Newbie needs help with java.lang.ArrayIndexOutOfBoundsException: 10 Error

[jfountai]

Hi all. Learning Java - sorry for my stupidity if you see any.

Here is the code:

private static void readFile() throws Exception {
    Calendar cal = Calendar.getInstance();
    cal.add(Calendar.DATE, DAYS);

    String fOther = "filename.csv";
    String fOtherImp = "filename_imp.csv";

    LineNumberReader lineCounter = new LineNumberReader(
    new InputStreamReader(new FileInputStream(fOther)));
    String nextLine = null;

    try {
	while ((nextLine = lineCounter.readLine()) != null) {
	if (nextLine == null)
              System.out.printf("Null line");
              continue;
        }
	if (lineCounter.getLineNumber() < 10001) {

          BufferedReader br = new BufferedReader(new FileReader (fOther));
          CsvWriter csvOutput = new CsvWriter(new FileWriter(fOtherImp, true), ',');
          log.info("File is OK.  Creating new import file.");

          // Create Headers
          csvOutput.write("Date");
          csvOutput.write("Resort");
          csvOutput.write("Source");
          csvOutput.write("Medium");
          csvOutput.write("Campaign");
          csvOutput.write("Keyword");
          csvOutput.write("Pageviews");
          csvOutput.write("Unique Page");
          csvOutput.write("Exits");
          csvOutput.write("Time on Page");
          csvOutput.write("Bounces");
          csvOutput.endRecord();
--> 
         //String strLine;
          String strLine = null;
          String[] strLine1;

          ArrayList<String> list = new ArrayList<String>();

          while ((strLine = br.readLine()) != null)   {
                    list.add(strLine);
          }

           for (int i = 0; i < list.size(); i++) {
               Pattern p = Pattern.compile("(?<=[c|C]{2}\.)([0-9]+)?(?=\_.|.[html|xml])");
               String row = list.get(i);
               String col1 = row.split(",")[0];
               String col2 = row.split(",")[1];
               String col3 = row.split(",")[2];
               String col4 = row.split(",")[3];
               String col5 = row.split(",")[4];
               String col6 = row.split(",")[5];
               String col7 = row.split(",")[6];
               String col8 = row.split(",")[7];
               String col9 = row.split(",")[8];
               String col10 = row.split(",")[9];
               String col11 = row.split(",")[10];
               if (row == null) {
                    System.out.printf("Null line");
                    continue;
                   }
                String url = row.split(",")[1];
                String resortid = new String();
                //String result = new String();
                Matcher m = p.matcher(url);
                while (m.find()) {
                    resortid = m.group();
                    // Add Data
                    csvOutput.write(col1);
                    csvOutput.write(resortid);
                    csvOutput.write(col3);
                    csvOutput.write(col4);
                    csvOutput.write(col5);
                    csvOutput.write(col6);
                    csvOutput.write(col7);
                    csvOutput.write(col8);
                    csvOutput.write(col9);
                    csvOutput.write(col10);
                    csvOutput.write(col11);
                    csvOutput.endRecord();

                    }
 ---->
             }
        log.info(fOtherImp + " created.");
                csvOutput.close();

        } else {
            log.error("File exceeded 10001 lines. File rejected");
        }
       	} catch (Exception ex) {
          log.error(ex);
        //}  catch (ArrayIndexOutOfBoundsException e) {
	//log.error( "OutOfBounds: "  +  e.getMessage());
   }

I think I know which part of the code (denoted by the --->) that is causing the problem. But I am missing something because of my lack of knowledge :(. Thanks for any info!

[JamesCherrill]

Print the whole of the out-of-bounds exception ( e.printStackTrace(); ) in your catch block - that will tell you the exact line of your program on which it happened.

[jon.kiparsky]

The stack trace would be useful.
However, the problem might be here:

String url = row.split(",")[1];

This gets the second item from the string: if the original string is "XXXXX, YYYY" this would set url to "YYYY". Is this what you intend? If row does not have a comma, this will give you the out of bounds exception.

Similarly, in this part:

String row = list.get(i);
               String col1 = row.split(",")[0];
               String col2 = row.split(",")[1];
               String col3 = row.split(",")[2];
               String col4 = row.split(",")[3];
               String col5 = row.split(",")[4];
               String col6 = row.split(",")[5];
               String col7 = row.split(",")[6];
               String col8 = row.split(",")[7];
               String col9 = row.split(",")[8];
               String col10 = row.split(",")[9];
               String col11 = row.split(",")[10];

You're assuming that your data is well-formed. If row isn't cooperative, again, you'll have that exception.
Also, you might want to do something like this instead, to save some gratuitous method calls:

String[] row = list.get(i).split(",");
               String col1 = row[0];
               String col2 = row[1];  

               ....

[jfountai]

Print the whole of the out-of-bounds exception ( e.printStackTrace(); ) in your catch block - that will tell you the exact line of your program on which it happened.

You rock! Thank you! Now I know what is causing the issue and I am beating my head on the desk because I should have known it :D

thanks again!!

[JamesCherrill]

OK! Mark this thread "solved"?

[jon.kiparsky]

Just one more word on this... best practice says to make your try block as short as possible, and catch exactly the exceptions you're anticipating.

That is, something like this:

{
... safe code ...
try {
  potentiallyUnsafeOperation();
  }
catch (NowYou'veDoneItException e)
{
  //log exception and try to recover
}
... more safe code...
}

After dealing with this issue, you know one of the good reasons for this.