Spring Boot-Jersey Client-Jackson无法构造`java.time.instant‘的实例

Question

使用Jersey Client2.28，我试图接收一个包含以下数据的DTO：

{
    "entityId": "0de46a94-bc95-437f-9eca-dcfd60f7aed3",
    "productId": "9c328c45-deba-4b84-8fb4-0d2aea885fc0",
    "status": "ACTIVE",
    "startDatetime": "2020-05-12T08:54:23Z",
    "endDatetime": null,
}

当收到它时，我得到以下错误：

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `java.time.Instant` (no Creators, like default construct, exist): no String-argument constructor/factory method to deserialize from String value ('2020-05-12T08:54:23Z')
 at [Source: (org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$UnCloseableInputStream); line: 1, column: 190] (through reference chain: com.fundraiser.dto.OfferDto["startDatetime"])

我知道我应该能够在没有大量自定义序列化程序或适配器的情况下检索回此内容。在谷歌上，似乎还有其他密切相关的问题，但没有一个解决我的问题：

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jdk8</artifactId>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
</dependency>

<dependency>
  <groupId>org.glassfish.jersey.media</groupId>
  <artifactId>jersey-media-moxy</artifactId>
  <version>2.28</version>
</dependency>

<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.0.RELEASE</version>
  </parent>

  <groupId>com.test</groupId>
  <artifactId>test-webapp</artifactId>
  <version>1.0.0</version>
  <packaging>jar</packaging>
  <name>test-webapp</name>
  <url>http://maven.apache.org</url>

  <dependencies>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.8</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.core</groupId>
      <artifactId>jersey-client</artifactId>
      <version>2.28</version>
    </dependency>
    <dependency>
      <groupId>org.glassfish.jersey.inject</groupId>
      <artifactId>jersey-hk2</artifactId>
      <version>2.28</version>
    </dependency>
    <dependency>
      <groupId>com.test</groupId>
      <artifactId>test-client</artifactId>
      <version>0.0.1-SNAPSHOT</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
      <version>2.3.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <version>2.3.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-security</artifactId>
      <version>2.3.0.RELEASE</version>
    </dependency>
  </dependencies>

  <properties>
    <java.version>11</java.version>
  </properties>

  <build>
    <finalName>test-webapp</finalName>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>11</source>
          <target>11</target>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>repackage</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
    <defaultGoal>install</defaultGoal>
  </build>
</project>

用于检索数据的代码：

 public TestClient() {
        this.client = ClientBuilder.newBuilder().register("application/json, */*").build();
    }

    private WebTarget webTarget() {
        return client
                .target(baseUri)
                .path("api")
                .path("v1");
    }

    private WebTarget entityTarget() {
        return webTarget()
                .path("entity");
    }

    public DataDto getEntityById(@NonNull UUID entityId) {
// Error occurs here
        return entityTarget()
                .path(entityId.toString())
                .request(MediaType.APPLICATION_JSON)
                .get(DataDto.class);
    }

更新：添加的Dto类：

package com.test.dto;

import lombok.Data;
import lombok.experimental.Accessors;

import java.time.Instant;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

@Data
@Accessors(chain = true)
public class DataDto {
    private UUID entityId;
    private UUID productId;
    private String status;
    private Instant startDatetime;
    private Instant endDatetime;
}

Answer 1

尝试注册Jackson config provider以序列化Jaxrs客户机中的jsr310对象，请查看此处。

目前，我还找不到一个完全符合您要求的例子，但是Jersey、rest easy和Apache CXF都有自己的客户端注册机制，您应该参考它们的详细文档。

更新：我刚刚更新了一个Spring/Jersey示例，演示如何解决这个问题，检查测试代码，注册一个自定义Jackson上下文解析器，使用Spring配置的JacksonObjectMapper处理Java8DateTime，然后可以使用IOS格式对Java8DateTime对象进行序列化/反序列化。