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Index › Programming Questions & Help › Programs › Serial problems (RXTX mismatch) Mac 0090
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Serial problems (RXTX mismatch) Mac 0090 (Read 1929 times)
mellis
Serial problems (RXTX mismatch) Mac 0090
May 18th, 2005, 12:24pm  
I'm having problems using the serial library in Processing 0090 on the Mac (0S X 10.3.9).  When I try to play my applet (code below), I get the following error:

WARNING:  RXTX Version mismatch
Jar version = RXTX-2.0-4
native lib Version = RXTX-2.1-7pre17

java.lang.ClassCastException thrown while loading gnu.io.RXTXCommDriver
java.lang.ClassCastException thrown while loading gnu.io.RXTXCommDriver

java.lang.UnsatisfiedLinkError: Native Library /Applications/processing-0090/libraries/serial/library/librxtxSerial.jnilib already loaded in another classloader

Any idea what might cause this?

I do have some old version of Processing on my machine (0068, 0085, 0089), but I can't seem to find any versions of RXTXSerial.jar in my /System/... or in my sketchbook.  Any ideas where I should be looking?  How does one determine the version of a jar or jnilib?

I also noticed that /Applica
tions/processing-0090/libraries/serial/library/RXTXcomm.jar appears twice in the command line for the playing of the sketch.  Could that be a problem?

The applet source is:

import processing.serial.*;

void setup()
{
 println(Serial.list());
}
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mellis
Re: Serial problems (RXTX mismatch) Mac 0090
Reply #1 - May 18th, 2005, 6:19pm  
I figured out the problem.  I did have an old version of RXTX installed on my machine and didn't know it.

Some places to look:

/Library/Java/Extensions
/System/Library/Java/Extensions
/System/Library/Frameworks/JavaVM.framework/Home/lib/ext

The file may may RXTXcomm.jar or simply comm.jar.  libSerial.jnilib, jcl.jar, and javax.comm.properties may also cause problems.
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fry
Re: Serial problems (RXTX mismatch) Mac 0090
Reply #2 - May 18th, 2005, 8:35pm  
k, added a note about this to the faq.
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