Runnable JAR file

A JAR file can be set up in such a way that it could be started using the java command. This is only possible if the JAR file was configured correctly to allow this. In this case, the JAR file specifies which class contains the main() method that will be run by the java command.

This is a convenient feature for end users, as a single JAR file is completely self-contained:

• A JAR file contains all the required dependencies
• Manually setting the ClassPath is not necessary (or even possible) at all
• A user does not have to manually tell the JVM which class contains the main() method