In the xplanner.properties file there is a default value for debug like so: (line 170ish)

#xplanner.security.login[1].option.debug=true

This is misleading as debug is actually an integer value when it's copied over to the JNDIAuthenticatorImpl class and it fails trying to convert from a string "true" to an integer. In fact, it fails silently which brings up another issue.

In com/sabre/security/jndi/JNDIAuthenticatorImpl.java around line 280, the function setOptions(), it catches an exception but does not print a stack trace or anything so it is silent and was therefore really hard to find out why the above issue was happening.

I suggest printing a stacktrace there like so:

catch (Exception e) {
 e.printStackTrace();
}