JAXB/Moxy @XmlPath(".") 在解组过程中与 XMLAdapter 发生冲突 [英] JAXB/Moxy @XmlPath(".") conflicts with the XMLAdapter during the unmarshalling

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问题描述

即使尝试了很多方法也无法找到解决方案，因此在此处发帖希望能找到一些解决方法或解决此问题.

基本上，如果 @XmlPath(".") 已在 Map 上使用，并且上面有 XMLAdapter然后它在 unmarshalling 期间失败.marshaling 完美运行，只有 unmarshalling 失败.

简而言之，我想执行解组 正如这里提到的，但与 Map 一起，我还有一个 @XmlElement.所以一个字段用 (Map field) @XmlPath(".") 注释，另一个 String 字段用 @XmlElement 注释，然后我想执行 解组.

以下是我试图解组的XML:

<客户 xmlns:google=https://google.com"><name>蝙蝠侠</name><age>2008</age><google:sub1>MyValue-1</google:sub1><google:sub2>MyValue-1</google:sub2></客户>

以下是将被解组的Customer.class:

@XmlRootElement(name = "Customer")@XmlType(name = "Customer", propOrder = {"name", "age", "userExtensions"})@XmlAccessorType(XmlAccessType.FIELD)@NoArgsConstructor@Getter@Setter@AllArgsConstructor公共类客户扩展人{私人字符串名称；私人字符串年龄；@XmlPath(".")@XmlJavaTypeAdapter(TestAdapter.class)@XmlAnyElement私有映射<字符串，对象>userExtensions = new HashMap<>();}

以下是将解组的Main类:

公共类解组{public static void main(String[] args)抛出 JAXBException、XMLStreamException、FactoryConfigurationError、IOException、URISyntaxException、ProcessingException {final InputStream inputStream = Unmarshalling.class.getClassLoader().getResourceAsStream(customer.xml");最终 XMLStreamReader xmlStreamReader = XMLInputFactory.newInstance().createXMLStreamReader(inputStream);最终 JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);最终解组器 unmarshaller = jaxbContext.createUnmarshaller();最终客户 customer = unmarshaller.unmarshal(xmlStreamReader, Customer.class).getValue();System.out.println("读取 XML :" + 客户);}}

当我运行这段代码时，我会得到如下输出:

读取 XML : Person(name=Rise against, age=2000)

它不会读取 custom 元素，例如 google:sub1 和 google:sub2.

  1. 还有一个与此类似的问题，但那里提到的解决方法对我不起作用.
  2. 我在 MAP 上尝试了 @XmlAnyElement(lax=true) 即使这对我不起作用.

以下是我用于 marshalling 和 unmarhsalling 的 TestAdapter Map

public class TestAdapter extends XmlAdapter>{@覆盖公共地图<字符串，对象>unmarshal(Wrapper value) 抛出异常 {System.out.println(适配器解组");System.out.println(value.getElements());如果(值 == 空){返回空；}//遍历ILMD标签内的所有元素最终映射<字符串，对象>extensions = new HashMap<>();for (Object obj : value.getElements()) {元素元素=(元素)obj;//System.out.println("节点名称:" + element.getNodeName() + "值:" + element.getTextContent());final NodeList children = element.getChildNodes();如果 (children.getLength() == 1) {extensions.put(element.getNodeName(), element.getTextContent());} 别的 {列表<对象>child = new ArrayList<>();for (int i = 0; i  v) 抛出异常 {如果(v == 空){返回空；}包装器包装器 = new Wrapper();列表元素 = new ArrayList();for (Map.Entry 属性 : v.entrySet()) {if (property.getValue() instanceof Map) {element.add(new JAXBElement(new QName(property.getKey()), Wrapper.class, marshal((Map) property.getValue())));} 别的 {element.add(new JAXBElement(new QName(property.getKey()), String.class, property.getValue().toString()));}}包装器元素 = 元素；返回包装器；}}类包装{@XmlAnyElement列表元素；公共列表 getElements() {返回元素；}

我尝试了很多东西，但到目前为止没有任何效果.有人可以看看这个问题并提供您的解决方案.很高兴提供有关此问题的更多信息，因为我花了将近 10 天的时间寻找答案.

我尝试了以下操作:

  1. 再创建一个变量并尝试仅在解组期间使用它，但也失败了.
  2. 尝试再创建一个字段，然后在其上使用 @XmlAnyElement 但这也没有按我预期的那样工作.

尝试了更多的东西，但没有任何帮助.

一切都失败了.我试图从 MOXY 调试代码，但我无法在那里跟踪很多东西.对此问题的任何帮助都会对我很有帮助.

