JsonMappingException: Can not deserialize instance of java.lang.Integer out of START_OBJECT token

Question

I wanted to write a small and simple REST service using Spring Boot. Here is the REST service code:

@Async
@RequestMapping(value = \"/getuser\", method = POS         


        

Answer 1

Perhaps you are trying to send a request with JSON text in its body from a Postman client or something similar like this:

{
 "userId": 3
}

This cannot be deserialized by Jackson since this is not an Integer (it seems to be, but it isn't). An Integer object from java.lang Integer is a little more complex.

For your Postman request to work, simply put (without curly braces { }):

3