Are methods in a Singleton class thread safe?

Question

Is Concurrent method access in singleton class thread safe?

I am using Spring framework (MVC) with the default scope as Singleton.

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?

Need guidance and I aprreciate any help/suggestions for this issue.

Answer 1

No, Singleton does not guarantee thread safety. You have to manage that yourself.

The best way to do it is to make Singleton's stateless. If there's no shared state you're fine.