PDMLink : change the author of a document

I write sample java code, for change creator attribute, you can test them from eclipse

package wt.vc;

import wt.doc.WTDocument;
import wt.fc.Persistable;
import wt.fc.PersistenceHelper;
import wt.fc.ReferenceFactory;
import wt.fc.WTReference;
import wt.org.WTPrincipalReference;
import wt.util.WTException;

/**
 * @author Feofilov Ivan created: 02.03.2011 fivig@mail.ru
 * http://plmservice.ru
 * 
 */
public class CreatorModifier {

 public static void main(String[] args) {
 // document must be checkout
 WTDocument doc = (WTDocument) getObjectByRefString("VR:wt.doc.WTDocument:16168148");
 wt.org.WTUser p = (wt.org.WTUser) getObjectByRefString("OR:wt.org.WTUser:4287687");

 assignIterationCreator(doc, (WTPrincipalReference) getRefObjByObj(p));
 try {
 PersistenceHelper.manager.save(doc);
 } catch (WTException e) {
 e.printStackTrace();
 }

 }

 public static Iterated assignIterationCreator(Iterated iterated,
 WTPrincipalReference wtprincipalreference)

 {

 try {
 iterated.getIterationInfo().setCreator(wtprincipalreference);
 } catch (Exception e) {
 e.printStackTrace();
 }
 return null;
 }

 public static Persistable getObjectByRefString(String refString) {
 Persistable result = null;
 try {
 ReferenceFactory refFact = new wt.fc.ReferenceFactory();
 WTReference ref = refFact.getReference(refString);
 result = ref.getObject();
 } catch (WTException e) {
 e.printStackTrace();
 }
 return result;
 }

 public static WTReference getRefObjByObj(Persistable obj) {
 try {

 ReferenceFactory refFact = new wt.fc.ReferenceFactory();
 return refFact.getReference(obj);
 } catch (WTException e) {
 e.printStackTrace();
 return null;
 }
 }

}