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HowTo.SetupJavaToUseUSBSerial History

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February 15, 2008, at 10:55 AM by aimevareillewanadoofr -- Compiling and running the Test with debian
Changed lines 107-108 from:

/usr/bin/jikes -classpath /usr/share/jamvm/classes.zip:/usr/share/classpath/glibj.zip:RXTXcomm?.jar Test.java


/usr/bin/jikes -classpath /usr/share/jamvm/classes.zip:/usr/share/classpath/glibj.zip:RXTXcomm.jar Test.java

Changed lines 115-116 from:

/usr/bin/jamvm -Djava.library.path=/usr/lib/classpath/ -classpath .:RXTXcomm?.jar Test


/usr/bin/jamvm -Djava.library.path=/usr/lib/classpath/ -classpath .:RXTXcomm.jar Test

February 15, 2008, at 10:53 AM by aimevareillewanadoofr -- Compiling and running the Test with debian
Added line 106:
Added line 114:
February 15, 2008, at 10:52 AM by aimevareillewanadoofr -- Compiling and running the Test with debian
Added lines 105-107:

The same with debian : /usr/bin/jikes -classpath /usr/share/jamvm/classes.zip:/usr/share/classpath/glibj.zip:RXTXcomm?.jar Test.java

Added lines 112-114:

Again with debian giving exactly the same result : /usr/bin/jamvm -Djava.library.path=/usr/lib/classpath/ -classpath .:RXTXcomm?.jar Test

February 15, 2008, at 09:32 AM by aimevareillewanadoofr -- addendum for java USBSerial on debian for NSLU2
Added lines 76-78:

For Debian on NSLU2 (see http://www.nslu2-linux.org/wiki/Debian/HomePage ), the right pre-compiled library can be endian-little version at : ftp://ftp.qbang.org/pub/rxtx/ToyBox/2.1-7-build1/Linux/glibc-2.3.5/arm-xscale-linux-gnu/librxtxSerial.so

August 13, 2006, at 10:49 PM by Scott -- New page for serial port set up in Java
Added lines 1-124:

This HowTo leverages the information in OpenSlugJavaInstallWorkaround and USB2Serial, in order to be able to access serial ports from Java (e.g. the javax.comm package)

Starting with OpenSlug 3.10 Beta and using a Belkin F5U003 USB-232 Adapter

After plugging in the adapter, 'cat /proc/bus/usb/devices' reveals the device

T:  Bus=03 Lev=02 Prnt=02 Port=03 Cnt=02 Dev#=  4 Spd=12  MxCh= 0
D:  Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=056c ProdID=8007 Rev= 1.10
S:  Manufacturer=Belkin Components
S:  Product=USB-232 Adapter
S:  SerialNumber=BL3592
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=00(>ifc ) Sub=00 Prot=00 Driver=belkin
E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS=  16 Ivl=0ms
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=8ms

Package installation for hardware:

ipkg install kernel-module-usbserial
ipkg install kernel-module-belkin-sa
depmod -a
modprobe belkin-sa

Confirm hardware detection and installation using 'lsmod'

Module                  Size  Used by
belkin_sa               6916  1
usbserial              23632  3 belkin_sa

and 'ls /dev/ttyUSB*'

crw-rw---- 1 root dialout 188, 0 Aug 14 00:21 /dev/ttyUSB0

NOTE: at this point I rebooted to make sure detection was automatic on boot.

Next, install Java (updates since OpenSlugJavaInstallWorkaround HowTo)

wget http://ipkg.nslu2-linux.org/feeds/unslung/cross/classpath_0.91-1_armeb.ipk
wget http://ipkg.nslu2-linux.org/feeds/unslung/cross/jamvm_1.4.3-1_armeb.ipk
wget http://ipkg.nslu2-linux.org/feeds/unslung/cross/jikes_1.22-1_armeb.ipk
wget http://ipkg.nslu2-linux.org/feeds/unslung/cross/zlib_1.2.3-1_armeb.ipk
wget http://ipkg.nslu2-linux.org/feeds/unslung/cross/libstdc++_5.0.7-4_armeb.ipk

ipkg install classpath_*
ipkg install zlib_*
ipkg install jamvm_*
ipkg install libstdc++_*
ipkg install jikes_*

Serial Port software from "http://www.rxtx.org/"

Using "Linux, Windows, Solaris, Mac OS rxtx-2.1-7-bins-r2.zip (Final)" which can be unzipped anywhere. The required jar file for any execution of serial port access is: RXTXcomm.jar (put in your classpath). The other files in this zip file are not required for execution.

The pre-compiled library used by RXTXcomm.jar was located at:


This file should be placed at: /opt/lib/classpath/librxtxSerial.so in order to be found by jamvm

A simple test file to show detection of the serial ports:

import java.util.*;
import gnu.io.*;
public class Test {
public static void main(String[] args) {
        Enumeration en = CommPortIdentifier.getPortIdentifiers();
        while (en.hasMoreElements()) {
              CommPortIdentifier cpi = (CommPortIdentifier) en.nextElement();
              System.out.println("name=" + cpi.getName());

Compile Test.java

/opt/bin/jikes -classpath /opt/share/jamvm/classes.zip:/opt/share/classpath/glibj.zip:RXTXcomm.jar Test.java

Run Test

/opt/bin/jamvm -classpath .:RXTXcomm.jar Test

Experimental:  JNI_OnLoad called.
Stable Library
Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7

NOTE: The RXTX Serial Package implements the javax.comm features, but it is in it's own Java package (gnu.io). This means any code previously developed for javax.comm with need to be re-compiled after (simply) changing the import statement:

//import javax.comm.*;			// <== commented out
import gnu.io.*;			// new  package
view · edit · print · history · Last edited by aimevareillewanadoofr.
Based on work by aimevareillewanadoofr.
Originally by Scott.
Page last modified on February 15, 2008, at 10:55 AM