JAXB unmarshalling issues when elements have namespaces

Question

This code only works if I remove "bpmn:" from all the elements inside the XML file, otherwise it throws the following exception:

javax.xml.bind.UnmarshalException: unexpected Element (URI:"http://www.omg.org/spec/BPMN/20100524/MODEL", local:"definitions"). Expected elements are <{}definitions> .

Im trying to make it work without modifying the XML file. Any help would be greatly appreciated. Thanks in advance :)



  
    
      Flow_06i118e
    
    
      Flow_06i118e
      Flow_0linmbs
    
    
    
      Flow_0linmbs
      Flow_0yu7ggy
    
    
      Flow_0yu7ggy

@XmlRootElement
public class Definitions {

 private String id;
 private Process process;



    public Definitions(){};
    public Definitions(String id, Process process){
        this.id = id;
        this.process = process;
    }

    @XmlAttribute
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    @XmlElement(namespace = "bpmn",name = "process")
    public Process getProcess() {
        return process;
    }

    public void setProcess(Process process) {
        this.process = process;
    }
}

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.getId());

        } catch (JAXBException e) {
            e.printStackTrace();
        }

    }
}

Thomas Fritsch · Accepted Answer

You need to specify the XML namespace URIs in your @XmlRootelement and @XmlElement annotations, not the XML namespace prefixes ("bpmn" or "bpmndi").

So then your Definitions class would look like this:

@XmlRootElement(namespace = "http://www.omg.org/spec/BPMN/20100524/MODEL")
public class Definitions {

    private String id;
    private Process process;
    private BPMNDiagram bpmnDiagram;

    public Definitions(){};
    public Definitions(String id, Process process, BPMNDiagram bpmnDiagram){
        this.id = id;
        this.process = process;
        this.bpmnDiagram = bpmnDiagram;
    }

    @XmlAttribute
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    @XmlElement(namespace = "http://www.omg.org/spec/BPMN/20100524/MODEL", name = "process")
    public Process getProcess() {
        return process;
    }

    public void setProcess(Process process) {
        this.process = process;
    }

    @XmlElement(namespace = "http://www.omg.org/spec/BPMN/20100524/DI", name = "BPMNDiagram")
    public BPMNDiagram getBpmnDiagram() {
        return bpmnDiagram;
    }

    public void setBpmnDiagram(BPMNDiagram bpmnDiagram) {
        this.bpmnDiagram = bpmnDiagram;
    }   
}

In a similar way you need to modify the @XmlElement annotations in your other classes (Process, BPMNDiagram, ...).

JAXB unmarshalling issues when elements have namespaces

Answers (1)

Related Questions