Brief expalantion springboot   Userservice: public User getUser() {   Stringusername=SecurityContextHolder.getContext().getAuthentication().getName();   /* Get User from the DB. */ returnthis.userRepository.findByUsername(username) .orElseThrow(()->newUserNotFoundException(String.format("Username doesn't exist, %s",username))); } ================================================================================= User controller: @GetMapping("/get") publicUsergetUser(){   logger.debug("Getting User Data");   returnthis.userService.getUser(); }

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.