<Product>
    <Code>code</Code>
    <Desc>description</Desc>
</ProductInfo>

@XmlElement(name = "Product/Desc")
private String description;

@XmlElement(name = "Product/Code")
private String code;

import javax.xml.bind.annotation.*;
import org.eclipse.persistence.oxm.annotations.XmlPath;

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Foo {
    
    @XmlPath("Product/Code/text()")
    private String code;
    
    @XmlPath("Product/Desc/text()")
    private String description;

}

import java.io.File;
import javax.xml.bind.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Foo.class);
        
        Unmarshaller unmarshaller = jc.createUnmarshaller();
        File xml = new File("input.xml");
        Foo foo = (Foo) unmarshaller.unmarshal(xml);
        
        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(foo, System.out);
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<foo>
   <Product>
      <Code>code</Code>
      <Desc>description</Desc>
   </Product>
</foo>

@XmlElement(name = ".")