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https://issues.apache.org/jira/browse/DIRSERVER-1367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12710186#action_12710186
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Emmanuel Lecharny commented on DIRSERVER-1367:
----------------------------------------------

I think the server should respond with a NO_SUCH_ATTRIBUTE error isntead of a 
PROTOCOL_ERROR...

> Protocol error when requesting attribute with the space character only
> ----------------------------------------------------------------------
>
>                 Key: DIRSERVER-1367
>                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1367
>             Project: Directory ApacheDS
>          Issue Type: Bug
>          Components: ldap
>    Affects Versions: 1.5.4
>            Reporter: Stefan Seelmann
>             Fix For: 1.5.5
>
>
> When setting the returning attributes of a search to the space character the 
> server returns a protocol error:
> ldapsearch -H ldap://localhost:10389 -x -D "uid=admin,ou=system" -W -b 
> "ou=users,ou=system" -s base -a always "(objectClass=*)" " "
> The result is the following error:
> # extended result response
> extended: 1.3.6.1.4.1.1466.20036
> data:
> result: 2 Protocol error
> text: PROTOCOL_ERROR: The server will disconnect!
> Here is a testcase using JNDI:
> Index: 
> src/test/java/org/apache/directory/server/operations/search/SearchIT.java
> ===================================================================
> --- src/test/java/org/apache/directory/server/operations/search/SearchIT.java 
> (revision 774248)
> +++ src/test/java/org/apache/directory/server/operations/search/SearchIT.java 
> (working copy)
> @@ -1321,6 +1321,24 @@
>      
>      
>      /**
> +     * Check if no error occurs if " " is requested.
> +     */
> +    @Test
> +    public void testSearchUserAttributes_Space() throws Exception
> +    {
> +        LdapContext ctx = ( LdapContext ) getWiredContext( ldapService 
> ).lookup( BASE );
> +        SearchControls ctls = new SearchControls();
> +
> +        ctls.setSearchScope( SearchControls.OBJECT_SCOPE );
> +        ctls.setReturningAttributes( new String[]
> +            { " " } );
> +
> +        NamingEnumeration<SearchResult> result = ctx.search( HEATHER_RDN, 
> FILTER, ctls );
> +        result.close();
> +    }
> +
> +
> +    /**
>       * Check if user and operational attributes are present, if both "*" and 
> "+" are requested.
>       */
>      @Test

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