Tomcat 8 is currently not supported in BMA 8.7. BMA 8.8 is currently going through the final release processe and I know that Tomcat 8 is not supported in BMA 8.8 as well.
There is already an IDEA in for this feature enhancement.
Product Management will review it and scope it. You can track it from the IDEA link above.
If you are satisfied, could you please mark this thread as "answered".