In practice, you might want to use one or more of the command options that are available. This basic command will overwrite the original JAR file with the signed JAR file. It will create signature and signature block files with names x.SF and x.DSA respectively, where x is the first eight letters of the alias, all converted to upper case. This basic form of the command assumes that the keystore to be used is in a file named. The Jarsigner tool will prompt you for the passwords for the keystore and alias.
