Hi Jörg,
I found error in my code. Now I can skip fields which are new. It is ok.
Can I write skipped fields into log file, if I use override wrapMapper?
Best Regards
Petr
Hi Jörg,
thanks for answer.
Dne 20.9.2014 v 22:46 Jörg Schaible napsal(a):
Hi Petr,
Petr Adamec wrote:
Good morning,
I have a problem with convert from xml to data (unmarshall) when I use
xml which has unknown tags. Xstream write me Exception in thread "main"
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException:
No such field.
This is the expected behavior.
Ok. I understand.
In the general case it is ok. I know if I serialize one class and
deserialize to other class (or the same but older), it is a problem.
My case is that I serialize newer class and deserialize to the older
(class). I know that it is non-standard situation.
I was looking for solution for my problem on internet. I find some it
but all of them do not working on my case.
I override method wrapMapper but it still no working.
XStream xstream = new XStream() {
// to enable ignoring of unknown elements
@Override
protected MapperWrapper wrapMapper(MapperWrapper next) {
return new MapperWrapper(next) {
@Override
public boolean shouldSerializeMember(Class
definedIn,
String fieldName) {
if (definedIn == Object.class) {
try {
return this.realClass(fieldName)
!= null;
} catch (Exception e) {
return false;
}
}
return super.shouldSerializeMember(definedIn,
fieldName);
}
};
}
};
Which version of XStream are you using?
I use version 1.4.7.
Is it maybe because I have a collection at class. But every options
which I try not works.
My class which I need convert to/from is
public class Configurations implements Serializable{
private static final long serialVersionUID =
4392719277296957995L;
private List<Class<? extends Updatable>> tableNames;
private Map<Class<? extends Updatable>, List<? extends
Updatable>>
tables;
...
}
Updatable is only interface. I need convert to/from xml every class
which implements this interface.
In normal case, when I has right xml (get from marshell data) it is ok.
I can convert data to this xml and xml back to data.
<mypackage.Configurations>
<tableNames>
<java-class>mypackage.configuration.MyClass</java-class>
</tableNames>
<tables>
<entry>
<java-class>mypackage.configuration.MyClass</java-class>
<list>
<mypackage.configuration.MyClass>
<id>0</id>
<created>2014-09-19 08:49:34.649 UTC</created>
<active>true</active>
</mypackage.configuration.MyClass>
</list>
</entry>
</tables>
</mypackage.Configurations>
But when I change xml (forr example add new tag newTag)
<mypackage.Configurations>
<tableNames>
<java-class>mypackage.configuration.MyClass</java-class>
</tableNames>
<tables>
<entry>
<java-class>mypackage.configuration.MyClass</java-class>
<list>
<mypackage.configuration.MyClass>
<id>0</id>
<created>2014-09-19 08:49:34.649 UTC</created>
<active>true</active>
<newTag>exam</newTag>
</mypackage.configuration.MyClass>
</list>
</entry>
</tables>
</mypackage.Configurations>
Xstream ends with error
AbstractReflectionConverter$UnknownFieldException: No such field. Is
exists solution how can I solve this problem? I need convert to data
(class) and if xml has unknown tags which does not exist at class, logg
some message and skip tag.
Ok. I read faq.
I understand from
http://xstream.codehaus.org/faq.html#Serialization_newer_class_versions that
If I have a new version class which has one or more fields newer that
when I serialize it to xml and deserialize it to older version where
new fields is missing, field will be uninitialized. It is ok. But in
this case (the first case from
http://xstream.codehaus.org/faq.html#Serialization_newer_class_versions )
no exception should be throwed, if i undestand right.
See
http://xstream.codehaus.org/faq.html#Serialization_newer_class_versions
The topics also direct you to the proper location of the custom
mapper from
above.
Cheers,
Jörg
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Best Regards
Petr
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