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 was returning Boolean in Response Entity and had :

produces = MediaType.TEXT_PLAIN_VALUE,

When i changed it to below

produces = MediaType.APPLICATION_JSON_VALUE

It worked!

Example of what i had.

@PostMapping(value = "/xxx-xxxx",
            produces = MediaType.APPLICATION_JSON_VALUE,
            consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity yyyy(