title: Are methods in a Singleton class thread safe?
body: <p>Is Concurrent method access in singleton class thread safe?</p>
  
  <p>I am using Spring framework (MVC) with the default scope as Singleton.</p>
  
  <p>For example, if the controller of my web application is a Singleton class, are the methods declared to access Model/Business/DB classes thread safe, if accessed by multiple threads at the same time? How about calls to DB for database access/update from these methods in the Controller?</p>
  
  <p>Need guidance and I aprreciate any help/suggestions for this issue.</p>