jConnect has supported LDAP connectivity since version 4.0. As a result, the recommended approach, which requires no custom software, is to configure DataSources as LDAP entries using the LDAP Data Interchange Format (LDIF).
For example:
dn:servername:myASE, o=MyCompany, c=US
1.3.6.1.4.1.897.4.2.5:TCP#1# mymachine 4000
1.3.6.1.4.1.897.4.2.10:PACKETSIZE=1024&user=me&password=secret
1.3.6.1.4.1.897.4.2.11:userdb