I\'ve got a big problem with IBM HACL for accessing a server which speaks 3270 protocol. The library keeps crashing, and our JNI wrapper is actually a bug-fixing layer for the p
I am unfamiliar with the differences between 3270 and 5250 data streams, but there is a 5250 implementation in Java in the tn5250j project available from http://tn5250j.sourceforge.net/
It might be usable for you?
(also there is a 3270 screen scraping project at http://freehost3270.sourceforge.net/ but it appears to be abandoned).