I am trying to use the 64 bit rxtx serial communication library (downloaded from cloudhopper) with 64bit windows 7 and eclipse. I get the message:
java.lang.Unsatisfi
I had the same problem. So I installed JDK 32-bit and added those RxTx files(x86) to Program files(x86)/java/... folder instead of Program files/java... folder. Also I added those RxTx .dll files(x86) to /System32 folder. After that the problem was resolved in my application.