How to deal with OrganizationalUnit with Spring LDAP 2.0 ODM?

Question

I'm migrating our LDAP client application that manages our OpenLDAP objects. This application is written in Java and currently use spring ldap 1.3. I'm currently (70%) in the process of migrating to spring ldap 2.0.2 and I'm quite happy with this new version.

I've created our objects and used annotations (@Entry ...) and it works.

Now here is my problem :

• My users are in ou=people,dc=mycompany,dc=com
• The user belongs to an unit
• base name for units is ou=units,dc=mycompany,dc=com
• Units are hierarchically embedded : ou=a,ou=b,ou=units or ou=e,ou=b,ou=units

Here is my code:

@Entry(objectClasses={"organizationalUnit", "top"}, base="ou=units")
public class Unit {

    @Id
    private Name dn;

    @Attribute(name="ou")
    @DnAttribute(value="ou", index=1)
    private String rdn;
}

But this code only works for first level units ! I've found the following question and @marthursson suggests to write its own ObjectDirectoryMapper. Is this the only solution ?

Edit 1 : You mean, like :

@Entry(objectClasses={"organizationalUnit", "top"}, base="ou=units")
public class Unit {

    @Id
    private Name dn;

    @Attribute(name="ou")
    @DnAttribute(value="ou", index=1)
    private String rdn;

    @Attribute(name="ou")
    @DnAttribute(value="ou", index=2)
    private String lvl2;

    @Attribute(name="ou")
    @DnAttribute(value="ou", index=3)
    private String lvl3;

    @Attribute(name="ou")
    @DnAttribute(value="ou", index=4)
    private String lvl4;
}

I get one IndexOutofBoundException if there is no value to put at index 2. Typically when I'm loading the root unit under ou=units.

Edit 2 : The following function does the job :

public String getRdn() {
    LdapName n = LdapNameBuilder.newInstance(dn.getSuffix(dn.size()-1)).build();
    return n.getRdn(0).getValue().toString();
}