javascript - Thymeleaf form not returning json object -


my html page not retrieving payload in form of json object. instead returning string. help

html code snippet:

<form th:object="${case}" novalidate="true" data-model="case" action="/hcp/patient/details/insurance" method="post">

controller: 

@requestmapping(             value = {"/hcp/patient/details/insurance"},             produces = "application/json",             method = {requestmethod.put, requestmethod.post})     final @responsebody string updatepatientinsurance(final httpservletrequest request,             @requestbody string payload,                bindingresult bindingresult) throws invalidformexception, exception {

explicitly rendered tab when accessing solved issue.

p.s: render function converts payload json object

formcontroller.render(tabcontent, url);

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