Detect using non-native jt400.jar when on AS/400?

[Thorbjørn Ravn Andersen <thunderaxiom@xxxxxxxxx>]

Hi.

I am developing web applications on my PC and deploying them to 
AS/400's, which requires that I use the jtopen version of jt400.jar on 
the PC and the native jt400.jar on the iSeries, as only the latter seems 
to support the *CURRENT, *CURRENT default login values.

This is not a problem as such, except that I occasionally forget to 
remove jt400.jar from my WAR file before deploying, which then gives 
login failures.

I'd like to know if there is a programmatic way I can see if I'm using 
the opensource version of jtopen, and a way to determine definitively if 
I'm running on an AS/400, so I can deliberately check for this in my code?

We are using version jtopen 5.0 internally.

Best regards,