JavaCard OS

I want to develop a library like the java card development kit.

I am developing two packages:
a. javacard.framework (methods in package a invoke method/class in package b)
b. com.sun.java.impl (methods in package b also invoke method/class in package a)

I want to make the library for java card.

Q:
How can I build those two packages and have sufficiently class files, export file and CAP file of both the packages?

You can not do that. When you load package to the card.
When load package a, it needs package b loaded first;
When load package b, it needs package a loaded first!