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  • If you really want to keep things simple and not trip up the next guy that reads your code, just convert your List<Device> to a List<Map<String, Object>> yourself and just put the correctly formatted string in the field you'd like it to be. This way you don't have to familiarize yourself with the ever-changing magical workings of Jackson. I know that might not be an option if Device has many fields, but just wanted to float the option :). Commented Oct 17, 2018 at 16:50
  • Well if you use Spring Boot half the things are magical and can get you tripped over if wrongly configured. The JSR310 configuration has become 'standard' boilerplate you have to do for Java 8 Time support since I posted this question. Maybe in the future the Jackson library will do this by default. Commented Oct 18, 2018 at 9:08