Jörg Schaible <Joerg.Schaible@...> writes:
>
> Hi,
>
> Zdenko wrote:
>
> >
> > Hi Jörg,
> > To clarify problem. Inner class deserialized using XStream is not
> > initialized correctly. When I try to access outer class by referencing it:
> > Outer.this
> > I got null reference exception.
> > While debugging I realized that instance of Inner class has this$1 pointer
> > of type Outer and it has value null.
> > What should I do to get correctly initialized Inner class? (I have to
> > access the instance of Outer class)
>
> When you marshal your object into XML, XStream will also marshal the 'outer'
> instance and therefore restore both at unmarshalling. So how does your
> object look like, how the XML representation and how do you configure the
> XStream?
>
> - Jörg
>
I have XML which I do not control. XStream is used only for deserialization. I
created simplified version of code I have, along with test.
public class TestXmlDeserialization {
/*
<Outer UserId="SomeID">
<Inner Name="InnerName">
</Inner>
</Outer>
*/
@XStreamAlias("Outer")
class Outer {
@XStreamAlias("Inner") //Not needed, same happens when removed.
class Inner {
@XStreamAlias("Name")
@XStreamAsAttribute
String name;
void doIt() {
System.out.println(Outer.this);
System.out.println(Outer.this.userId);
}
}
@XStreamAlias("UserId")
@XStreamAsAttribute
String userId;
@XStreamAlias("Inner")
Inner inner;
}
public static void main(String[] args) {
File fXmlFile = new File("c:\\temp\\inner.xml");
try {
XStream xstream = new XStream(new StaxDriver());
xstream.processAnnotations(new Class[] {Outer.class});
Object pojo = xstream.fromXML(fXmlFile);
if(pojo instanceof Outer) {
Outer ou = (Outer) pojo;
ou.inner.doIt();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
Output:
null
java.lang.NullPointerException
at TestXmlDeserialization$Outer$Inner.doIt(TestXmlDeserialization.java:144)
at TestXmlDeserialization.main(TestXmlDeserialization.java:164)
I created Inner as inner class (not static inner) since I have to access
instance of outer.
>From Inner class read attribute UserId of Outer class.
Zdenko
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