Replacing an existing attribute with an attribute with no values lead to an 
(illegal) attribute with empty value
----------------------------------------------------------------------------------------------------------------

                 Key: DIRSERVER-701
                 URL: http://issues.apache.org/jira/browse/DIRSERVER-701
             Project: Directory ApacheDS
          Issue Type: Bug
    Affects Versions: 1.0-RC4
         Environment: * ApacheDS 1.0 RC4 SNAPSHOT
* Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-b03)
* Windows XP Professional SP2
            Reporter: Stefan Zoerner


If someone tries to replace an existing attribute with an attribute with no 
values (modify op), it is expected that the attribute is removed. In Apache DS 
(curent 1.0 branch), this is not the case. 

The attached test case creates an inetOrgPerson entry and tries to remove the 
givenname attribute with the following lines:

...
// replace attribute givenName with empty value (=> deletion)
Attribute attr = new BasicAttribute("givenname");
ModificationItem item = new ModificationItem(DirContext.REPLACE_ATTRIBUTE, 
attr);
ctx.modifyAttributes(rdn, new ModificationItem[] { item });
...

The operation does not cause an error, but afterwards the givenname attribute 
is still present in the entry (although it does not have any value). It is 
expected that the attribute givenname does not exist anymore within the entry.

The attached test case demonstrates the situation and passes on the following 
servers:
    * Sun Java System Directory Server 5.2
    * OpenLDAP 2.3
    * IBM Tivoli Directory Server 6.0
On Apache Directory Server 1.0 RC4 SNAPSHOT, it fails.
 

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