I been using XStream with great results for a number of tasks, but now I run
into a problem that seems to boil down to the order in which the XStream object
is configured.
I've made a simplified example:
<doc>
<intro>
<link>
<url>/foo/bar</url>
</link>
</intro>
<link>
<url>/up/down</url>
<image>cat.jpg</image>
</link>
</doc>
The setup is like:
XStream xstream = new XStream();
xstream.alias("doc", DocText.class);
xstream.addImplicitCollection(DocText.class, "links");
xstream.alias("intro", Paragraph.class);
xstream.alias("link", UrlLink.class); // 1
xstream.alias("link", ImageLink.class); // 2
The gist of the classes:
public class DocText {
private Paragraph intro;
private List<ImageLink> links;
}
public class Paragraph {
UrlLink link;
}
public class UrlLink {
String url;
}
public class ImageLink {
private String url;
private String image;
}
When the sequence of the lines marked 1 & 2 is as shown it works. When they
change place it throws the following exception:
No such field com.codedroids.oc.schema.dao.UrlLink.image
---- Debugging information ----
field : image
class : com.codedroids.oc.schema.dao.UrlLink
required-type : com.codedroids.oc.schema.dao.UrlLink
converter-type :
com.thoughtworks.xstream.converters.reflection.ReflectionConverter
path : /doc/link/image
line number : 9
class[1] : com.codedroids.oc.schema.dao.DocText
version : null
-------------------------------
If DocText has a simple field called link rather than a list of them, then it
works either way (after removing the xstream.addImplicitCollection() of
course).
The problem is that I am trying to get the xstream configuration generated
automatically from the related schema definition and thus cannot be sure in
which order the various alias'es gets invoked.
I haven't tried using annotations since there places where the same class is
mapped by more than one tag name - this works fine with alias'es but with
annotation I can only map it to one tag name (or perhaps I'm mistaken)
Thanks
Claus
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