11g getting rolekey,userkey,objectkey

public Long getUserKey(String userLogin) {
Long userKey = null;
SearchCriteria criteria = new SearchCriteria("User Login", userLogin,SearchCriteria.Operator.EQUAL);
Set retAttrs = new HashSet();
retAttrs.add("usr_key");
UserManager usrMgr = client.getService(UserManager.class);
try {
usrMgr.search(criteria, retAttrs, null);
List users = usrMgr.search(
criteria, retAttrs, null);

userKey = (Long) users.get(0).getAttribute("usr_key");
} catch (Exception e) {
e.printStackTrace();
}
return userKey;
}

public long getObjectKey(String object) {
HashMap objectMap = new HashMap();
long key = 0;
try {
tcObjectOperationsIntf moObjectUtility = client.getService(tcObjectOperationsIntf.class);

objectMap.put("Objects.name", object);
tcResultSet moResultSet = moObjectUtility.findObjects(objectMap);

if (moResultSet.getRowCount() == 0) {
} else {
moResultSet.goToRow(0);
key = moResultSet.getLongValue("Objects.name");
}
} catch (Exception e) {
e.printStackTrace();
}
return key;
}


public String getRoleKey(String roleName)
{
String roleKey=null;
SearchCriteria criteria = new SearchCriteria(RoleAttributeName.NAME.getId(), roleName, SearchCriteria.Operator.EQUAL);
Set retAttrs = new HashSet();
retAttrs.add(RoleAttributeName.KEY.getId());
RoleManager roleMgr = (RoleManager)client.getService(RoleManager.class);
try {
List roles= roleMgr.search(criteria, retAttrs, null);
roleKey = roles.get(0).getAttribute(RoleAttributeName.KEY.getId()).toString();
} catch (Exception e) {
}
return roleKey;
}