Web services 在webservices/jaxb中使用具有集合的用户定义类

我有一个模型班-

@XmlRootElement(name = "providerData")
public class ProviderData implements java.io.Serializable{

    private static final long serialVersionUID = 1L;

    private int id;
    private String firstname;
    private String lastname;
    private Map<String, String> customerMap = new HashMap<String, String>();
    private List<DriverDataMap> driverDataMapList;

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请建议一些方法来整理/取消整理包含用户定义的类引用的数据模型。

哪个类是异常抱怨？@BlaiseDoughan its DriverDataMap。

public class DriverDataMap implements Serializable{

    private static final long serialVersionUID = 1L;

    private Map<String,String> driverFieldMap;
    private int key;
    private Map<String,String> drivingHistoryFieldMap;

faultString: java.io.IOException: No serializer found for class