I am having trouble accessing the main class of my application that is embedded in a package, several directories down (within a jar). I have several questions:
How do I set the class path?
How do I invoke the embedded main class?
The developers guide does not discuss the JNLP file resource elements "package" and "extension". Is the syntax published? Is this part of the equation?
You should look at the "Java Network Launching Protocol & API Specification," it's a pdf document available on the Web Start site.
The "package" tag can be ignored- it's used with lazy downloading to instruct the loader on which packages are placed in which jar.
The "extension" tag, on the other hand, is useful. When using a signed application, ALL of the application's jars have to be signed. The way to avoid having to sign a utility jar that doesn't need secure access is to make it into an extension: create a JNLP file referencing the jar WITHOUT the <j2se version="1.3+"> and with a <component-desc/> tag instead of <application-desc/>. In the application's JNLP file, load the extension with the tag
<extension name="Extension Name" href="extensionfile.jnlp">
</extension>
instead of <jar href="extensionfile.jar">.
To answer your actual question, though, you can specify the main class with the tag
<application-desc main-class="package.Class"/>.
Jonathan