"Calculated UME LDAP id is null" error received during runtime.

Question

Hello All,
I am new to this community and this is my first post.
Therefore please pardon me for providing inadequate explanation/resources while mentioning my problem.
I am trying to build a SOAP webservice in SAP NetWeaver Developer Studio 7.3. This webservice will be used for integration between SAP user management  (AS Java)  with Dell's Quest Identity Management (Q1IM).
The webservice will be used for
Fetching
-> All UME Users
-> All UME Groups
-> All UME Roles
Add/Delete
-> User to/from Group
-> User to/from Role
Change
-> User Account Details
The current scenario is the webservice built in Java is ready and all the functional components are working fine during runtime except for one and that is when I try to retrieve all the UME Users.
Below mentioned piece of code is for getAllUser function
    public  SAPUser[] getAllUsers() throws UMException {
    IUserFactory userFactory = UMFactory.getUserFactory();
    IUserSearchFilter searchFilter = userFactory.getUserSearchFilter();
    searchFilter.setDisplayName("*", ISearchAttribute.LIKE_OPERATOR, false);
    ISearchResult searchResult = userFactory.searchUsers(searchFilter);
    ArrayList<SAPUser> ar = new ArrayList<SAPUser>();   
    while (searchResult.hasNext())
    String uniqueid = searchResult.next().toString();
    if (uniqueid.startsWith("USER.PRIVATE_DATASOURCE.un"))
        IUser user = userFactory.getUser(uniqueid);
        IUserAccount[] userAcc = user.getUserAccounts();
        for (int i = 0; i<userAcc.length;i++)
        ar.add(new SAPUser(userAcc[i]));
    SAPUser[] users = new SAPUser[ar.size()];
  return ar.toArray(users); 
Similar logic have been used for Groups and Roles and they are working fine.
During runtime it gives following error
Web service returned error. Fault Code: "(http://schemas.xmlsoap.org/soap/envelope/)Server" Fault String: "Calculated UME LDAP id is null"
(Screenshot has also been attached)
I tried searching for a solution on internet and specially on SAP SCN but couldn't come across any suitable option.
Thereby my request to member-experts of this forum to please look into my matter mentioned above and provide some appropriate solution for it.
Thanks in advance.
Regards,
Tanuj Jaitly

Answer 1

Hi Soumya,
Thanks for the valuable suggestion.
Now I have another situation and this I would like to share with you and other experts in this forum.
Apart from above scenario I was trying to fetch all the LDAP users as well, but due to large number of employees in my organization I received Connection Time Out. We thus changed our requirement.
We now want to display those LDAP users which have UME roles and groups associated with their accounts. In other words LDAP users who can login to SAP Java portal to access their roles and groups.
From UME API as getLastSuccessfulLogonDate()  and getPreviousSuccessfulLogonDate() are already deprecated I am unable to find any concrete solution.
Request to please help. Thanks in advance.
Tanuj Jaitly