With latest jssc-2.9.6.jar, renamed into jssc.jar, now the AStream_Error event gives the error (under Linux):
Error: (SerialPortException) jssc.SerialPortException: Port name - /dev/ttyUSB0; Method name - getInputBufferBytesCount; Exception type - Native exception occurred: IO input/output error.
Under Windows always were and is OK.
Troubles were under Linux only - crash at USB-COM plugging, the system non-catchable error was at some Linux (at another PC - it was OK).
No idea why.
Now with the latest .jar - no those error (as in the first post of the thread) at all, no crash!
And now the catchable error in AStream_Error is OK to workaround.