<bean id="contextSource" class="org.springframework.ldap.core.support.LdapContextSource">
          <property name="url" value="ldap://xxx.xx.xx.xx:xxx" />
          <property name="base" value="OU=Service,OU=Users,DC=com"/>
          <property name="userDn" value="user" />
          <property name="password" value="user" />
          <property name="cacheEnvironmentProperties" value ="false"/>
     </bean>

AndFilter filter = new AndFilter();
		        filter.and(new EqualsFilter("objectclass", "person")).and(new EqualsFilter("uid", logon));

		        if (ldapTemplate.authenticate(DistinguishedName.EMPTY_PATH, filter.toString(), password) != true || password == null)

11:40:44,108 ERROR LdapTemplate:1426 - Unable to find unique entry matching in authentication; base: ''; filter: '(&(objectclass=person)(uid=user))'. Found 0 matching entries