Making class available to bootstrap loader? interesting twist.......

Question

We're deploying our jar wrapped in an exe (created by exe4j). It's not an option to unwrap the jar, but I want to make a particular class available to the bootstrap loader. If you're not familiar with exe4j, you can pass arguments to the jvm, so I can pass an -Xbootclasspath argument, but I have no idea how that works when the class is in a package in a jar in an exe. I've tried to pass arguments like -Xbootclasspath/a:com.organization.project.package.MyClass and of course it didn't work. Note that what I'm doing is security policy related, and I'd really prefer not to have this class outside of the wrapped jar.
Is what I want to do actually possible? If so, what am I doing wrong?

Answer 1

Erm, sorry for being unclear :s
I'm doing my best to explain myself, please excuse me for not being a native english speaker ;)
About showing more code, I wouldn't know which part to show : several classes are involved already, each of them weighing a couple hundred lines. That's why I prefer explaining rather than dropping unrevealing code snippets. :-x
If from this description you know what piece of code interests you, I'll post it asap. Until then, here goes a shorter explanation of the situation.
My custom ClassLoader loads .class entries from jar files using the java.util.jar package. I define those classes using defineClass(String name, byte[] b, int off, int len). At the same time entries from the jar file get processed, I list the classes which could or couldn't be loaded. The second list being empty once the jar is processed proved me the classes are well-loaded.
Then I seek through the list of loaded ones for classes implementing AIPlayer, Player or other interfaces. My problem is that the classes implementing AIPlayer (c in my previous example) can't get assigned to AIPlayer though they can get assigned to Player, Player being a super-interface of AIPlayer.
Additionnal information are : Player and AIPlayer are loaded by the bootstrap ClassLoader, the bootstrap ClassLoader being the parent of my custom ClassLoader's instance at some degree (it is either the parent or the parent of the parent).
My question is : why can not a class implementing AIPlayer (and thus, Player) be assigned to AIPlayer, though it can be assigned to Player ?
I hope I was clearer here. Thanks for lending me your time.