Re: betwixt files doesn't work with inherited Interfaces

[robert burrell donkin]

hi andrew
i'm a little intrigued by this problem and i'll take a look at adding a 
solution but i'm not likely to be able to have anything ready tonight. 
just to check i've parsed you correctly, you're using a normalizer and 
the introspection needs to pick up the methods on the super-interfaces 
for the given interface, right?

(unfortunately, you'll have to roll your own jar since it'll be too 
late to go into the upcoming 0.6 release.)

- robert
On 5 Aug 2004, at 16:26, Gray, Andrew (ITDA) wrote:
Hi,
After some digging I've hit a "limitation" - ultimately due (IMHO) to
java.beans.Introspector - if you introspect an interface you don't get
deatils on anything defined in super interfaces  (I'm using jdk 
1.4.2.02)

All of my javaBean structures are defined by interfaces with the
implementation classes being context specific.
public interface Person {
    String getName();
    void setName(String name);
}
public interface Developer extends Person {
    int getHackCount();
    void setHackCount(int hacks);
    Pet getPet();
    void setPet(Pet pet);}
public interface Pet {
   ...
}
public interface DevTeam {
    Collection getDevelopers();
    void addDeveloper(Developer dev);
}
add some .betwixt files telling the parser what mplementations to use
DevTeam.betwixt: -
...
<element name='developer' property='developers' class='MyDeveloper'/>
...
and Developer.betwixt: -
...
<element name='pet' property='pet' class='teh super-interfaceMyPet'/>
<addDefaults>
...
etc.
Now I come to unmarshall the following snippet in a xml doc.
...
<devTeam>
   <developer>
      <name>Joe Blo</name>
      <hackCount>32</hackCount>
      <pet> ... </pet>
  </developer>
</devTeam>
...
Trying to get betwixt to parse a Developer is failing as the 
Introspection
API is not telling it about the name property defined in Person.

Defining specific elements is no better. There is no WriteMethod 
returned
from the introspector so no Digester rule is created to parse "name" 
and it
ends up null.

Thoughts appreciated.
Will DynaBeans get round this?
Does anyone know if Sun will "fix" the introspector?
Is there a preferred workaround / approach if they won't (soon)?
(I don't want to redifine things in subclasses already in superclasses)
regards
Andy Gray

Department for Environment, Food and Rural Affairs (Defra)
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