XStream fail on trivial xml

[zinfinal]

I have very simple xml file:testSimple2.txt\[code\]<root> <document> </document></root>\[/code\]But for some reason I can't deserialize it with XStream.Root.java\[code\]@XStreamAlias("root")public class Root { @XStreamAlias("document") static public class Document { } @XStreamAlias("document") Document document;}\[/code\]Main.javaMain code:\[code\]XStream xstream = new XStream();xstream.autodetectAnnotations(true);xstream.processAnnotations(Root.class);Root newJoe = (Root) xstream.fromXML(new File("testSimple2.txt"), Root.class); //Exception here\[/code\]The following exception is thrown.\[code\]com.thoughtworks.xstream.converters.ConversionException: Element document of type verySimple.Root$Document is not defined as field in type java.lang.Class---- Debugging information ----class : verySimple.Rootrequired-type : verySimple.Rootconverter-type : com.thoughtworks.xstream.converters.reflection.ReflectionConverterpath : /root/documentline number : 3version : null------------------------------- at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.writeValueToImplicitCollection(AbstractReflectionConverter.java:403) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:334) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134) at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1058) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1042) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1006) at verySimple.RootProcess.main(RootProcess.java:26)\[/code\]I know there must be some simple mistake, but I can't see it. Please, help.