How do you convert the LocalDate field to Json?

Question

Context

I have controller test . I trying to convert object UserDto to Json using to Gson.

Problem

Gson can't convert field birthday which is type LocalDate. It showing me error message: failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unexpected token (START_OBJECT), expected VALUE_STRING: Expected array or string.; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Unexpected token (START_OBJECT), expected VALUE_STRING: Expected array or string. at [Source: (PushbackInputStream); line: 1, column: 76] (through reference chain: com.user.management.domain.User["birthday"])

@Test
public void createUser() throws Exception {
    //Given
    GroupOfUser groupOfUser = new GroupOfUser();
    groupOfUser.setId(1L);
    groupOfUser.setName("test_name");
    User user = new User();
    user.setId(1L);
    user.setFirstName("test_firstName");
    user.setLastName("test_lastName");
    user.setBirthday(LocalDate.of(2011,1,1));
    user.getGroupOfUsers().add(groupOfUser);
    Gson gson = new Gson();
    String jsonContent = gson.toJson(user);
    when(userService.saveUser(any(User.class))).thenReturn(user);
    //When && Then
    mockMvc.perform(post("/v1/users")
            .contentType(MediaType.APPLICATION_JSON)
            .characterEncoding("UTF-8")
            .content(jsonContent))
            /*.andExpect(jsonPath("$.id",is(1)))*/
            .andExpect(jsonPath("$.firstName", is("test_firstName")))
            .andExpect(jsonPath("$.lastName", is("test_lastName")))
            .andExpect(jsonPath("$.date", is(2018 - 1 - 1)));
}

Thank you in advance for your help

Converting the date to timestamp and storing it in JSON is the best option for such scenarios. Also is the code in Java? May be a java developer can confirm, add a tag for the same as I am not sure if it is. — Saurabh Harwande, Apr 18 '18 at 11:02
Possible duplicate of [Serialize Java 8 LocalDate as yyyy-mm-dd with Gson](https://stackoverflow.com/questions/39192945/serialize-java-8-localdate-as-yyyy-mm-dd-with-gson) — ghn1712, Aug 23 '18 at 21:04

score 8 · Answer 1 · answered Aug 23 '18 at 13:51

Include in your pom.xml:

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.5</version>
</dependency>

Then in your User.java import ToStringSerializer as follows:

import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;

And finally, always in your User.java file, annotate the interested dates like this:

@JsonSerialize(using = ToStringSerializer.class) 
private LocalDate birthday;

score 0 · Answer 2 · answered Aug 23 '18 at 21:03

0

Unfortunately GSON doesn't have a support for local date time, so you will need to create your custom serialize, as did here https://stackoverflow.com/a/39193077/9091513

answered Aug 23 '18 at 21:03

ghn1712

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How do you convert the LocalDate field to Json?

2 Answers2