我需要用XStream解析JSON，其中一个类有一个JSONObject字段，XStream应该直接将JSON转储到它中。但是，XStream（当前使用1.4.1）尝试解析该JSON并因UnknownFieldException而失败。这是孤立的代码：
class Container {
public JSonObject data = null;
}
public class TestXStreamJson {
public String testRequest = "{\"container\":{\"data\":{\"FirstName\":\"John\",\"LastName\":\"Doe\"}}}";
@Test
public void test() throws Exception {
XStream xs = new XStream(new JettisonMappedXmlDriver());
xs.setMode(XStream.NO_REFERENCES);
xs.alias("container", Container.class);
Object x = xs.fromXML(testRequest);
System.out.println(x);
}
}
XStream的结果堆栈跟踪：
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException: No such field org.json.JSONObject.FirstName
---- Debugging information ----
field : FirstName
class : org.json.JSONObject
required-type : org.json.JSONObject
converter-type : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
line number : -1
class[1] : com.genesyslab.brs.api.Container
version : null
-------------------------------
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.determineType(AbstractReflectionConverter.java:449)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:290)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:230)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:351)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:302)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:230)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
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:1035)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1019)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:895)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:886)