How to serialize a Map object from JAXB?

[Brendan cheng]

Hi,
I was trying to use this
@XmlElements({ @XmlElement(name = "sysFields", type = java.util.HashMap.class) })
Map<String,Object> sysFields;
to transfer sys fields from server to client side and instantiate the object bit failed.
Is there a way of doing this?
Cheers,
Brendan