Run the jar tool without arguments to see its usage. You pass it the -M option to create a JAR without a manifest. You won't be able to run the JAR file with java -jar, but you will still be able ...

Digitally sign JARs with jarsigner When distributing applications as JAR, EAR or WAR files, it’s a good practice, especially if other users are downloading your archives over the public internet, to ...

You must create a JAR folder in your project, then specify the JAR file you want to include in your application. The JAR is automatically included with the app when you run it on your device.