Thread Safety of ServletContext objects

Question

I am storing a HashMap object in my ServletContext. But Multiple Request thread are reading and Modifying this HashMap.

As i belive the ServletContext objects are sh

Answer 1

As Suggested by @Artem Moskalev, You can use ConcurrentHashMap and use putIfAbsent method to store the object/values instead of simple put method.

I wanted to add this comment below @Artem Moskalev's answer but i don't have enough reputation for this.