RestTemplate should be static globally declared?

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It doesn’t matter either way, static or instance.

RestTemplate‘s methods for making HTTP requests are thread safe so whether you have a RestTemplate instance per Task instance or a shared instance for all Task instances is irrelevant (except for garbage collection).

Personally, I would create the RestTemplate outside the Task class and pass it as an argument to a Task constructor. (Use Inversion of Control whenever possible.)

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