DocumentBuilderFactory code signing issue

After resolving the outofmemory issue, my code still won't run. I got another exception saying: Error starting : Module must be signed with the RIM Runtime Code Signing Key (RRT).

Hmm, I was pretty sure that I am not using any signed API, but out of 3000 lines of code, it is very much possible to miss one or two. JDE 4.2.1 has a feature that can outline all the signed API calls. It helps only if I can get it working.

Before I eyeball the code line by line, I did a google search and found this post. Ahha, it is a bug in JDE. The DocumentBuilderFactory falsely requires code signing (fixed in 4.2 and higher). Now my only way out is to buy a sign key from RIM.