解决方案

我能够通过使用 BeforeMarshal 和 AfterMarshal 方法获得它.在这里发帖，以便将来对某人有所帮助:

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY,visible = true, property = "isA")@JsonInclude(Include.NON_NULL)@JsonIgnoreProperties(ignoreUnknown = true)@XmlRootElement(name = "extension")@XmlType(name = "extension", propOrder = {"name", "age", "otherElements"})@XmlAccessorType(XmlAccessType.FIELD)@Getter@Setter@AllArgsConstructor@ToString@NoArgsConstructor公共类客户{@XmlTransient私有字符串 isA;@XmlPath("客户/姓名/文本()")私人字符串名称；@XmlPath("客户/年龄/文本()")私人字符串年龄；@XmlAnyElement(lax = true)@JsonIgnore@XmlPath(客户")私人列表<对象>otherElements = new ArrayList<>();@JsonIgnore@XmlTransient私有映射<字符串，对象>userExtensions = new HashMap<>();@JsonAnyGetter@JsonSerialize(使用 = CustomExtensionsSerializer.class)公共地图<字符串，对象>getUserExtensions() {返回用户扩展；}@JsonAnySetterpublic void setUserExtensions(String key, Object value) {userExtensions.put(key, value);}private void beforeMarshal(Marshaller m) 抛出 ParserConfigurationException {System.out.println("编组用户扩展前:" + userExtensions);ExtensionsModifier extensionsModifier = new ExtensionsModifier();otherElements = extensionsModifier.Marshalling(userExtensions);System.out.println("在编组最终其他元素之前" + otherElements);userExtensions = new HashMap<>();}private void afterUnmarshal(Unmarshaller m, Object parent) 抛出 ParserConfigurationException {System.out.println("解组后:" + otherElements);ExtensionsModifier extensionsModifier = new ExtensionsModifier();userExtensions = extensionsModifier.Unmarshalling(otherElements);System.out.println("最终用户扩展:" + userExtensions);其他元素 = 新的 ArrayList();}}

完整的答案可以在这里找到:https://stackoverflow.com/a/67923216/7584240>

Was unable to find the solution even after trying many things so posting here hoping to get some workaround or fix for this issue.

Basically, if the @XmlPath(".") has been used on a Map and if there is XMLAdapter on it then it fails during the unmarshalling. The marshaling works perfectly only the unmarshalling fails.

In short, I would like to perform the unmarshalling as mentioned here but along with Map I will have one more @XmlElement. So one field is annotated with (Map field) @XmlPath(".") and another String field with @XmlElement and then I would like to perform unmarshalling.

Following is the XML that I am trying to unmarshal:

<Customer xmlns:google="https://google.com">
  <name>Batman</name>
  <age>2008</age>
  <google:sub1>MyValue-1</google:sub1>
  <google:sub2>MyValue-1</google:sub2>
</Customer>

Following is the Customer.class to which it will be unmarshalled:

@XmlRootElement(name = "Customer")
@XmlType(name = "Customer", propOrder = {"name", "age", "userExtensions"})
@XmlAccessorType(XmlAccessType.FIELD)
@NoArgsConstructor
@Getter
@Setter
@AllArgsConstructor
public class Customer extends Person {

  private String name;
  private String age;

  @XmlPath(".")
  @XmlJavaTypeAdapter(TestAdapter.class)
  @XmlAnyElement
  private Map<String, Object> userExtensions = new HashMap<>();
}

Following is the Main class which will unmarshal:

public class Unmarshalling {
  public static void main(String[] args)
      throws JAXBException, XMLStreamException, FactoryConfigurationError, IOException, URISyntaxException, ProcessingException {
    final InputStream inputStream = Unmarshalling.class.getClassLoader().getResourceAsStream("customer.xml");
    final XMLStreamReader xmlStreamReader = XMLInputFactory.newInstance().createXMLStreamReader(inputStream);
    final JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);
    final Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
    final Customer customer = unmarshaller.unmarshal(xmlStreamReader, Customer.class).getValue();
    System.out.println("Read XML : " + customer);
  }
}

When I run this code I will get the output as:

Read XML : Person(name=Rise Against, age=2000)

Its not reading the custom elements such as google:sub1 and google:sub2.

  1. There is one more issue similar to this but the workaround mentioned there did not work for me.
  2. I tried the @XmlAnyElement(lax=true) on MAP even that did not work for me.

