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For many reasons, it is not good practice to use threads inside a servlet.
java.util.Timer seems like wrapper around a thread. So, is it also not safe to use it?
If so, what is the safest way to schedule a task in a servlet?
Yes, you can use Timers.
One important thing to remember is to cancel that Timer when the servlet is stopped. If you forget to cancel the Timer, your webapp will suffer from memory leaks (classloader leaks, since the Timer’s Thread is bound to the WebappClassLoader via its ContextClassLoader) and cannot be deployed multiple times.