im using sample codes for configure the smslib.. sending sms is ok but the 
problem is receiving sms.. it always generating following exception....

test 01
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: 3.5.2
log4j:WARN No appenders could be found for logger (smslib).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for 
more info.
>>> Gateway Status change for sandaru, OLD: STOPPED -> NEW: STARTING
>>> Gateway Status change for sandaru, OLD: STARTING -> NEW: STARTED

Modem Information:
  Manufacturer: ZTE CORPORATION
  Model: MF100
  Serial No: 353164042495652
  SIM IMSI: ** MASKED **
  Signal Level: -91 dBm
  Battery Level: 100%

count >>>>>>>>>>>>>>> 0
java.lang.StringIndexOutOfBoundsException: String index out of range: 
-12String index out of range: -12

    at java.lang.String.substring(String.java:1938)
    at org.smslib.modem.ModemGateway.readMessagesPDU(ModemGateway.java:545)
    at org.smslib.modem.ModemGateway.readMessages(ModemGateway.java:210)
    at org.smslib.Service.readMessages(Service.java:500)
    at org.smslib.Service.readMessages(Service.java:388)
    at org.smslib.Service.readMessages(Service.java:411)
    at messenger.ReadMessage.doIt(ReadMessage.java:102)
    at messenger.ReadMessage.main(ReadMessage.java:165)
>>> Gateway Status change for sandaru, OLD: STARTED -> NEW: STOPPING
>>> Gateway Status change for sandaru, OLD: STOPPING -> NEW: STOPPED
test 01


what is the reason for this im university student and im doing my project 
with this i need immediate help pls.......... refer the following codes... 
those are the codes changed by my self


package messenger;

import java.util.ArrayList;
import java.util.List;
import javax.crypto.spec.SecretKeySpec;
import org.smslib.AGateway;
import org.smslib.AGateway.GatewayStatuses;
import org.smslib.AGateway.Protocols;
import org.smslib.ICallNotification;
import org.smslib.IGatewayStatusNotification;
import org.smslib.IInboundMessageNotification;
import org.smslib.IOrphanedMessageNotification;
import org.smslib.InboundMessage;
import org.smslib.InboundMessage.MessageClasses;
import org.smslib.Library;
import org.smslib.Message.MessageTypes;
import org.smslib.Service;
import org.smslib.crypto.AESKey;
import org.smslib.modem.SerialModemGateway;

public class ReadMessage
{
    public void doIt() throws Exception
    {
        
        // Define a list which will hold the read messages.
        List<InboundMessage> msgList;
        // Create the notification callback method for inbound & status 
report
        // messages.
        InboundNotification inboundNotification = new InboundNotification();
        // Create the notification callback method for inbound voice calls.
        CallNotification callNotification = new CallNotification();
        //Create the notification callback method for gateway statuses.
        GatewayStatusNotification statusNotification = new 
GatewayStatusNotification();
        OrphanedMessageNotification orphanedMessageNotification = new 
OrphanedMessageNotification();
        try
        {
            System.out.println("Example: Read messages from a serial gsm 
modem.");
            System.out.println(Library.getLibraryDescription());
            System.out.println("Version: " + Library.getLibraryVersion());
            // Create the Gateway representing the serial GSM modem.
            SerialModemGateway gateway = new 
SerialModemGateway("sandaru","COM4",115200,"zte","MF100");
            // Set the modem protocol to PDU (alternative is TEXT). PDU is 
the default, anyway...
            gateway.setProtocol(Protocols.PDU);
            // Do we want the Gateway to be used for Inbound messages?
            gateway.setInbound(true);
            // Do we want the Gateway to be used for Outbound messages?
            gateway.setOutbound(true);
            // Let SMSLib know which is the SIM PIN.
            gateway.setSimPin("0000");
            // Set up the notification methods.
           
 Service.getInstance().setInboundMessageNotification(inboundNotification);
            Service.getInstance().setCallNotification(callNotification);
           
 Service.getInstance().setGatewayStatusNotification(statusNotification);
           
 
Service.getInstance().setOrphanedMessageNotification(orphanedMessageNotification);
            // Add the Gateway to the Service object.
            Service.getInstance().addGateway(gateway);
            // Similarly, you may define as many Gateway objects, 
representing
            // various GSM modems, add them in the Service object and 
control all of them.
            // Start! (i.e. connect to all defined Gateways)
            Service.getInstance().startService();
            // Printout some general information about the modem.
            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();
            // In case you work with encrypted messages, its a good time to 
declare your keys.
            // Create a new AES Key with a known key value. 
            // Register it in KeyManager in order to keep it active. SMSLib 
will then automatically
            // encrypt / decrypt all messages send to / received from this 
number.
           
 Service.getInstance().getKeyManager().registerKey("+94714969763", new 
AESKey(new SecretKeySpec("0011223344556677".getBytes(), "AES")));
            
            // Read Messages. The reading is done via the Service object and
            // affects all Gateway objects defined. This can also be more 
directed to a specific
            // Gateway - look the JavaDocs for information on the Service 
method calls.
            msgList = new ArrayList<InboundMessage>();
            System.out.println("count >>>>>>>>>>>>>>> 
"+Service.getInstance().getInboundMessageCount());
            
Service.getInstance().readMessages(msgList,MessageClasses.UNREAD);//ERROR>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<
//I think Error is in here
            for (InboundMessage msg : msgList)
                System.out.println(msg);
            // Sleep now. Emulate real world situation and give a chance to 
the notifications
            // methods to be called in the event of message or voice call 
reception.
            System.out.println("Now Sleeping - Hit <enter> to stop 
service.");
            System.in.read();
            System.in.read();
        }
        catch (Exception e)
        {
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
        finally
        {
            Service.getInstance().stopService();
        }
    }

    public class InboundNotification implements IInboundMessageNotification
    {
        public void process(AGateway gateway, MessageTypes msgType, 
InboundMessage msg)
        {
            if (msgType == MessageTypes.INBOUND) System.out.println(">>> 
New Inbound message detected from Gateway: " + gateway.getGatewayId());
            else if (msgType == MessageTypes.STATUSREPORT) 
System.out.println(">>> New Inbound Status Report message detected from 
Gateway: " + gateway.getGatewayId());
            System.out.println(msg);
        }
    }

    public class CallNotification implements ICallNotification
    {
        public void process(AGateway gateway, String callerId)
        {
            System.out.println(">>> New call detected from Gateway: " + 
gateway.getGatewayId() + " : " + callerId);
        }
    }

    public class GatewayStatusNotification implements 
IGatewayStatusNotification
    {
        public void process(AGateway gateway, GatewayStatuses oldStatus, 
GatewayStatuses newStatus)
        {
            System.out.println(">>> Gateway Status change for " + 
gateway.getGatewayId() + ", OLD: " + oldStatus + " -> NEW: " + newStatus);
        }
    }

    public class OrphanedMessageNotification implements 
IOrphanedMessageNotification
    {
        public boolean process(AGateway gateway, InboundMessage msg)
        {
            System.out.println(">>> Orphaned message part detected from " + 
gateway.getGatewayId());
            System.out.println(msg);
            // Since we are just testing, return FALSE and keep the 
orphaned message part.
            return false;
        }
    }

    public static void main(String args[])
    {
        ReadMessage app = new ReadMessage();
        try
        {
            System.out.println("test 01");
            app.doIt();
            System.out.println("test 01");
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}
 

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