异常描述：
"exception": "org.springframework.http.converter.HttpMessageNotReadableException",
"message": "JSON parse error: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token\n at [Source: java.io.PushbackInputStream@1180a866; line: 1, column: 1]",
出现这种错误应该是json的格式错误；
json格式key:value
前台json传输：
[ ] 代表List,; {}表示对象
例如 List<Model>, 其中model表示一个对象 model(string,list<String>);
json格式：
[
{
"modelName":"test",
"list":[
"id",
"xxx"
]
}]