DataNucleus supports persistence to heterogeneous datastores and this plugin provides persistence to LDAP.
'org.datanucleus:datanucleus-ldap:2.1.0-m2'
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-ldap</artifactId>
<version>2.1.0-m2</version>
</dependency>
<dependency org="org.datanucleus" name="datanucleus-ldap" rev="2.1.0-m2"/>
"org.datanucleus", "datanucleus-ldap", "2.1.0-m2"