Scanner.nextLine（）上的NoSuchElementException

Question

I don't know why I keep getting this exception because I only have my scanner process the lines when it hasNext(). It will print the lines but then throw this exception. Here is my code:

PagesCollection tester = new PagesCollection();

String fileName = (args.length >  0)? args[0] : "none";
Scanner scan = new Scanner(new FileInputStream(fileName), "UTF-8");

while (scan.hasNext()) {
  String line = scan.nextLine();
  line = line.replace("\n", "").replace("\r", "");
  System.out.println(line);
  Page newPage = new Page(line);
  tester.addPage(newPage);
}

Exception:

java.util.NoSuchElementException: No line found at java.util.Scanner.nextLine(Scanner.java:1516) 
at Webpage.countLines(Page.java:38) at Webpage.compareTo(Page.java:60) 
at Webpage.compareTo(Page.java:14) 
at java.util.Arrays.mergeSort(Arrays.java:1144) 
at java.util.Arrays.sort(Arrays.java:1079) 
at PagesCollection.addPage(PagesCollection.java:32) 
at PagesCollection.main(PagesCollection.java:75)

Answer 1

Since you get the same error when changing scan.nextLine to scan.next , looks like you might've stumbled across this bug[1].

• [1] http://bugs.java.com/bugdatabase/view_bug.do?bug_id=8139414

Answer 2

It could be text in the file without "\\n" character. So, hasNext() is true but nextLine() doesn't exist.

Better use check hasNextLine() to be sure about next line.