Accessing and Moving files in the Cached Location

Question

I am having trouble accessing jar files in the cached location where WebStart puts files after an install.
I cannot do the following:
1. Start a separate process within the main process using a jar file brought over by WebStart.
See the jnlp file below, the jar file I want to run as a separate process is second.jar.
2. Move a jar file from the cached location to some other location on disk.
All of this is attempted on my own machine with Admin rights.
Here is the jnlp file:
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+"
codebase="http://server/test/"
href="test.jnlp">
<information>
<title>Test App</title>
<vendor>None</vendor>
<homepage href="home.html"/>
<description>Install the Client Application</description>
<description kind="short">This is a description, kind = \"short\"</description>
<description kind="tooltip">This is a description, kind = \"tooltip\"</description>
<icon href="img/chart.gif"/>
</information>
<security><all-permissions/></security>
<resources>
<j2se version="1.4+"/>
<jar href="main.jar" main="true"/>
<jar href="second.jar"/>
</resources>
<application-desc main-class="MainApp"/>
</jnlp>

Answer 1

I'm having a few problems following your suggestion. We have main.jar and second.jar. In your solution you say to access some file in the jar, for me this is second.jar. I added a file called chart.gif to second.jar.
The following code is inside main.jar to access chart.gif inside second.jar:
URL url = getClass().getClassLoader().getResource("images/chart.gif");
I verified that images/chart.gif is bundled inside second.jar by doing a "jar tf second.jar".
The problem is when I re-load the updated jar files, and run the client app, the URL is null.
I think your idea is to access any file in the other jar file to get at the url, and finally to get at the path
of the jar file and execute it inside main.jar.
So I am not able to access a resource that is in second.jar from main.jar.