Convert a string date from json to Java LocalDate

Question

I use spring boot and spring 4.

@EntityScan(basePackageClasses = {ServerApplication.class, Jsr310JpaConverters.class})
@SpringBootApplication
@EnableCaching
public class ServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(ServerApplication.class, args);
    }
}

I try to use Java 8 LocalDate.

In the json for the date i have

birthdate: "1969-12-29"

On the server side for this field i have

@DateTimeFormat(iso=DateTimeFormat.ISO.DATE)
private LocalDate birthdate;

I get this error

org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Can not instantiate value of type [simple type, class java.time.LocalDate] from String value ('1969-12-29'); no single-String constructor/factory method

Edit

Dto send via ajax

public class LodgerInformationDto {
    private Long lodgerId;
    private String firstName;
    private String lastName;
    @DateTimeFormat(iso=DateTimeFormat.ISO.DATE)
    private LocalDate birthdate;
}

Controller Rest class

    @RequestMapping(value = "/lodgers", method = RequestMethod.POST)
    public LodgerInformationDto createLodger(@RequestBody @Valid final LodgerInformationDto lodgerDto) {
        return lodgerService.save(lodgerDto);
    }

with this dependencies: com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.6.3

this line in the application.properties spring.jackson.serialization.write-dates-as-timestamps=false

that work.

I hope you recognize that your current solution is what I suggested. @DateTimeFormat does nothing in that case. Also, that property you added serves no purpose for the deserializing you're doing. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Nov 22, 2015 at 0:36

Sotirios Delimanolis · Accepted Answer · 2015-11-21 02:12:44Z

4

@DateTimeFormat is meant to be used with model attributes (command objects), not JSON bodies.

From your question,

In the json for the date i have

it seems you are submitting the date as part of the request body, as JSON.

There is an entirely different process that handles JSON deserialization. Typically, that is a MappingJackson2HttpMessageConverter assuming you have Jackson on the classpath.

For this to work with Jackson, you'll need a Module that supports Java 8 types. There is this one and this one. These know how to deserialize JSON content into Java 8 date-time types.

You can use @JsonFormat to provide a date format.

answered Nov 21, 2015 at 2:12

Sotirios Delimanolis

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2 Comments

robert trudel Over a year ago

DateTimeFormat can be used on PathVariable, RequestBody... For the Java 8 type, i added Jsr310JpaConverters.class that the class who add the support in spring. Date is in a DTO.

Sotirios Delimanolis Over a year ago

@roberttrudel For @PathVariable sure. For @RequestBody, it depends on the underlying HttpMessageConverter. Jackson knows nothing about @DateTimeFormat. Your Jpa converter is just that, a JPA converter. There's nothing here that involves JPA.

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