Have anyone done porting COBOL application to ABAP and J2EE?

Hi all,
(Hi Stefan Klensch: this is my next question:-))
I am a newby in the SAP world and just walking around a few days.
The problem I am facing is porting a large COBOL application to ABAP and mapping the generic business functions of that COBOL application according to the business process involved to adequate functions of the CRM- and HRM suites.
AND
The required customization of strategic business domain knowledge must be implemented in the J2EE domain e.g. for portability reasons. So at the end of the day I will have a SAP J2EE application and the above mentioned SAP ABAP solutions.
Yes, I want to use UML for the analysis and design (e.g. clas/component diagrams) because UML diagrams give me an better architectural (and maintainable) view and design of the system.
I am looking for the rare developer(s) who did such a kind of challenging job before. I hope they can give me hints and information the way they handled and solved such a problem. E.g. roadmap, methods, tooling, etc.
Many thanks in advance.
Thiel Chang

etresoft,
I downloaded the sample code for EvenBetterAuthorizationSample project and I changed the userid for the Developer id application as suggested by Apple below and built it, but still when I run the app and click on the "Read License" button or other buttons I get the error NSCocoaErrorDomain 4099 connectionInvalid
Before you build you need to adjust some Info.plist values to match your Developer ID. Specifically, search the entire sample code directory hierarchy for all instances of "SKMME9E2Y8" and replace it with the User ID value from your "Developer ID Application" certificate.
As far as I can tell, the sample app is properly code signed with our certificate along with the helper tool
Is there something else I need to change to get this sample app working so I can understand this better

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https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/b52456bd-0a01-0010-6d9b-f153bf15a82f
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