you need to sign your jar file
in steps
i got it from javaCook book
Recipe 23.14 Signing Your JAR File
1-Create a new key in a new "keystore" as follows:
keytool -genkey -keystore myKeystore -alias myself
The program prompts you in the terminal window for information about the new key
2-Create a self-signed
test certificate:
keytool -selfcert -alias myself -keystore myKeystore
You enter the keystore password and keytool generates the certificate.
3-You can now sign the JAR file with your test certificate:
jarsigner -keystore myKeystore test.jar myself