Re: [Simple-support] Deserilize objects with inheritance

[Simon B. <sim...@if...>]

You need to remove the @Root annotation from class B.Nhat Ngo <phu...@gm...> hat geschrieben:Hi everyone,

I'm a student, new to SimpleXML library. Per the title suggested, I am having a huge problem deserializing a stored inherited object using Java SimpleXML library. Let's say my codes are:

@Root(name="a")

public class A {
   @Attribute(name="id")

   protected int id;

   public A(@Attribute(name="id") int id){

       this.id = id;
   }

}

@Root(name="b")

public class B extends A {

   @Element(name="key",type=int.class)

   private int key;

   public B(int id,

            @Element(name="key",type=int.class) int key) {

       super(id);
       this.key = key;

   }
}

public class Main {

   public static void Main() {

       File src = new File("example.xml");

       Serializer serializer = new Persister();

       //Serialize the object
       B b = new B(1,1);

       serializer.write(b, src);

       //Error here, deserialize the object
       B b2 = serializer.read(B.class, src);

   }
}
There is no error and the Serializer happily serializes the object b to:

<b id="1">
    <key>1</key>

</b>
Now when I attempt to deserialize it, the program throws:

org.simpleframework.xml.core.PersistenceException: Constructor not matched for class B
How should I annotate both class A and B to behave correctly? I've tried put in  @Attribute(name="id") in B constructor to no avail and the serializer failed to serialize anything.

Thanks.