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RXTX - Full Java CommAPI implementation
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=======================================
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The rxtx-1.5 package contains a full implementation of the Java CommAPI from
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Sun. To use applications, written with the original CommAPI, with rxtx you have
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to change references to javax.comm.* to gnu.io.*.
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This package contains a full implementation of the Java CommAPI from Sun. To
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use applications, written with the original CommAPI, with rxtx you have to
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change references to javax.comm.* to gnu.io.*.
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The rest of this file contains some useful information about problems with the
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rxtx package found in the upstream INSTALL file. The unimportant sections are
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B. Exception in thread "main" java.lang.UnsatisfiedLinkError: no Serial in
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B. Exception in thread "main" java.lang.UnsatisfiedLinkError: no rxtxSerial in
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libSerial.so is located in the wrong directory. Here is an example
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$ mv /usr/local/java/jre/lib/i386/libSerial* /usr/local/lib
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Exception in thread "main" java.lang.UnsatisfiedLinkError: no Serial in
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at java.lang.ClassLoader.loadLibrary(Compiled Code)
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at java.lang.Runtime.loadLibrary0(Compiled Code)
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at java.lang.System.loadLibrary(Compiled Code)
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at gnu.io.NativePort.<clinit>(NativePort.java:32)
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at gnu.io.RXTXPort.<init>(Compiled Code)
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at gnu.io.RXTXCommDriver.getCommPort(Compiled Code)
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at gnu.io.CommPortIdentifier.open(Compiled Code)
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at SerialPortDisplay.openBBPort(Compiled Code)
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at SerialPortDisplay.<init>(Compiled Code)
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at BlackBox.addPort(Compiled Code)
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at BlackBox.main(Compiled Code)
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$ mv /usr/local/lib/libSerial.* /usr/local/java/jre/lib/i386/
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librxtxSerial.so is located in the wrong directory. Here is an example
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$ mv /usr/local/java/jre/lib/i386/librxtxSerial* /usr/local/lib
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Exception in thread "main" java.lang.UnsatisfiedLinkError: no rxtxSerial
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at java.lang.ClassLoader.loadLibrary(Compiled Code)
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at java.lang.Runtime.loadLibrary0(Compiled Code)
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at java.lang.System.loadLibrary(Compiled Code)
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at gnu.io.NativePort.<clinit>(NativePort.java:32)
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at gnu.io.RXTXPort.<init>(Compiled Code)
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at gnu.io.RXTXCommDriver.getCommPort(Compiled Code)
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at gnu.io.CommPortIdentifier.open(Compiled Code)
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at SerialPortDisplay.openBBPort(Compiled Code)
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at SerialPortDisplay.<init>(Compiled Code)
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at BlackBox.addPort(Compiled Code)
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at BlackBox.main(Compiled Code)
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Solution 1: move the file to a place that works
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$ mv /usr/local/lib/librxtxSerial.* /usr/local/java/jre/lib/i386/
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Solution 2: add the location of librxtxSerial to LD_LIBRARY_PATH
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$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/
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Solution 3: pass the location in on the command line
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$ java -Djava.library.path=/usr/local/lib/ ...
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C. I Can Not Open the Port.
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If you're not able to open the port (read the errors carefully) then you
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may not have permission to use the device. Redhat Linux ships with the
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following permissions:
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Users need to be able to read and write with serial communication...
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should fix the problem. Be sure to check the file CommAPI for common
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Make sure that the user can create lock files.
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If you're not able to open the port (read the errors carefully) then you
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may not have permission to use the device. Redhat Linux ships with the
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following permissions:
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Users need to be able to read and write with serial communication...
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should fix the problem. Be sure to check the file CommAPI for common
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Make sure that the user can create lock files.
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D. java.lang.NoClassDefFoundError: gnu/io/CommPort
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RXTXcomm.jar is probably not in your classpath or not located in
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for example, lets not include RXTXcomm.jar
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export CLASSPATH=../java/lib/classes.zip
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$ java BlackBoxException in thread "main"
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java.lang.NoClassDefFoundError: gnu/io/CommPort
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RXTXcomm.jar is probably not in your classpath or not located in
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for example, lets not include RXTXcomm.jar
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export CLASSPATH=../java/lib/classes.zip
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$ java BlackBoxException in thread "main"
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java.lang.NoClassDefFoundError: gnu/io/CommPort
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Until you do, "setserial -ga /dev/ttyS0" will always tell you
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the UART is unknown.
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More info is needed on signing applets. This is an exchange from the rxtx mail-
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prashantg10@yahoo.com asked:
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I am trying to use applet on thin terminal which has
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Linux base Kernel.For testing I am using Linux
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machine.I have install all the required components.
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e.g. JDK, RXTX. Everthing is fine. BlackBox runs ,even
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my application runs. When It comes to applet,
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everything is halts. It does not even show the listing
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of ports. Is it because applet can't run under root
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account or what might be the reasons. Can anybody tell
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Son To <son@openbx.net> replied:
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Java applets run withing the sandbox of the security manager.
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Applets must be signed to access the com port, but for development
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user_pref("signed.applets.codebase_principal_support", true);
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in your prefs.js located in ~/.mozilla/default/XYYrandomDirName
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I didn't use Java applet for my application. I used XUL and CSS for
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the GUI development and used mozilla Javascript SOAP library to
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communicate with apache Axis webservice backend which uses RXTX to
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