Link your /dev/ttyACM0 to /dev/tty20 (or a similar unused port) and
use that instead.
For more info: 
http://code.google.com/p/smslib/wiki/Common_Questions#Linux_and_undetectable_ports

On Mar 10, 2:47 pm, aathisankar c <[email protected]> wrote:
> Hi Thanasis,
>
>    I cannot find the JavaComm for linux , i am using RxTx ,.. Still i got
> the following error,
> javac ReadMessages.java
> [r...@technocraft sms]# java ReadMessages
> Example: Read messages from a serial gsm modem.
> SMSLib: A Java API library for sending and receiving SMS via a GSM modem or
> other supported gateways.
> This software is distributed under the terms of the Apache v2.0 License.
> Web Site:http://smslib.org
> Version: 3.3.3
> Experimental: JNI_OnLoad called.
> Stable Library
> =========================================
> Native lib Version = RXTX-2.1-7
> Java lib Version = RXTX-2.1-7>>> Gateway Status change for modem.com1, OLD: 
> STOPPED -> NEW: RESTART
>
> org.smslib.GatewayException: Comm library exception:
> java.lang.RuntimeException: gnu.io.NoSuchPortException
>   at
> org.smslib.modem.SerialModemDriver.connectPort(SerialModemDriver.java:92)
>   at org.smslib.modem.AModemDriver.connect(AModemDriver.java:110)
>   at org.smslib.modem.ModemGateway.startGateway(ModemGateway.java:126)
>   at org.smslib.Service$1Starter.run(Service.java:222)>>> Gateway Status 
> change for modem.com1, OLD: RESTART -> NEW: STOPPED
>
> any idea about that....
> when i type dmseg in terminal ..
> usb 4-1: new full speed USB device using uhci_hcd and address 2
> usb 4-1: configuration #1 chosen from 1 choice
> cdc_acm 4-1:1.8: *ttyACM0*: USB ACM device
> usbcore: registered new interface driver cdc_acm
> drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB
> modems and ISDN adapters
>
> i found the modem is attached to /dev/ttyACM0 ..
> but when running the program by  supplying the identified port as input it
> throws error message ...
> Thanks in advance..
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