This question is to compare EJB Singleton bean and Stateless bean in the case both them are Threadsafe (No state holding OR Readonly State). I thought they can be used for the same purpose ( in case they are threadsafe). If I understand wrong, can someone let me know what are differences between them in my case? When to use which one? Thanks.
EJB threadsafe Singleton bean VS EJB threadsafe Stateless bean
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Singletons maintain their state across client invocations, so there is no reason for using them to access read-only state or for no state holding processing. Common scenarios for singletons are configuration reading and/or initialization tasks at application startup or shutdown, or accessing shared resources in a thread-safe way. Moreover there is a difference in performance and scalability, singleton beans are instantiated only once and process every single request sequentially, whereas stateless beans can be pooled and can process more requests concurrently.