Hi, I got the same error messages.
I tried some minimal code using librxtx-java got the same messages. Please check if I'm correct. import java.util.*; import gnu.io.*; public class Test1 { public Test1() { Enumeration ports = CommPortIdentifier.getPortIdentifiers(); } public static void main (String args[]) { Test1 myTest1 = new Test1(); } } And save it as Test1.java $ CLASSPATH=/usr/share/java/RXTXcomm.jar javac Test1.java $ CLASSPATH=/usr/share/java/RXTXcomm.jar:. java Test1 java.lang.NullPointerException thrown while loading gnu.io.RXTXCommDriver java.lang.NullPointerException thrown while loading gnu.io.RXTXCommDriver So it seems to me that there are some problems in librxtx-java ? Yours, Paul -- PaulLiu (劉穎駿) E-mail: Ying-Chun Liu (PaulLiu) <paul...@debian.org>
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