When running wsprovide with -keep option (ie. generating and keeping the artifacts sources), we currently do not support generics in wrapper classes.
So for a SEI like this:
@WebService(targetNamespace = "http://foo.bar.com/calculator")
public class CalculatorBean
{
@WebMethod
public Set<Integer> getKeys(HashMap<Integer, String> map)

{ if (map != null) return map.keySet(); else return null; }

}

we get the following wrapper
@XmlRootElement(name = "getKeys", namespace = "http://foo.bar.com/calculator")
@XmlType(name = "getKeys", namespace = "http://foo.bar.com/calculator")
@XmlAccessorType(XmlAccessType.FIELD)
public class GetKeys {

@XmlElement(name = "arg0", namespace = "")
private HashMap arg0;

public HashMap getArg0()

{ return this.arg0; }

public void setArg0(HashMap arg0) { this.arg0 = arg0; }

}

instead of

@XmlRootElement(name = "getKeys", namespace = "http://foo.bar.com/calculator")
@XmlType(name = "getKeys", namespace = "http://foo.bar.com/calculator")
@XmlAccessorType(XmlAccessType.FIELD)
public class GetKeys {

@XmlElement(name = "arg0", namespace = "")
private HashMap<Integer, String> arg0;

public HashMap<Integer, String> getArg0() { return this.arg0; }

public void setArg0(HashMap<Integer, String> arg0)

{ this.arg0 = arg0; }

}