Welcome to the forums! Blacktie is an implementation of the X/Open ATMI API much the same as Tuxedo.
In this way, if you have Tuxedo services (written in C) which adhere to the XATMI interface (don't worry, most do!) then these should deploy just fine into blacktie.
In terms of Jolt, this is BEA's own API and as such we don't have the same level of portability that the C side does. However we do have two Java APIs that you could take a look at: JAB and EJB Connector. I think it sounds like the JAB API could help you out here. You can find the javadocs at:
Looking forward to hearing more from you in the future,