Jaxb, Class has two properties of the same name

Question

with jaxb, i try to read an xml file only a few element in xml file are interesting, so i would like to skip many element

xml content

xml i try to read

my class

@XmlRootElement(name="ModeleREP", namespace="urn:test:mod_rep.xsd")
public class ModeleREP {

  @XmlElement(name="TimeSeries")
  protected List timeSeries;

  public List getTimeSeries() {
  if (this.timeSeries == null) {
      this.timeSeries = new ArrayList();
  }
  return this.timeSeries;
  }

  public void setTimeSeries(List timeSeries) {
  this.timeSeries = timeSeries;
  }

}

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "TimeSeries")
public class TimeSeries {

@XmlElement(name="ResourceObject")
protected RessourceObject resourceObject;

@XmlElement(name = "Period")
protected Period period;

public RessourceObject getResourceObject() {
    return this.resourceObject;
}

public void setResourceObject(RessourceObject resourceObject) {
    this.resourceObject = resourceObject;
}

public Period getPeriod() {
    return this.period;
}

public void setPeriod(Period period) {
    this.period = period;
}

}

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "ResourceObject")

public class RessourceObject {
@XmlAttribute(name = "codingScheme")
protected String codingScheme;

@XmlAttribute(name = "v")
protected String v;

public String getCodingScheme() {
    return this.codingScheme;
}

public void setCodingScheme(String codingScheme) {
    this.codingScheme = codingScheme;
}

public String getV() {
    return this.v;
}

public void setV(String v) {
    this.v = v;
}
}

@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name = "Period")
public class Period {

@XmlElement(name = "TimeInterval")
protected TimeInterval timeInterval;

@XmlElement(name = "Pt")
protected List pt;

public TimeInterval getTimeInterval() {
    return this.timeInterval;
}

public void setTimeInterval(TimeInterval timeInterval) {
    this.timeInterval = timeInterval;
}

public List getPt() {
    if (this.pt == null) {
    this.pt = new ArrayList();
    }
    return this.pt;
}

public void setPt(List pt) {
    this.pt=pt;
}

}

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "TimeInterval")
public class TimeInterval {

@XmlAttribute(name = "v")
private String timeIntervalPeriod;

public String getTimeIntervalPeriod() {
    return this.timeIntervalPeriod;
}

public void setTimeIntervalPeriod(String timeIntervalPeriod) {
    this.timeIntervalPeriod = timeIntervalPeriod;
}

}

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "Pt")
public class Pt {

@XmlElement(name = "P")
protected P p;

@XmlElement(name = "A")
protected A a;

public P getP() {
    return this.p;
}

public void setP(P p) {
    this.p = p;
}

public A getA() {
    return this.a;
}

public void setA(A a) {
    this.a = a;
}
}

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "P")
public class P {
@XmlAttribute(name = "v")
protected String position;


public String getPosition(){
    return this.position;
}

public void setPosition(String position){
    this.position=position;
}
}

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "A")
public class A {
@XmlAttribute(name = "v")
protected String calculatedAmount;

public String getCalculatedAmount() {
    return this.calculatedAmount;
}

public void setCalculatedAmount(String calculatedAmount) {
    this.calculatedAmount = calculatedAmount;
}
}

when i try to read the xlm file i get i get

com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
Class has two properties of the same name "timeSeries"
    this problem is related to the following location:
        at public java.util.List testjaxp.ModeleREP.getTimeSeries()
        at testjaxp.ModeleREP
    this problem is related to the following location:
        at protected java.util.List testjaxp.ModeleREP.timeSeries
        at testjaxp.ModeleREP

i don't understand this error

edit: i use jaxb-impl-2.1.12

ok now i don't have any error, but when i check my object, timeSeries is null...

so maybe jaxb seem to have problem with flx?

user_3302747 · Answer

There are multiple solutions but basicly if you annotate on variable declaration then you need @XmlAccessorType(XmlAccessType.FIELD), but if you prefer to annotate either a get- or set-method then you don't.

So you can do:

@XmlRootElement(name="MY_CLASS_A")
@XmlAccessorType(XmlAccessType.FIELD)
public class MyClassA
{
    @XmlElement(name = "STATUS")   
    private int status;
   //.. and so on
}

Or:

@XmlRootElement(name="MY_CLASS_A")
public class MyClassA
{
    private int status;

    @XmlElement(name = "STATUS")         
    public int getStatus()
    {
    }
}

user_7477819 · Answer

ModeleREP#getTimeSeries() have to be with @Transient annotation. That would help.

user_4344238 · Answer

I did trial and error and got the conclusion that, you only have to use either of both @XMLElement or @XmlAccessorType(XmlAccessType.FIELD).

When to use which?

case 1 : If your field names and element name you want to use in xml file are different then you have to use @XMLElement(name="elementName"). As this will bind fields with that element name and display in XML file.

case 2 : If fields names and respective element name in xml both are same then you can simply use @XmlAccessorType(XmlAccessType.FIELD)

user_2160440 · Answer

Many solutions have been given, and the internals are briefly touched by @Sriram and @ptomli as well. I just want to add a few references to the source code to help understand what is happening under the hood.

By default (i.e. no extra annotations used at all except @XmlRootElement on the root class), JABX tries to marshal things exposed via two ways:

Notice that if a field is (or method returns) null, it will not be written into the output.

Now if @XmlElement is used, non-public things (could be fields or getter methods) can be marshalled as well.

But the two ways, i.e. fields and getter-methods, must not conflict with each other. Otherwise you get the exception.

Jaxb, Class has two properties of the same name

20 Answers