[LDAP API 1.0.0-RC2] server side sorting control with DSMLv2

Fri, 27 Jan 2017 04:17:14 -0800 

Hi,
I have an application running in an OSGi container that uses the LDAP API and DSML parser and I would like to use the server side sorting control. 

When I send the following control...

        <ns2:control criticality="true" type="1.2.840.113556.1.4.473">

            <ns2:controlValue 
xmlns:xs="http://www.w3.org/2001/XMLSchema"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:type="xs:base64Binary">MAYwBAQCc24=</ns2:controlValue>

        </ns2:control>

...I get an error: "sorted results control value is absent".


2017-01-27 12:19:37,304 | DEBUG | NioProcessor-1   | 
CODEC_LOG                        | 94 - 
org.apache.directory.api.ldap.net.mina - 1.0.0.RC2 | Decoded LdapMessage 
: MessageType : SEARCH_RESULT_DONE

Message ID : 4
    Search Result Done
        Ldap Result
            Result code : (PROTOCOL_ERROR) protocolError
            Matched Dn : ''
            Diagnostic message : 'sorted results control value is absent'


I saw that an OpaqueControl is created for the sort control. Debugging I 
noticed that setEncodedValue is never called.



org.apache.directory.api.ldap.model.message.SearchRequestImpl@7ea4768c 
OpaqueControl Control

        Type OID    : '1.2.840.113556.1.4.473'
        Criticality : 'true'


Looking into this I came across the control factories registered on 
LdapApiService and saw that there are two implementations:

- DefaultLdapCodecService
- StandaloneLdapApiService


DefaultLdapCodecService is what is initialized in OSGi setup. I noticed 
that DefaultLdapCodecService unlike StandaloneLdapApiService does not 
register SortRequestFactory/SortResponseFactory. To try if this solves 
the issue I registered the two factories but then I get a 
ClassCastException:



Caused by: java.lang.ClassCastException: 
org.apache.directory.api.dsmlv2.DsmlControl cannot be cast to 
org.apache.directory.api.ldap.model.message.controls.SortRequest
    at 
org.apache.directory.api.ldap.codec.controls.sort.SortRequestFactory.newCodecControl(SortRequestFactory.java:35)[89:org.apache.directory.api.ldap.codec.core:1.0.0.RC2]
    at 
org.apache.directory.api.ldap.codec.osgi.DefaultLdapCodecService.newControl(DefaultLdapCodecService.java:253)
    at 
org.apache.directory.api.ldap.codec.api.MessageDecorator.addControl(MessageDecorator.java:329)[89:org.apache.directory.api.ldap.codec.core:1.0.0.RC2]
    at 
org.apache.directory.api.ldap.codec.decorators.SearchRequestDecorator.addControl(SearchRequestDecorator.java:1072)
    at 
org.apache.directory.api.ldap.codec.decorators.SearchRequestDecorator.addControl(SearchRequestDecorator.java:83)
    at 
org.apache.directory.api.ldap.codec.api.MessageDecorator.getDecorator(MessageDecorator.java:204)[89:org.apache.directory.api.ldap.codec.core:1.0.0.RC2]
    at 
org.apache.directory.api.ldap.codec.api.LdapEncoder.encodeMessage(LdapEncoder.java:159)[89:org.apache.directory.api.ldap.codec.core:1.0.0.RC2]
    at 
org.apache.directory.api.ldap.codec.protocol.mina.LdapProtocolEncoder.encode(LdapProtocolEncoder.java:81)
    at 
org.apache.mina.filter.codec.ProtocolCodecFilter.filterWrite(ProtocolCodecFilter.java:299)

    ... 58 more


I do not understand how the DSMLv2 parser works together with the LDAP 
codec and start to wonder if the server side sort control is even 
supposed to work at the moment.
- Is it possible that the parser for DSMLv2 does not support the server 
side sort control?
- Should SortRequestFactory/SortResponseFactory be registered or is 
there a reason why they are not registered on DefaultLdapCodecService 
per default?


I would appreciate any hints to get this working.

Cheers
Claudia























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