Following is the TestAdapter that I am using for marshalling and unmarhsalling the Map<String,Object>

public class TestAdapter extends XmlAdapter<Wrapper, Map<String, Object>> {

  @Override
  public Map<String, Object> unmarshal(Wrapper value) throws Exception {
    System.out.println("ADAPTER UNMARSHALLING");
    System.out.println(value.getElements());

    if (value == null) {
      return null;
    }

    //Loop across all elements within ILMD tag
    final Map<String, Object> extensions = new HashMap<>();
    for (Object obj : value.getElements()) {
      Element element = (Element) obj;

      //System.out.println("Node Name : " + element.getNodeName() + " Value : " + element.getTextContent());

      final NodeList children = element.getChildNodes();

      if (children.getLength() == 1) {
        extensions.put(element.getNodeName(), element.getTextContent());
      } else {
        List<Object> child = new ArrayList<>();
        for (int i = 0; i < children.getLength(); i++) {
          final Node n = children.item(i);
          if (n.getNodeType() == Node.ELEMENT_NODE) {
            Wrapper wrapper = new Wrapper();
            List childElements = new ArrayList();
            childElements.add(n);
            wrapper.elements = childElements;
            child.add(unmarshal(wrapper));
          }
        }
        extensions.put(element.getNodeName(), child);
      }
    }
    return extensions;
  }

  @SuppressWarnings("unchecked")
  @Override
  public Wrapper marshal(Map<String, Object> v) throws Exception {
    if (v == null) {
      return null;
    }

    Wrapper wrapper = new Wrapper();
    List elements = new ArrayList();
    for (Map.Entry<String, Object> property : v.entrySet()) {
      if (property.getValue() instanceof Map) {
        elements.add(new JAXBElement<Wrapper>(new QName(property.getKey()), Wrapper.class, marshal((Map) property.getValue())));
      } else {
        elements.add(new JAXBElement<String>(new QName(property.getKey()), String.class, property.getValue().toString()));
      }
    }
    wrapper.elements = elements;
    return wrapper;
  }
}

class Wrapper {

  @XmlAnyElement
  List elements;

  public List getElements() {
    return elements;
  }

I tried many things but nothing worked till now. Can someone please have a look at this issue and provide your solution. Happy to provide any more info with regards to this issue as I have spent nearly 10 days looking for answers.

I tried following things:

  1. Created one more variable and tried to use it only during unmarshalling but that's also failing.
  2. Tried to create one more field then used the @XmlAnyElement on it but that's also not working as I expected.

Tried few more things but nothing helped.

Everything is failing. I tried to debug the code from MOXY but I am unable to follow many things there. Any help with this issue would be really helpful for me.

解决方案

I was able to get it by using the BeforeMarshal and AfterMarshal methods. Posting here so it can be helpful to someone in the future:

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, visible = true, property = "isA")
@JsonInclude(Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
@XmlRootElement(name = "extension")
@XmlType(name = "extension", propOrder = {"name", "age", "otherElements"})
@XmlAccessorType(XmlAccessType.FIELD)
@Getter
@Setter
@AllArgsConstructor
@ToString
@NoArgsConstructor
public class Customer {
    @XmlTransient
    private String isA;

    @XmlPath("customer/name/text()")
    private String name;

    @XmlPath("customer/age/text()")
    private String age;

    @XmlAnyElement(lax = true)
    @JsonIgnore
    @XmlPath("customer")
    private List<Object> otherElements = new ArrayList<>();

    @JsonIgnore
    @XmlTransient
    private Map<String, Object> userExtensions = new HashMap<>();

    @JsonAnyGetter
    @JsonSerialize(using = CustomExtensionsSerializer.class)
    public Map<String, Object> getUserExtensions() {
        return userExtensions;
    }

    @JsonAnySetter
    public void setUserExtensions(String key, Object value) {
        userExtensions.put(key, value);
    }

    private void beforeMarshal(Marshaller m) throws ParserConfigurationException {
        System.out.println("Before Marshalling User Extension: " + userExtensions);
        ExtensionsModifier extensionsModifier = new ExtensionsModifier();
        otherElements = extensionsModifier.Marshalling(userExtensions);
        System.out.println("Before Marshalling Final Other Elements " + otherElements);
        userExtensions = new HashMap<>();
    }

    private void afterUnmarshal(Unmarshaller m, Object parent) throws ParserConfigurationException {
        System.out.println("After Unmarshalling : " + otherElements);
        ExtensionsModifier extensionsModifier = new ExtensionsModifier();
        userExtensions = extensionsModifier.Unmarshalling(otherElements);
        System.out.println("Final User Extensions : " + userExtensions);
        otherElements = new ArrayList();
    }
}

The complete answer can be found here: https://stackoverflow.com/a/67923216/7584240

这篇关于JAXB/Moxy @XmlPath(".") 在解组过程中与 XMLAdapter 发生冲突的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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