How to run shell script from daemon in Ubuntu?

Hi,

I Installed java application as daemon using Apache Daemon(Jsvc).
Now I want to install [.deb] package from daemon for that I used following way.

1. From Java application(daemon) I use the following code to run shell script file

String[] s = {"/home/sushil/Desktop/Package Test/ShellScriptFile/RunShell1.sh", "install"};
            Process p = Runtime.getRuntime().exec(s);

2. In RunShell1.sh I write the following text to install package

#!/bin/sh
### BEGIN INIT INFO

installit() {
    echo "installing Java-package1.0 ..."
 eval "dpkg -i Java-Package-1.0.deb"
}

uninstallit() {
    echo "uninstalling ava-package1.0 ..."
    eval "sudo dpkg -r Java-Package-1.0"
}

and other stuff to execute the installation process.

When I run the above shell script file from the Normal Java Application it works fine(installation success).
but similar script I run from the Daemon then it not working (Installation failure).

I don't know what is going wrong when I try same code from daemon.
If any one have any Idea regarding this please reply to post ASAP