[FIXED] Spring Rest Controller: Accept single object and array under one URL

Issue

Assuming there is a REST Controller with an endpoint that accepts a single object in the body:

@PostMapping("/ExampleObjects")
void mapping(@RequestBody ExampleObject object){ ....

If one would want to add the ability to accept an array under the same endpoint like this:

@PostMapping("/ExampleObjects")
void mapping(@RequestBody ExampleObject[] objects){ ....

Is there a way to implement the new functionality with the given design and without breaking existing users?

Solution

That should help you.

application.properties:

spring.jackson.deserialization.accept-single-value-as-array=true

controller:

@PostMapping("/ExampleObjects")
void mapping(@RequestBody List<ExampleObject> objects){ ....

Answered By - frombrest