How write java batchprocess running from tomcat

How write java batchprocess running from tomcat

I'm writing spring web application that is running on TomCat.7 and one of
functionality will be a processing data from db using java.concurrency.
I expect that db processing will be a very time dealing because of
calculations, and I need high performance for this process.
My question is if it is good idea (or maybe only possibility) to run that
thread in TomCat container?
@RequestMapping(value = "run_process", method = RequestMethod.GET)
public RequestWrapper runProcess(ModelMap model) {
Runnable runCrawler = new Crawler();
runCrawler.run();
System.out.println("##run_process!");
return new RequestWrapper();
}
My project structure is like:
-src
-com.scanner.batchprocess
-com.scanner.crawler
-com.scanner.webapp.controllers

I don't have any experience in creating programs that are challenging
computationally, so I'm afraid that maybe I should create new clean java
project with main class that will be called from webapp whenever user run
BatchProcess. Can be a significant time difference in execution time
application from Tomcat than True java application?