1.pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.7</version>
        <relativePath />
    </parent>
    <groupId>com.gzz</groupId>
    <artifactId>netty</artifactId>
    <version>1.0</version>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jaxb</groupId>
            <artifactId>jaxb-runtime</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2.代码

在jdk8中以下代码可以不加任何额外依赖就能正常使用，可是到了jdk17中就不管用了，其实是缺少了jaxb-runtime依赖，加上就可以正常用了

package com.gzz.netty;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlRootElement;

import lombok.Getter;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class MarshallerTest {
    public static void main(String[] args) throws Exception {
        JAXBContext jc0 = JAXBContext.newInstance(A.class);

        OutputStream os = new FileOutputStream("c:\\1.xml");
        Marshaller m = jc0.createMarshaller();
        A a = new A();
        a.setId("id for a");
        B b = new B();
        b.setNo(60);
        a.setB(b);
        m.marshal(a, os);

        InputStream is = new FileInputStream("c:\\1.xml");
        Unmarshaller u = jc0.createUnmarshaller();
        A o = (A) u.unmarshal(is);
        log.info("o.getB().getNo()={}", o.getB().getNo());
    }
}

@Setter
@Getter
@XmlRootElement
class A {
    private String id;
    private B b;
}

@Setter
@Getter
class B {
    private int no;
}