jamod is an object oriented implementation of the Modbus protocol, realized 100% in Java. It allows to quickly realize master and slave applications in various transport flavors (IP and serial).
jamod is fast and stable
After years of waiting for Deiter to add more messages, I've forked a new project on SourceForge -- j2mod. I can't keep waiting for "jamod" to become a useful product. Sorry. I've started posting JARs and should have a complete Modbus implementation in a few weeks. The only untested message in j2mod is WRITE FILE RECORD, which jamod doesn't even have.