Help building patched android framework

I am new to Android platform development. I have just succeded building Cyanogenmod 7 sources after applying a patch, which adds extra jars to the system (fit into /system/framework directory).

After flashing the device 开发者_开发问答and checking that the new custom jars are there, and decompiling (extracting classes.dex and running dex2jar) just to verify that the needed classes are there, I see my test program crashing due to ClassNotFound exceptions.

Since the compiled custom java sources seem ok, have I missed something in the building process so my applications can use these new framework classes?

UPDATE:

I realized that framework jars are included inside an environment variable called BOOTCLASSPATH, which is defined in init.rc. I modified it to include the new jars from SEEK project (smartcardapi.jar and org.simalliance.openmobileapi.jar). I rebuilt the image and flashed my phone.

The device now does not start. I have read something here about class optimizations that are run against BOOTCLASSPATH classes. The advice is not to mess with BOOTCLASSPATH.

But what can I do so my applications can use the extended API classes defined in the new jars?