osgi - Suitable frameworks for ERP like application -

I want to create a production management system for use by a small manufacturing firm. The system will allow you to write different steps in the creation of the device as follows: 1. Non browser based interface. Something based on swing or adwt. When I understand the convenience of implementing a browser-based solution, the business owner insists on a non-browser interface
access to multiple systems These systems will allow CRUD operation on the central system (thin client?) The app will not have more than 3 concurrent users.
I would like some advice on what would be a good way for such an application. Currently, I'm thinking of using Griffon with RMI. However, I do not have much development experience. Read anything about the Apache River (Gene). Would it be good to use Griffon with RI?

Please give some advice Thank you.
Edit: After reading something, I have decided to use a more mainstream framework. Therefore, Griffon is not an option. How about Gene (Apache River) or OSGI (Apache Felix)?

Understanding your current problem, I will not recommend the OSG, especially a small manufacturing firm (Potential maintenance issues based on "personal")

The main reason why I am not a living or OSGI advocate in your case because of what you have said

  However, I have more Development is not an experience.   
 Genie (Apache River) is a viable option, as long as you fully understand the concepts of  lookup service  and service registration. There are so many RMIs going on with possible firewall effects ...  
 OSGI is not difficult, but you can decide how to structure your applications, as well as interact with the services.  
 The simplest way to implement  which you can handle : Keep the flexible design in mind:  Do it and then repair it .  
 Simple web services options (such as for example on http / https), as long as Spring brings too many concepts and headaches to your app.