Getting gateway falure when sending sms using smslib

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I am sending sms using my nokia phone as modem . It was working 2 days ago when i tried it but now i get Sending failed due to gateway failure . It still works fine when i run it as a java application but doesn't work when run on jboss .I don't know what could have changed. The Exception i get is

GTW: modem.com3: Opening: COM4 @9600
GTW: modem.com3: GSM: Registered to home network.
GTW: modem.com3: MEM: Storage Locations Found:
GTW: modem.com3: Retrying the detection of CNMI, modem busy?
GTW: modem.com3: Retrying the detection of CNMI, modem busy?
GTW: modem.com3: Retrying the detection of CNMI, modem busy?
GTW: modem.com3: CNMI detection failed, proceeding with defaults.
GTW: modem.com3: Callback indications were *not* set succesfully!
GTW: modem.com3: Signal level/bit error rate: +CSQ: 20,99
OK
GTW: modem.com3: Error: unknown: Retrying...
sendMessage(): Gateway modem.com3 does not respond, marking for restart.
===============================================================================
<< OutboundMessage >>
-------------------------------------------------------------------------------
Gateway Id: *
Message Id: 1
Message UUID: 5918a253-6eb0-44b8-a4ee-2aa6129f8ce3
Encoding: 7-bit
Date: Mon Apr 04 12:41:03 PKT 2016
SMSC Ref No:
Recipient: 03115234389
Dispatch Date: null
Message Status: FAILED
Failure Cause: GATEWAY_FAILURE
Validity Period (Hours): -1
Status Report: false
Source / Destination Ports: -1 / -1
Flash SMS: false
Text: "Hey"
PDU data: <cannot extract="" udh="" present="">
Scheduled Delivery: null

What I have tried:

private void sendSMS(String mobile1, String subject, String body) {
    OutboundNotification outboundNotification = new OutboundNotification();
    System.out.println("Example: Send message from a serial gsm modem.");
    System.out.println(Library.getLibraryDescription());
    System.out.println("Version: " + Library.getLibraryVersion());
    SerialModemGateway gateway = new SerialModemGateway("modem.com3", "COM4", 9600, "", "");
    gateway.setInbound(true);
    gateway.setOutbound(true);
    Service.getInstance().setOutboundMessageNotification(outboundNotification);
    try {
        Service.getInstance().addGateway(gateway);      
        Service.getInstance().startService();           
        System.out.println();
        System.out.println("Modem Information:");        
        System.out.println("  Manufacturer: " + gateway.getManufacturer());     
        System.out.println("  Model: " + gateway.getModel());
        System.out.println("  Serial No: " + gateway.getSerialNo());
        System.out.println("  SIM IMSI: " + gateway.getImsi());
        System.out.println("  Signal Level: " + gateway.getSignalLevel() + " dBm");
        System.out.println("  Battery Level: " + gateway.getBatteryLevel() + "%");
        System.out.println();
        OutboundMessage msg = new OutboundMessage(mobile1, body);
        Service.getInstance().sendMessage(msg);
        System.out.println(msg);
        System.out.println("Now Sleeping - Hit <enter> to terminate.");
        System.in.read();
        Service.getInstance().stopService();        
        Service.getInstance().removeGateway(gateway);
    } catch (Exception e) {         
        e.printStackTrace();                    
        try {
            Service.getInstance().stopService();
            Service.getInstance().removeGateway(gateway);
        } catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
    }
}

public class OutboundNotification implements IOutboundMessageNotification
  {
          public void process(AGateway gateway, OutboundMessage msg)
          {
                  System.out.println("Outbound handler called from Gateway: " + gateway.getGatewayId());
                  System.out.println(msg);
          }
  }