Java org.springframework.web.HttpMediaTypeNotAcceptableException:找不到可接受的表示法“；错误

我这样称呼JSON：

$(function() {
                    $("select#accountsubgroupid").change(function() {
                        alert('admin URL ----'+adminUrl);
                        $.getJSON("<%=request.getContextPath()%>/admin/jassg.htm?search=",{accountSubGroupId: $(this).val(), ajax: 'true'}, function(accountSubGroup){                          
                           alert('success---'+accountSubGroup.code);
                        });
                    });
                });  

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将以下请求放在映射中：

@RequestMapping(method = RequestMethod.GET, value = "/jassg.html", produces = "application/json")

@RequestMapping(method = RequestMethod.GET, value = "/jassg.html", produces = "application/json")