Pro Micro Serial Communication

Projects Interfacing w/ Software on the Computer
1

Hello,
I am having trouble interfacing with the Sparkfun Pro Micro ("diskloader" bootloader). The problem seems a bit strange to me, because uploading and running programs works fine. Also sending data via the IDE's serial monitor is OK. But there is no way I can recieve data sent from the Arduino in the serial monitor. Baud rate ist set correctly. Using PuTTY instead of the serial monitor resolves this issue: sending and recieving work both.
I am trying to interface with the Pro Micro over a Java program, using the RXTX library (I think it's the same the IDE uses, isn't it?). With RXTX the same happens like in the IDE: I can only send data and recieving doesn't work. By the way, the TX led on the board only turns on when sending data to PuTTY. So, could it be a bug in RXTX?
Has anybody experienced anything similar? Help is highly appreciated!

Update: I think I should add I'm on 64-bit Windows 7, using the RXTX 2.2pre2 bins. The stable 2.1 doesn't have 64-bit support.
Another update: I've had the time to test it on a 32-bit machine (Windows XP SP3) and everything works! So there is a bug in the pre-release RXTX. Hope they fix it soon. Are there 64-bit alternatives to RXTX, or would I have to code my own in C/C++?

2

OK, finally solved it! I hope this can help others too, therefore I'm posting it here.
I simply used this: http://www.cloudhopper.com/opensource/rxtx/. It's a custom binary of RXTX that works perfectly fine on 64-bit, at least in my case.