How to Implement Gateway Service something similar to Oracle API gateway Using Java and Java based Open Source frameworks only?

What the advantages and disavantages of using Java/J2EE for both web front end and app layer nowadays for big sites, as apposed to other major frameworks?

• I am really interested in finding out your experience of developing large sites using Java/J2EE, in terms of advantages and disadvantages, (as opposed to Python, Scala, and their frameworks, if any). Below are a few sites using Java/J2EE. Below is a related but different topic. Any advice and links would be very much appreciated.

• Answer:

  The reasons to not use Java on both frontend/backend could be: Sometimes the app servers required for a full JEE application can be an overkill. The test/deployment can be slower. Ruby, PHP, Python and others languages require less time and effort to get a website running. A large number of applications don't need technologies like messaging buses, distributed transaction support, timer services, etc. In some cases Ruby or PHP is just ok at the frontend. There are companies that use them, because their teams are more productive with them. On the other hand: Java has a lot of existing 3rd party libraries and very good documentation. Javascript libraries (jquery, backbone.js) used with Servlet 3 or Spring MVC is proven to be very productive and maintainable. It's possible to acquire high-scalability and performance using java in both layers just adding a caching mechanism (like memcached), database replication, sharding, moving away from the classic two-phase commit, etc. You can have a java developer working in both layers. Some companies I've worked have big applications made entirely in java (not big as facebook, twitter of course...) running fine. I think the trick to have a scalable application is to think beyond: Maintainable code is more easy to scale. Modularization is your friend. Break process into multiple process. System in subsystems. Don't get stuck to sessions. Move your sessions to a shared storage like a database or memcached.