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Java Library for serial communication with Officine Robotiche Boards
From: Arduino Page
If you installed the Arduino IDE, you already have the RXTX library installed for the next steps, and you may be able to skip this section and start with the sample Java code. If you installed a separate copy of the RXTX, you can do one of the following:
When starting Java, use the -Djava.library.path= command line argument to state where the JNI libraries are located. For example, you could use:
java -Djava.library.path=C:\rxtx-2.2pre2-bins\win32 SerialTest
You should also ensure that the RXTXcomm.jar is in your CLASSPATH.
Copy the win32/rxtxSerial.dll into C:\Windows\System32 Append the directory containing rxtxSerial.dll into your PATH environment variable.
Copy the win64/rxtxSerial.dll into C:\Windows\SysWOW64 Append the directory containing rxtxSerial.dll into your PATH environment variable.
Download the last version of the rxtx java library at http://rxtx.qbang.org/wiki/index.php/Download. Extract the package, open extracted files, go to Linux and choose the folder which correspond to your system configuration. Copy all the files from the previous folder to /jre/lib/[machine type] (i386 for instance). Copy RXTXcomm.jar from the main folder to /jre/lib/ext.
Copy RXTXcomm.jar from the main folder to /Library/Java/Extensions Copy the mac-10.5/librxtxSerial.jnilib (or, if this version does not work for you, obtain a 64 bit compiled version from http://blog.iharder.net/2009/08/18/rxtx-java-6-and-librxtxserial-jnilib-on-intel-mac-os-x/) and paste into /Library/Java/Extensions Append the directory containing librxtxSerial.jnilib files into your DYLD_LIBRARY_PATH environment variable See the other notes on Mac OS X below the sample java code.