How to send List value in Request Body to Rest Api

Question

Hi i have written a Rest Service to accept List of Long values as input via RequestBody and the code for the same is given below:

@DeleteMapping("/files")
public ResponseEntity<?> deletefiles(@RequestBody List<Long> ids) {
     fileService.deleteSelectedfiles(ids);
     return ResponseEntity.ok().build();
}

When i try to hit the above url from Postman i am getting the below error:

"JSON parse error: Cannot deserialize instance of `java.util.ArrayList` out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: [![enter image description here][1]][1]Cannot deserialize instance of `java.util.ArrayList` out of START_OBJECT token\n at [Source: (PushbackInputStream); line: 1, column: 1]"

In Postman i am sending data as Raw data in the following format

{"ids": [1 ,2]} 

Can anyone help me on this

Answer 1

Your payload is expected to be a

[1 ,2]

Instead of

{"ids": [1 ,2]}

The first option is a json array and the second example is a json body. You can use the first one with your @RequestBody List<Long> ids or the second one with @RequestBody YourData data where

class YourData {
    List<Long> ids
}

Answer 2

@RequestMapping(YOUR_REQUEST_MAPPINGS)
public void testArrayOfValues(@RequestParam List<String> values) 
{
  
}