java.lang.IllegalArgumentException: No converter found for return value of type

Question

With this code

@RequestMapping(value = \"/bar/foo\", method = RequestMethod.GET)
    public ResponseEntity foo() {

        Foo model;
        ...         


        

Answer 1

In my case i'm using spring boot , and i have encountered a similar error :

No converter for [class java.util.ArrayList] with preset Content-Type 'null'

turns out that i have a controller with

@GetMapping(produces = { "application/xml", "application/json" })

and shamefully i wasn't adding the Accept header to my requests