有没有办法编码(marshal)/解封以下用户实体对象？ 一些特殊的注释？
抽象类中的User是编辑User-Entity-Object的用户。 这两个用户是相同的，这是完全合法的。 执行以下代码将抛出以下异常:
org.eclipse.persistence.exceptions.XMLMarshalException
异常描述:对象图中检测到循环
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlRootElement;
import org.eclipse.persistence.jaxb.JAXBContextFactory;
import org.eclipse.persistence.jaxb.MarshallerProperties;
import org.eclipse.persistence.oxm.MediaType;
public class UserApp {
public static abstract class AbstractEntity {
private Long id;
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public void setId(Long id) {
this.id = id;
}
public Long getId() {
return id;
}
}
@XmlRootElement
public static class User extends AbstractEntity {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public static void main(String[] args) throws JAXBException {
UserApp userApp = new UserApp();
User user = new User();
user.setId(1L);
user.setName("Jim");
user.setUser(user);
String marshalledUser = userApp.marshal(user);
System.out.println(marshalledUser);
User unmarshalledUser = userApp.unmarshal(User.class, new StringReader(marshalledUser));
}
private String marshal(Object toMarshal) throws JAXBException {
JAXBContext jc = JAXBContextFactory.createContext(new Class[] {toMarshal.getClass()}, null);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.setProperty(MarshallerProperties.MEDIA_TYPE, MediaType.APPLICATION_JSON);
StringWriter sw = new StringWriter();
marshaller.marshal(toMarshal, sw);
return sw.toString();
}
private <T> T unmarshal(Class<T> entityClass, StringReader sr) throws JAXBException {
JAXBContext jc = JAXBContextFactory.createContext(new Class[] {entityClass}, null);
Unmarshaller unmarshaller = jc.createUnmarshaller();
unmarshaller.setProperty(MarshallerProperties.MEDIA_TYPE, MediaType.APPLICATION_JSON);
return (T) unmarshaller.unmarshal(sr);
}
}
最佳答案
目前，MOXy 不支持映射两个方向使用相同属性的双向关系。您可以使用下面的链接来跟踪我们在此问题上的进展:
关于java - EclipseLink MOXy，对象图中的循环，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20473182/