Java 17 - Issue with Custom JAXB Unmarshaller for Nested XML Structures
I'm sure I'm missing something obvious here, but I'm currently working on a project that requires unmarshalling a complex XML document into Java objects using JAXB. The XML structure includes nested elements, and I'm facing an issue where the nested objects are not being properly populated in my Java classes. The XML looks like this: ```xml <root> <parent> <child> <name>Child 1</name> </child> <child> <name>Child 2</name> </child> </parent> </root> ``` I've defined the corresponding Java classes as follows: ```java import javax.xml.bind.annotation.*; import java.util.List; @XmlRootElement(name = "root") public class Root { private Parent parent; @XmlElement(name = "parent") public Parent getParent() { return parent; } public void setParent(Parent parent) { this.parent = parent; } } @XmlAccessorType(XmlAccessType.FIELD) class Parent { @XmlElement(name = "child") private List<Child> children; public List<Child> getChildren() { return children; } public void setChildren(List<Child> children) { this.children = children; } } @XmlAccessorType(XmlAccessType.FIELD) class Child { private String name; @XmlElement(name = "name") public String getName() { return name; } public void setName(String name) { this.name = name; } } ``` When I try to unmarshal the XML using this code: ```java import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Unmarshaller; public class Main { public static void main(String[] args) { try { JAXBContext jaxbContext = JAXBContext.newInstance(Root.class); Unmarshaller unmarshaller = jaxbContext.createUnmarshaller(); Root root = (Root) unmarshaller.unmarshal(new File("path/to/xml/file.xml")); System.out.println(root.getParent().getChildren().size()); } catch (JAXBException e) { e.printStackTrace(); } } } ``` I get an empty list for `children`, which indicates that the unmarshalling process is not recognizing the nested elements correctly. In particular, I'm puzzled why the `children` field is not being populated as expected. I've tried annotations like `@XmlElementWrapper` as well, but that didn't seem to help. Could someone point out what might be going wrong or suggest an alternative approach to handle nested elements with JAXB in Java 17? I'm working on a application that needs to handle this. What's the best practice here? I'd really appreciate any guidance on this. The project is a CLI tool built with Java. Cheers for any assistance!