Hi all,


while working on a simple SMS receiver project using Huawei modem, i got this Errors:

Exception in thread "SMSLib-AsyncMessageProcessor : " java.lang.StringIndexOutOfBoundsException: String index out of range: -12
at java.lang.String.substring(String.java:1937)
at org.smslib.modem.ModemGateway.readMessagesPDU(ModemGateway.java:546)
at org.smslib.modem.ModemGateway.readMessages(ModemGateway.java:208)
at org.smslib.modem.AModemDriver$AsyncMessageProcessor.run(AModemDriver.java:878)

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i tried my best to get rid of it, but the luck was not with me. so, i decided to go to the brute force method :)


i extracted the SMSLib source into my project folder. then i started the project.

i found that the problem occurred  in file called ModemGateway.java at line 541:

memIndex = Integer.parseInt(line.substring(i + 1, j).trim());

but  in fact the problem was not in the line itself, it was a problem with the variable (line). by looking above line 541 we will found two (if) statements as following:

if (line.length() < = 0 || line.equalsIgnoreCase("OK")) break;
if (line.length() <= 0 || line.equalsIgnoreCase("ERROR")) break;

those two statements deals with non required lines. i used the Debugger in order to trace possible (line) values and i got the following possibilities:

CMGL: 0,1,,20
CMS ERROR: 321
OK
Error

it  is pretty  clear that the case “CMS ERROR: 321″ is the one that causes the problem since it has not been handled. so i added the following line to the code:

if (line.length() < = 0 || line.contains("CMS ERROR:")) break;

i think that this solves the problem for the time being

all the best


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