Spring boot jackson java.time.Duration

Question

I have create a restful web service and i try to send post request the above class

public class A {
    Duration availTime;
}

public class MyRest {
    @RequestMapping(value = "/test", method = RequestMethod.POST)
    public Response<?> test(@RequestBody A ta) {
        return new ResponseEntity<>(HttpStatus.OK);`
    }
}

raw request body

{
  "availTime": {
    "seconds": 5400,
    "nano": 0,
    "units": [
      "SECONDS",
      "NANOS"
    ]
  }
}

expected json result

 {"availTime": "PT1H30M"}

and i got the above error : Failed to read HTTP message:

org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unexpected token (START_OBJECT),
expected one of [VALUE_STRING, VALUE_NUMBER_INT, VALUE_NUMBER_FLOAT] for java.time.Duration value; nested exception is
com.fasterxml.jackson.databind.exc.MismatchedInputException: Unexpected token (START_OBJECT), expected one of [VALUE_STRING, VALUE_NUMBER_INT, VALUE_NUMBER_FLOAT] for java.time.Duration value

Answer 1

As exception says java.time.Duration can be created only from int, float or string but you are providing a Json object.

Define your Duration class as

public class Duration {

    private long seconds;
    private long nano;
    private List<String> units;

    // setters / getters
}

Now your request will map from class A

Edit 1
In case you still want to map to java.time.Duration, then you need to change your request body.
Case 1 (int)

• Request Body

  { "availTime": 5400 }

• Output

  {"availTime":"PT1H30M"}

Case 2 (float)

• Request Body

  { "availTime": 5400.00 }

• Output

  {"availTime":"PT1H30M"}

Case 3 (string)

• Request Body

  { "availTime": "PT5400S" }

• Output

  {"availTime":"PT1H30M"}

For all above three cases to work add dependency

<dependency>
  <groupId>com.fasterxml.jackson.datatype</groupId>
  <artifactId>jackson-datatype-jsr310</artifactId>
  <version>2.8.8</version>
</dependency>

Class A should be modified as

public class A {

    private Duration availTime;

    // for json output of duration as string 
    @JsonFormat(shape = Shape.STRING)
    public Duration getAvailTime() {
        return availTime;
    }

    public void setAvailTime(Duration availTime) {
        this.availTime = availTime;
    }
}

To Print request body as json

ObjectMapper mapper = new ObjectMapper();
mapper.findAndRegisterModules();
System.out.println(mapper.writeValueAsString(ta));

If you still want to map your existing request body, then you need to write your custom deserializer for Duration class.

Hope it helps.