servlet based framework like Playframework
This is a quite generic question. I am trying to build a cloud based web-app which does not have any Data access layer nor the business layer. The business logic is retrived from business modules hosted separately by my customers. What I am trying to do is just an orchestration layer which takes the request from UI sends it to the business module for data processing and responds it back to the user through UI. The UI related files are in a remote location and loaded dynamically by orchestration layer. I considered spring + spring webflow as a first choice and it is only getting too complex with loads of xml's to be configured. I considered Playframework but my application is already based on servelet technologies and re-developing the whole applicatio is not a small job. So, can someone suggest me some kind of framework that suits my job ? I am even open to code a framework from scratch.. Please throw some light on this idea. 
servlet based framework like Playframework
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This is a quite generic question. I am trying to build a cloud based web-app which does not have any Data access layer nor the business layer. The business logic is retrived from business modules hosted separately by my customers. What I am trying to do is just an orchestration layer which takes the request from UI sends it to the business module for data processing and responds it back to the user through UI. The UI related files are in a remote location and loaded dynamically by orchestration layer. I considered spring + spring webflow as a first choice and it is only getting too complex with loads of xml's to be configured. I considered Playframework but my application is already based on servelet technologies and re-developing the whole applicatio is not a small job. So, can someone suggest me some kind of framework that suits my job ? I am even open to code a framework from scratch.. Please throw some light on this idea. 