jaxb - 线程 "main"中的异常 javax.xml.bind.JAXBException : Provider com. sun.xml.bind.v2.ContextFactory 无法实例化

Question

我正在尝试测试 JAXB 解码器/编码器。这是我的代码

JAXBContext context = JAXBContext.newInstance(ClientUser.class.getPackage().getName());

和我的实体的代码

@XmlRootElement(name = "user")
public class ClientUser {
    private String name;

    public ClientUser() {}

    public ClientUser(String name) {
        this.name = name;
    }

    @XmlElement(name = "name")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

即使我添加到实体类工厂类

@XmlRegistry
class ObjectFactory {
    ClientUser createPerson() {
        return new ClientUser();
    }
}

我仍然不断收到此异常

Exception in thread "main" javax.xml.bind.JAXBException: Provider com.sun.xml.bind.v2.ContextFactory could not be instantiated: javax.xml.bind.JAXBException: "com.example.ws.poc.entity" doesnt contain ObjectFactory.class or jaxb.index
 - with linked exception:
[javax.xml.bind.JAXBException: "com.example.ws.poc.entity" doesnt contain ObjectFactory.class or jaxb.index]
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:146)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:335)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:431)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:394)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:298)

我该如何解决这个错误？

Answer 1

JAXB 实现不进行包扫描。如果您从包名引导，JAXB 将查找 ObjectFactory (用 @XmlRegistry 注释)或 jaxb.index包含短类名的文件，每个都在一个新行上。

如果您没有这两个项目，您可以创建 JAXBContext在域类本身上。

JAXBContext jc = JAXBContext.newInstance(Foo.class, Bar.class);