Oracle/Sun dropped support for the original JavaComm API years ago, making it hard to find official downloads.
While it was once a stable and flexible solution for Java-to-hardware communication, javax.comm should be avoided for new projects . It is extremely difficult to set up on modern systems, and superior, actively maintained libraries are readily available. Package Javax Comm
The de facto standard replacement for many years was RXTX (e.g., org.rxtx:rxtxcomm ), but it is also considered old. Modern Java serial communication is typically handled via modern, maintained libraries like jSerialComm or jSSC (Java Simple Serial Connector). Oracle/Sun dropped support for the original JavaComm API
Uses a Java event model to detect changes in signal lines (e.g., carrier detect). Review & Status (As of 2026) Package Javax Comm