Is jCaptcha thread safe?

Question

I'm using JCaptcha in a project and needed a behavior that was not directly available. so I looked into the source code to see if I can extend it to obtain what I want and found that the store implementation I use (MapCaptchaStore) uses a HashMap as the store... with no synchronization.

I know JCaptcha does not work in a clustered environment, it is not my case, but how about multiple clients at the same time? Is the store implementation synchronized externally or should I roll my own and make sure it is properly synchronized?

TIA!

Answer 1

Judging by the reading source for MapCaptchaStore, this class is NOT thread-safe. I'm not 100% willing to stand behind this answer though, because synchronisation may be happening at a higher level (eg all accesses to a single instance of MapCaptchaStore may be synchronised on another object).

You could use another implementation of CaptchaStore. For example, EhcacheCaptchaStore