Java Mule XStream XML到对象

我有这种xml格式，必须通过Mule xml转换为对象组件。使用xStream

<server session="1234" time="2014-01-01T00:00:00">
    <getbalance id="101" guid="X9HK3G898NYML5B5" />
</server>

mule-xml

...
<mulexml:xml-to-object-transformer doc:name="XML to Object">
    <mulexml:alias name="server" class="ps.Server"/>
</mulexml:xml-to-object-transformer>
...

---

如何从根节点获取session=“1234”time=“2014-01-01T00:00:00”

public class Server {
    @JacksonXmlProperty(isAttribute = true)
    private String session;
    @JacksonXmlProperty(isAttribute = true)
    private Date time;
    // getters and setters
}

希望能有帮助

Server [session=null, time=null]

public class Server {
    @JacksonXmlProperty(isAttribute = true)
    private String session;
    @JacksonXmlProperty(isAttribute = true)
    private Date time;
    // getters and setters
}