Re: [Simple-support] Deserilize objects with inheritance

[Niall G. <gal...@ya...>]

add the @Attribute(name="id") to the constructor in B

--- On Mon, 6/8/12, Nhat Ngo <phu...@gm...> wrote:


From: Nhat Ngo <phu...@gm...>
Subject: [Simple-support] Deserilize objects with inheritance
To: sim...@li...
Received: Monday, 6 August, 2012, 7:27 PM




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.


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