Doubt Springboot + Restful

Question

I’m having a problem with my Rest requests.

Until a while ago my code was working normally, but one to two weeks ago, my requests stopped working, except for GET and Delete methods

GET 
@RequestMapping(value = "/api/estabelecimentos", method = RequestMethod.GET, produces = "application/json")
        public @ResponseBody List<Estabelecimento> getAllEst() {
            return er.findAll();
        }

Delete
    @RequestMapping(method = RequestMethod.DELETE, value = "/api/estabelecimentos/{id}", produces = "application/json")
        public ResponseEntity<Estabelecimento> deleteEst(@PathVariable Long id) {
            er.deleteById(id);
            return new ResponseEntity<Estabelecimento>(HttpStatus.OK);
        }

The other methods (POST and PUT) return error 415 via client (Postman) and in the springboot log I get this return;

POST
@RequestMapping(method = RequestMethod.POST, value = "/api/estabelecimentos", produces = "application/json")
    public ResponseEntity<Estabelecimento> newEstabelecimento(@RequestBody Estabelecimento estabelecimento) {
        er.save(estabelecimento);
        return new ResponseEntity<Estabelecimento>(estabelecimento, HttpStatus.OK);
    }

PUT
@RequestMapping(method = RequestMethod.PUT, value = "/api/estabelecimentos/{id}", produces = "application/json")
    public ResponseEntity<Object> updadeEstabelecimento(@RequestBody Estabelecimento esta, @PathVariable Long id){
        Optional<Estabelecimento> estab = er.findById(id);

        if(!estab.isPresent()) 
            return ResponseEntity.notFound().build();

        esta.setCod_Estabelecimento(id);
        er.save(esta);
        return ResponseEntity.noContent().build();
    }

Log Springboot
14:24:36.716  WARN 14320 --- [nio-8080-exec-1] .c.j.MappingJackson2HttpMessageConverter : Failed to evaluate Jackson deserialization for type [[simple type, class com.api.Entity.Estabelecimento]]: com.fasterxml.jackson.databind.JsonMappingException: Multiple back-reference properties with name 'defaultReference'
2019-05-22 14:24:36.720  WARN 14320 --- [nio-8080-exec-1] .c.j.MappingJackson2HttpMessageConverter : Failed to evaluate Jackson deserialization for type [[simple type, class com.api.Entity.Estabelecimento]]: com.fasterxml.jackson.databind.JsonMappingException: Multiple back-reference properties with name 'defaultReference'
2019-05-22 14:24:36.724  WARN 14320 --- [nio-8080-exec-1] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported]

Retorno Clien(Postman)
"timestamp": "2019-05-22T17:24:36.740+0000",
    "status": 415,
    "error": "Unsupported Media Type",
    "message": "Content type 'application/json;charset=UTF-8' not supported",
    "trace": "org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported\r\n\tat org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:224)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:157)\r\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:130)\r\n\tat org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgumen

Can anyone give me a light ? I couldn’t find anything on the internet

Answer 1

I decided as follows.

After analyzing Nullptr’s response, I was able to understand better what it was about

added a value for classes with relationship

Ex: Class A @Jsonmanagedreference(value = "identification name")

Class B @Jsonbackreference(value = "identification name")

Answer 2

The mistake that really matters in stacktrace is this:

com.fasterxml.jackson.databind.JsonMappingException: Multiple back-reference properties with name 'defaultReference'

You own or have added Annotation @JsonBackReference or @JsonManagedReference in your entity incorrectly.

Utilize @JsonManagedReference for collections and @JsonBackReference for simple relationships.

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About the 415 - Unsupported Media Type, this was discussed in this and in this Spring thread, I agree it’s not the best error handling for a parse error (in my opinion it should be 422).