Cannot retrieve Members of Group

Question

Hi ,
I am new to Active Directory. I have the following code to retrieve members of a group (in Active Directory) which does not work.
InitialLdapContext ctx = null;
String[] MY_ATTRS = attr.split(",");
SearchControls constraints = new SearchControls();
constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);
constraints.setReturningAttributes(MY_ATTRS);
ctx.search("DC=nam,DC=corp,DC=mg,DC=com", "(memberOf=OU=Moved IDs,OU=People,OU=Common,OU=ME,OU=BP,OU=USA,DC=nam,DC=corp,DC=mg,DC=com)", constraints);
(does not work)
However, we have another group as follows and it works.
CN=NAMMEMovedIDs,OU=SG,OU=Process,OU=Common,OU=ME,OU=BP,OU=USA,DC=nam,DC=corp,DC=mg,DC=com
ctx.search("DC=nam,DC=corp,DC=mg,DC=com", "(memberOf=CN=NAMMEMovedIDs,OU=SG,OU=Process,OU=Common,OU=ME,OU=BP,OU=USA,DC=nam,DC=corp,DC=mg,DC=com)", constraints);
(works)
I am not sure what is the difference between OU and CN groups ? Why am I not able to retrieve members of OU ? Any ideas please.
Thanks

Answer 1

I was able to retrieve Members of Group using the following code.
SearchControls constraints = new SearchControls();
constraints.setSearchScope (SearchControls.SUBTREE_SCOPE);
NamingEnumeration results = ctx.list("OU=ME,OU=BP,OU=USA,DC=nam,DC=corp,DC=mg,DC=com");
// List users
while (results.hasMore())
NameClassPair ncp = (NameClassPair) results.next();
String userName = ncp.getName();
System.out.println("User: "+userName);
}