---------- Forwarded Mail ----------
Subject: ConverterLookup
Date: 24th December 2013, 13:02:09
From: Alvaro <alv...@pwntester.com>
To: joerg.schai...@gmx.de
Hi Joerg,
Im trying to write to the xstream dev list but get bounced by the mailing
daemon even though Im subscribed. Maybe you can help me with this problem
since you are one of the developers of the ConverterLookup class.
Im trying to register the folloging ConverterLookup:
import com.thoughtworks.xstream.converters.ConversionException;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.ConverterLookup;
import com.thoughtworks.xstream.converters.basic.NullConverter;
public class MyConverterLookup implements ConverterLookup {
private final Converter nullConverter = new NullConverter();
public Converter lookupConverterForType(Class type) throws
ConversionException {
if (type == null) {
return nullConverter;
}
if (type.equals(Contact.class)) {
return new ContactConverter();
} else {
throw new ConversionException("No converter specified for " +
type);
}
}
}
But Im getting the following exception:
Exception in thread "main"
org.springframework.oxm.UncategorizedMappingException: Unknown XStream
exception; nested exception is
com.thoughtworks.xstream.InitializationException: Could not instantiate
mapper : com.thoughtworks.xstream.mapper.AnnotationMapper : argument type
mismatch
at
org.springframework.oxm.xstream.XStreamMarshaller.convertXStreamException(XStreamMarshaller.java:807)
at
org.springframework.oxm.xstream.XStreamMarshaller.doMarshal(XStreamMarshaller.java:689)
at
org.springframework.oxm.xstream.XStreamMarshaller.marshalWriter(XStreamMarshaller.java:676)
at
org.springframework.oxm.xstream.XStreamMarshaller.marshalWriter(XStreamMarshaller.java:666)
at
org.springframework.oxm.support.AbstractMarshaller.marshalStreamResult(AbstractMarshaller.java:272)
at
org.springframework.oxm.support.AbstractMarshaller.marshal(AbstractMarshaller.java:103)
at org.pwntester.xstreamoxm.Main.main(Main.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: com.thoughtworks.xstream.InitializationException: Could not
instantiate mapper : com.thoughtworks.xstream.mapper.AnnotationMapper :
argument type mismatch
at
com.thoughtworks.xstream.XStream.buildMapperDynamically(XStream.java:604)
at com.thoughtworks.xstream.XStream.buildMapper(XStream.java:586)
at com.thoughtworks.xstream.XStream.<init>(XStream.java:552)
at com.thoughtworks.xstream.XStream.<init>(XStream.java:514)
at
org.springframework.oxm.xstream.XStreamMarshaller$1.<init>(XStreamMarshaller.java:388)
at
org.springframework.oxm.xstream.XStreamMarshaller.constructXStream(XStreamMarshaller.java:387)
at
org.springframework.oxm.xstream.XStreamMarshaller.buildXStream(XStreamMarshaller.java:372)
at
org.springframework.oxm.xstream.XStreamMarshaller.getXStream(XStreamMarshaller.java:584)
at
org.springframework.oxm.xstream.XStreamMarshaller.doMarshal(XStreamMarshaller.java:686)
... 10 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at
com.thoughtworks.xstream.XStream.buildMapperDynamically(XStream.java:602)
... 18 more
Im using the following code to set up the converterlookup
XStreamMarshaller xstream = new XStreamMarshaller();
xstream.setConverterLookup(new MyConverterLookup());
Any idea why is failing? Im trying to use the lookup class as an elegant
solution for the remote code execution problem when using the reflection
converters. So I just want to use the Contact converter or fail.
I already implemented the other solution you proposed:
- register a ContactConverter
- register a CatchAllConverter with low priority
That approach works but I found the lookup class and it seems a more
elegant solution
Thanks,
A
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