Question

我正在尝试序列化和反序列化大对象图。为了减小生成的JSON的大小，我以为我会使用Jackson的@JsonIdentityInfo批注，从我的阅读看来，该批注似乎对于该特定用例非常有效。

但是，当我添加它会炸毁它时，无论何时它尝试反序列化它以前遇到的对象时，都会爆炸。我猜这是因为我缺少SimpleObjectIdResolver的某些配置，但是我无法完全弄清楚自己在做什么错。示例代码如下：

Main.class

@Data
@Builder
@JsonDeserialize(builder = Main.MainBuilder.class)
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class)
public class Main {

    private final String name;
    @Singular
    private final Map<String, Main> mains;

    public static void main(String[] args) throws IOException {
        var one = Main.builder().name("one").build();
        var test = Main.builder()
                .name("Root")
                .main("one", one)
                .main("two", Main.builder()
                        .name("two")
                        .main("one", one)
                        .build())
                .build();

        var om = new ObjectMapper();
        var result = om.writeValueAsString(test);
        System.out.println(result);
        var back = om.readValue(result, Main.class);
        System.out.println(back);
        System.out.println(back.mains.get("Two").mains.get("one") == back.mains.get("one"));
    }

    @JsonPOJOBuilder(withPrefix = "")
    @JsonIgnoreProperties(ignoreUnknown=true)
    public static class MainBuilder {
    }
}

build.gradle

plugins {
    id 'java'
    id 'application'
}

repositories {
    jcenter()
    mavenCentral()
}

sourceCompatibility = 11
targetCompatibility = 11

mainClassName = 'dk.acto.Main'


dependencies {
    compileOnly 'org.projectlombok:lombok:1.18.0'
    implementation 'com.fasterxml.jackson.core:jackson-databind:2.9.7'
    annotationProcessor "org.projectlombok:lombok:1.18.0"
}

与lombok Builder一起使用Jackson，@ JsonIdentityInfo和@JsonDeserialize时出现MismatchedInputException

0 个答案: