How to solve the certificate problems in Java Web Start

Hi, All,
I encounted these two problems recently:
(1) I have an application which is supposed to be started by Java Web Start. I have written my own code which calls other .jar files from other companies. Since for web start, you need to sign all .jar files if you want more permssions. Now I got the following problem:
'=================================
An error occurred while launching/running the application.
Title: My stuff
Vendor: UCLA
Category: Launch File Error
JAR resources in JNLP file are not signed by same certificate
=================================
How to go around this? It seems that the .jar files from that company has been signed already. Then I tried to uncompress those jars and re-archieve again, then sign it again using the keystore I used to sign my own .jar files. It still does not work. Any help on this will be appreciated!
(2) Afterr I signed a .jar file, when I want to run it again, using command: java -jar abc.jar
It does not work any more, I am not sure whether it will become a problem if loaded by Web start.
Thanks a lot!
David

In another forum answer, a user named Dietz suggested the following:
If you have a library signed by another signer, you need to factor it out into a seperate extension jnlp file.
AJones0131

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    Seguridad Firewall (cortafuegos)
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    Dirección IP Filtro / Filtro de dirección MAC / filtro de dominio
    Conexiones de direcciones IP y MAC
    Management
    Control de acceso
    Manejo Local
    Manejo remoto
    Certificación
    CE, FCC, RoHS
    Contenido del Paquete
    TL-WR740N
    1 fijo antenas omnidireccionales
    Fuente de alimentación
    CD de recursos
    Guía de instalación rápida
    Requisitos del Sistema
    Microsoft ® Windows ® 98SE, NT, 2000, XP, Vista ™ o Windows 7, Mac ® OS, NetWare ®, UNIX ® o Linux.
    Ambiente
    Temperatura de funcionamiento: 0¿ ~ 40¿ (32¿ ~ 104¿)
    Temperatura de almacenamiento: -40¿ ~ 70¿ (-40¿ ~ 158¿)
    Humedad de funcionamiento: 10% ~ 90% sin condensación
    Humedad de almacenamiento: 5% ~ 90% sin condensación

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