MOXy XPath unmarshalling Element adalah null
Saya mencoba untuk membatalkan camunda: elemen properti ke dalam Daftar menggunakan XPath untuk melewati elemen pembungkus yang tidak perlu. Sayangnya propertyList saya selalu nol. Ini terletak di Kelas Tugas. Bantuan apa pun akan sangat dihargai.
Sunting # 1: Saya mengikuti tautan berikut yang seharusnya membantu masalah saya sayangnya tidak berhasil. http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.htmlyang merupakan panduan resmi. Ternyata ada beberapa tantangan dengan file maven pom.xml. Saya menduga bahwa masalahnya terletak di dalam file pom. Saya mengikuti panduan inihttps://www.javacodegeeks.com/2012/07/eclipselink-moxy-as-jaxb-provider.html tapi tetap tidak berhasil.
file pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>BPMN-Marshaller</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<repositories><repository>
<id>EclipseLink Repo</id>
<url>http://download.eclipse.org/rt/eclipselink/maven.repo</url>
<name>EclipseLink Repo</name>
</repository></repositories>
<dependencies>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.moxy</artifactId>
<version>3.0.0-M1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.3</version>
</dependency>
<!-- Runtime, com.sun.xml.bind module -->
<dependency>
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>2.3.2</version>
</dependency>
<dependency>
<groupId>jakarta.xml.bind</groupId>
<artifactId>jakarta.xml.bind-api</artifactId>
<version>2.3.2</version>
</dependency>
</dependencies>
</project>
jaxb.properties file dalam paket dan folder yang sama dengan kelas java saya (lihat gambar terlampir dengan nama "Struktur Proyek")
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
package-info.java file
@XmlSchema(namespace="http://www.omg.org/spec/BPMN/20100524/MODEL", elementFormDefault=XmlNsForm.QUALIFIED, xmlns = {@XmlNs(prefix="bpmn", namespaceURI="http://www.omg.org/spec/BPMN/20100524/MODEL")
,@XmlNs(prefix = "camunda", namespaceURI = "http://camunda.org/schema/1.0/bpmn")})
package bpmn;
import javax.xml.bind.annotation.*;
potongan file xml
<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:camunda="http://camunda.org/schema/1.0/bpmn" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" id="Definitions_13d3a6z" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="4.1.1">
<bpmn:process id="Process_1tovjba" isExecutable="true">
<bpmn:startEvent id="StartEvent_1">
<bpmn:outgoing>Flow_06i118e</bpmn:outgoing>
</bpmn:startEvent>
<bpmn:task id="Activity_1d3friu" name="Task 1">
<bpmn:extensionElements>
<camunda:properties>
<camunda:property name="start_date" value="01-04-2018" />
<camunda:property name="duration" value="5" />
</camunda:properties>
</bpmn:extensionElements>
<bpmn:incoming>Flow_06i118e</bpmn:incoming>
<bpmn:outgoing>Flow_0linmbs</bpmn:outgoing>
</bpmn:task>
Kelas Definisi
@XmlRootElement
public class Definitions {
private String id;
private Process process;
public Definitions(){};
public Definitions(String id, Process process){
super();
this.id = id;
this.process = process;
}
@XmlAttribute
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@XmlElement
public Process getProcess() {
return process;
}
public void setProcess(Process process) {
this.process = process;
}
@Override
public String toString(){
return "Definitions [id23=" + id + ", process=23499999999999999" + process + "]";
}
}
Kelas Proses
public class Process {
private String id;
private List<Task> taskList;
private List<SequenceFlow> sequenceFlowList;
public Process(){};
public Process(String id, List<Task> taskList, List<SequenceFlow> sequenceFlowList){
super();
this.id = id;
this.taskList = taskList;
this.sequenceFlowList = sequenceFlowList;
}
@XmlAttribute
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@XmlElement(name = "task")
public List<Task> getTaskList() {
return taskList;
}
public void setTaskList(List<Task> taskList) {
this.taskList = taskList;
}
@XmlElement(name = "sequenceFlow")
public List<SequenceFlow> getSequenceFlowList() {
return sequenceFlowList;
}
public void setSequenceFlowList(List<SequenceFlow> sequenceFlowList) {
this.sequenceFlowList = sequenceFlowList;
}
}
Kelas Tugas
public class Task {
private String id;
private String name;
private List<Property> propertyList;
public Task(){}
public Task(String id, String name, List<Property> propertyList){
super();
this.id = id;
this.name = name;
this.propertyList = propertyList;
}
@XmlAttribute
@JsonProperty("text")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@XmlAttribute
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@XmlElement(name = "property")
@XmlPath("bpmn:extensionElements/camunda:properties/camunda:property")
public List<Property> getPropertyList() {
return propertyList;
}
public void setPropertyList(List<Property> propertyList) {
this.propertyList = propertyList;
}
}
Kelas Properti
public class Property {
private String name;
private String value;
public Property(){}
public Property(String name, String value) {
super();
this.name = name;
this.value = value;
}
@XmlAttribute
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@XmlAttribute
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
Kelas Utama
public class XMLToObject {
public static void main(String[] args) {
try {
File file = new File("process.bpmn");
JAXBContext jaxbContext = JAXBContext.newInstance(Definitions.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
Definitions definitions = (Definitions) jaxbUnmarshaller.unmarshal(file);
System.out.println(definitions.getProcess().getTaskList().get(0).getPropertyList());
} catch (JAXBException e) {
e.printStackTrace();
}
}
}
Struktur Proyek
Jawaban
Saya membuat perubahan berikut pada pendekatan Anda, dan saya bisa mengakses data properti duration
dan start_date
dari file XML Anda.
Saya menggunakan OpenJDK 14, omong-omong. Tapi pendekatan ini juga berjalan OK menggunakan versi 8.
POM yang saya gunakan memiliki dependensi berikut:
<dependency>
<groupId>com.sun.activation</groupId>
<artifactId>javax.activation</artifactId>
<version>1.2.0</version>
</dependency>
<!--
Use 2.3.1 below to prevent "illegal
reflective access operation" warnings.
-->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-core</artifactId>
<version>2.3.0.1</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.7.6</version>
</dependency>
(Saya melewatkan ketergantungan Jackson hanya untuk tes ini.)
Saya juga menambahkan bagian berikut di akhir POM saya, untuk menangani file properti:
<!-- to copy the jaxb.properties file to its class package: -->
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
</build>
Ini memastikan file properti diterapkan ke lokasi yang benar dengan file kelas terkait.
Saya menambahkan kode untuk memeriksa penyedia JAXB mana yang digunakan - hanya sebagai konfirmasi positif:
private void checkProvider() throws JAXBException {
JAXBContext jc = JAXBContext.newInstance(Definitions.class);
String jaxbContextImpl = jc.getClass().getName();
if(MOXY_JAXB_CONTEXT.equals(jaxbContextImpl)) {
System.out.println("EclipseLink MOXy");
} else if(METRO_JAXB_CONTEXT.equals(jaxbContextImpl)) {
System.out.println("Metro");
} else {
System.out.println("Other");
}
}
Saya memodifikasi kode untuk mengulang melalui data properti, untuk secara eksplisit mencetak nilai properti akhir:
List<Property> props = definitions.getProcess().getTaskList().get(0).getPropertyList();
props.forEach(prop -> {
System.out.println(prop.getName() + " - " + prop.getValue());
});
//System.out.println(definitions.getProcess().getTaskList().get(0).getPropertyList());
Output yang dihasilkan adalah:
EclipseLink MOXy
start_date - 01-04-2018
duration - 5