使用Moxy在复杂类型元素上获取Null值JAXB

问题描述：

这是我想要解组的XML（我没有XSD）。我必须解开它才能得到一个名称和Id的数组。所以，名字生成得很好，但问题在于Id。 Id的设置为空。任何人都可以帮助我找出问题吗？使用Moxy在复杂类型元素上获取Null值JAXB

<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" expressionLanguage="http://www.w3.org/1999/XPath" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn" typeLanguage="http://www.w3.org/2001/XMLSchema"> 
    <bpmn:collaboration id="Collaboration_0b6zt1k" isClosed="false"> 
    <bpmn:participant id="Participant_113vq9r" processRef="CallActivity_00qe833" /> 
    </bpmn:collaboration> 
    <bpmn:process id="CallActivity_00qe833" isClosed="false" isExecutable="true" name="Some Text" processType="None"> 
    <bpmn:serviceTask activiti:class="Assign PC" completionQuantity="1" id="ServiceTask_0ip6tj7" implementation="##WebService" isForCompensation="false" name="Some Text 1" startQuantity="1"> 
     <bpmn:extensionElements> 
     <activiti:properties> 
      <activiti:property name="specKey" value="ServiceTask_0ip6tj7" /> 
     </activiti:properties> 
     </bpmn:extensionElements> 
     <bpmn:incoming>SequenceFlow_0sa9y9o</bpmn:incoming> 
     <bpmn:outgoing>SequenceFlow_1bd3qmp</bpmn:outgoing> 
    </bpmn:serviceTask> 
    <bpmn:serviceTask activiti:class="generateURL" completionQuantity="1" id="ServiceTask_11t11da" implementation="##WebService" isForCompensation="false" name="Some Text 2" startQuantity="1"> 
     <bpmn:extensionElements> 
     <activiti:properties> 
      <activiti:property name="specKey" value="ServiceTask_11t11da" /> 
     </activiti:properties> 
     </bpmn:extensionElements> 
     <bpmn:incoming>SequenceFlow_1bd3qmp</bpmn:incoming> 
     <bpmn:outgoing>SequenceFlow_0cynzzs</bpmn:outgoing> 
    </bpmn:serviceTask> 
    <bpmn:serviceTask activiti:class="generateURL" completionQuantity="1" id="ServiceTask_11t11da" implementation="##WebService" isForCompensation="false" name="Some Text 3" startQuantity="1"> 
     <bpmn:extensionElements> 
     <activiti:properties> 
      <activiti:property name="specKey" value="ServiceTask_11t11da" /> 
     </activiti:properties> 
     </bpmn:extensionElements> 
     <bpmn:incoming>SequenceFlow_1bd3qmp</bpmn:incoming> 
     <bpmn:outgoing>SequenceFlow_0cynzzs</bpmn:outgoing> 
    </bpmn:serviceTask> 
    </bpmn:process> 
</bpmn:definitions>

这是我的JAXB注解类：

package XMLToObject; 

    import java.util.List; 
    import javax.xml.bind.annotation.XmlAccessType; 
    import javax.xml.bind.annotation.XmlAccessorType; 
    import javax.xml.bind.annotation.XmlAttribute; 
    import javax.xml.bind.annotation.XmlRootElement; 
    import org.eclipse.persistence.oxm.annotations.XmlPath; 

    @XmlRootElement 
    @XmlAccessorType(XmlAccessType.FIELD) 
    public class definitions { 

     @XmlPath("bpmn:process/bpmn:serviceTask/@name") 
     @XmlAttribute 
     List<String> name; 

     @XmlPath("bpmn:process/bpmn:serviceTask/@id") 
     @XmlAttribute 
     List<String> id; 

     @XmlAttribute 
     String typeLanguage; 

     public List<String> getname() { 

      return name; 
     } 

     public List<String> getid() { 

      return id; 
     } 

     public String gettypeLanguage() { 
      return typeLanguage; 
     } 
    }

这是我的Java类：

package XMLToObject; 

/* 
* To change this license header, choose License Headers in Project Properties. 
* To change this template file, choose Tools | Templates 
* and open the template in the editor. 
*/ 

/** 
* 
* @author Gauravb 
*/ 
import java.io.File; 
import java.util.Collection; 
import java.util.List; 
import javax.xml.bind.JAXBContext; 
import javax.xml.bind.JAXBException; 
import javax.xml.bind.Unmarshaller; 

public class XMLToObject { 
public static void main(String[] args) { 
    try {  
      File file = new File("employee.xml");  
      JAXBContext jaxbContext = JAXBContext.newInstance(definitions.class);  
      System.out.println("JAXB....."+jaxbContext.toString()); 
      Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();  
      definitions p = (definitions) jaxbUnmarshaller.unmarshal(file); 
      System.out.println("Task Name:"+p.getname()); 
      System.out.println("Svc ID:"+p.getid()); 
      System.out.println("Type Language:"+p.gettypeLanguage()); 
      } catch (JAXBException e) {e.printStackTrace(); }  

} 
}

现在，这是我得到的输出：

run: 
[email protected] 
Task Name:[Some Text 1, Some Text 2, Some Text 3] 
Svc ID:null 
Type Language:http://www.w3.org/2001/XMLSchema 
BUILD SUCCESSFUL (total time: 0 seconds)

我的问题是，为什么我得到Svc ID为“n üll“当同样的工作任务名称。

请注意： 1.我使用莫西为JAXB 2.请注意，当我更改顺序，然后名字越来越设置为空：

@XmlPath("bpmn:process/bpmn:serviceTask/@id") 
@XmlAttribute 
List<String> id; 


@XmlPath("bpmn:process/bpmn:serviceTask/@name") 
@XmlAttribute 
List<String> name;

我得到这样的输出：

run: 
[email protected] 
Task Name:null 
Svc ID:[ServiceTask_0ip6tj7, ServiceTask_11t11da, ServiceTask_11t11da] 
Type Language:http://www.w3.org/2001/XMLSchema 
BUILD SUCCESSFUL (total time: 0 seconds)

答

貌似mulltiple属性上莫西不支持（真可惜:(刚开始我爱莫西）

附是链接

With MOXy and XPath, is it possible to unmarshal two lists of attributes?

使用Moxy在复杂类型元素上获取Null值JAXB

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