I tried using the settings from your post, but am now getting the following message:
Error encountered
[ART.118.5042] Adapter Runtime (Connection): Unable to enable connection resource TrainingBJH:testIfxJDBC.
[ART.118.5036] Adapter Runtime (Connection): Unable to configure connection manager.
com.informix.jdbc.IfxDriver
I think for the Informix version I am using (2.21 type 4), I need to use the source class com.informix.jdbcx.ifxdatasource.
I do have the informix jar files in both IS/lib/jars and in IS/packages/WmJDBCAdapter/code/jars/static. One problem might be that I have all the jars that are in the install folder from the driver installation, and maybe there is some conflict there. I notice that the only jar file that contains reference to Apache (see error above) are in xerces.jar (which I am removing to try).