description:
need to use keytool and jarsigner
C:\> keytool -genkey -validity
C:\> keytool -selfcert -validity
C:\> jarsigner test.jar mykey
http://www.ccw.com.cn/htm/center/prog/02_7_8_4.asp
http://www.owasp.org/index.php/Signing_jar_files_with_jarsigner#Create_a_new_DSA_Key_Pair_for_Bob
Not all the detail, it will be edit later but you can use the upper command to finish it.
signed jar for web start application.