When using spring-ldap - if you get a NoClassDefFoundError for com.sun.jndi.ldap.ctl.ResponseControlFactory then you need the ldap booster pack (currently 1.0).
This is available from Sun:
http://java.sun.com/products/jndi/downloads/index.html
Go to the JNDI 1.2.1 page and grab JNDI/LDAP Booster Pack 1.0 (ldapbp-1_0.zip)
Unzip and then install as an artifact:
