in messaging/src/main/java/com/google/firebase/quickstart/Messaging.java [235:249]
public static void main(String[] args) throws IOException {
if (args.length == 1 && args[0].equals("common-message")) {
sendCommonMessage();
} else if (args.length == 1 && args[0].equals("override-message")) {
sendOverrideMessage();
} else {
System.err.println("Invalid command. Please use one of the following commands:");
// To send a simple notification message that is sent to all platforms using the common
// fields.
System.err.println("./gradlew run -Pmessage=common-message");
// To send a simple notification message to all platforms using the common fields as well as
// applying platform specific overrides.
System.err.println("./gradlew run -Pmessage=override-message");
}
}