.jar where the Main-Class attribute value in the manifest is set to MyApp:

jar cfe app.jar MyApp MyApp.class 

You can directly invoke this application by running the following command:

java -jar app.jar