API Java-Arduino

Hi

I need to establish a communication between my Raspberry 3 and Arduino Uno.
I Use the RXTX Library. I can send message to my Raspberry from Arduino but I don't how to do the opposite.

It's possible? How ?

There also the Ardulink Library. Which one should I use ?

pardon my English.
Ty

the_apprentice:
I can send message to my Raspberry from Arduino but I don't how to do the opposite.

Sounds a bit like a Raspberry Pi/Java question to me. You can also use Python to interface with Arduinos easily (using the PySerial package).

This simple Python - Arduino demo should give you the general idea about the PC-Arduino communication. You should be able to replace the Python code with equivalent functionality in any other programming language.

...R