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UserDetailsService provide user infromation from databse like id, pw
pw is encrypted by PasswordEncoder
AuthenticationPrvoider use UserDetailService and PasswordEncoder to authenticate
Authentication details are stored in SecurityContext
default Filter
notice , just like diagram , Inside a Filter AuthenticationManager authenticate and then set the result to SecurityContextHolder
we only gave UserDetailService then Spring complains that we didn't give proper PasswordEncoder
always need to give both of them
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