springboot @JsonValue cannot be placed on property

@Data
@Accessors(chain = true)
public class BookPowerEntity {
    private BookAggregateRootStatusEnum bookAggregateRootStatusEnum;
}

@AllArgsConstructor
@Getter
public enum BookAggregateRootStatusEnum {

    BOOK_ALL_READ(0, "全部可读") 
    ;

        @JsonValue
    private final Integer code;

    private final String message;

    @JsonCreator
    public static BookAggregateRootStatusEnum valueOfCode(int code) {
        return Arrays.stream(values()).filter(enu -> enu.getCode().equals(code)).findAny().get();
    }

@RestController
public class BookController {

    @PostMapping("book")
    public void create(@RequestBody BookPowerEntity bookAggregateRoot) {
        System.out.println(bookAggregateRoot);
    }
}

When I use this way, the access request reports an error, and I must add @ jsonvalue to the get method

Comment From: wilkinsona

Thanks for the report. Unfortunately, it's not clear to me why you think that this is a bug in Spring Boot. @JsonValue is a Jackson annotation with which Spring Boot isn't really involved. If you do think this is a Spring Boot bug, can you please explain why and provide a complete and minimal sample that we can use to reproduce the problem. You can share that sample with us by zipping it up and attaching it to this issue or by pushing it to a separate repository.

Comment From: yangle94

public static void main(String[] args) throws JsonProcessingException {
        String json = "{\n" +
                "\"bookAggregateRootStatusEnum\":0\n" +
                "}";
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.readValue(json, BookPowerEntity.class);
    }

I don't report an error when I use objectmapper directly, only when I use HTTP to request to access @ requestbody。So, I think there may be some problems in spring boot configuration。

Comment From: yangle94

Just a moment, please. I'll check

Comment From: yangle94

https://github.com/yangle94/jsonValueError

Please visit the repository. I have prepared two methods. One is to use objectmapper directly, and the other is to use HTTP to request access. The same JSON results in HTTP request error

Comment From: wilkinsona

Thanks for the sample. The ObjectMapper that you are using in each case isn't the same. The key difference in the HTTP case is that you are using Spring Boot's auto-configured ObjectMapper. This ObjectMapper has Jackson's ParameterNamesModule registered with it. You can reproduce the problem with no involvement from Spring Boot with the following code:

new ObjectMapper().registerModule(new ParameterNamesModule(JsonCreator.Mode.DEFAULT))
    .readValue("{\"bookAggregateRootStatusEnum\":0}", BookPowerEntity.class);

I'm not sure if you have found a bug in Jackson or if @JsonCreator needs to be used differently when the parameter names module is available. The Jackson team may be able to help you there.

If you don't need the functionality provided by the parameter names module, you can exclude it:

diff --git a/pom.xml b/pom.xml
index 5d36ee2..05250b8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -22,6 +22,12 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
+            <exclusions>
+                <exclusion>
+                    <groupId>com.fasterxml.jackson.module</groupId>
+                    <artifactId>jackson-module-parameter-names</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>

With the above change in place, I can make a post request:

$ curl -X POST -i localhost:8080/book -d '{"bookAggregateRootStatusEnum":0}' -H "Content-Type:application/json"
HTTP/1.1 200 
Content-Length: 0
Date: Thu, 26 Mar 2020 12:15:53 GMT

Comment From: yangle94

Thank you for your help

Comment From: cowtowncoder

If a test could be created by just isolating Enum with @JsonValue, using explicitly configured ObjectMapper, showing the issue with just Jackson (with or without Java 8 parameter names module), I'd happily look into issue on Jackson side (either using earlier reported issue or new one). I am not aware of issue wrt @JsonValue, Enums, but that does not mean there wouldn't be one. More common usage is to use annotation on getter method.

Comment From: cowtowncoder

I think I actually found the underlying problem, once surrounding question of Spring Boot is resolved, notes on:

https://github.com/FasterXML/jackson-modules-java8/issues/169

and TL;DNR: need to add mode = JsonCreator.Mode.DELEGATING to ensure delegating constructor used.

Comment From: wilkinsona

Thanks for taking a look, @cowtowncoder.