Multiple User Application

I need to create a monitoring and reporting application.

Rule is, in this application select query alone should be used in all modules.
No update or insert should be used.
All db inserts will be made by other application. search alone required using my application. Multiple users may search same data in same time

My doubt is whether concurrency implementation is required for this application? If so kindly suggest easiest way to achieve this.

Struts2 + DAO + Factory