OPERATING SYSTEM(S):
All platforms.

FULL JDK VERSION(S):
java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode)

DESCRIPTION:
The java.util.Scaner class behaves differently between Java5 and Java6.

This may or may not be related to the change described by 6269946.

Reproduction instructions:

1. Compile the attached testcase.
2. Run the testcase on a 5.0 JRE: "java ShowBug inputfile.txt"
3. Run the testcase on a 6 JRE: "java ShowBug inputfile.txt"
4. Note the differing output.


Example results:

Java 5:
c:\>java ShowBug inputfile.txt
Start found
Middle found
End found
dropped out, next is END

Java 6:
c:\>java ShowBug inputfile.txt
Start found
dropped out, next is MIDDLE


Testcase Source:

---------------------------------------------------------------
ShowBug.java
---------------------------------------------------------------
import java.util.regex.*;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.NoSuchElementException;
import java.util.Scanner;

public class ShowBug {

    public static void main(String[] args) {

        if (args.length > 0)
            readFile(args[0]);
        else
            readFile(null);

    }

    private static void readFile(String fileName) {
        Scanner scanner=null;

        if ( fileName == null) {
            scanner = new Scanner(System.in);
        } else {

            try {
                File file = new File(fileName);
                scanner = new Scanner(file);
            } catch (FileNotFoundException e) {
                System.err.printf("Can't find %s file , quiting\n", fileName);
                System.exit(1);
            }
        }

        if (scanner. findWithinHorizon("START",0) == null) {
            System.err.println("Can't find start");
            System.exit(1);
        }


        System.out.printf("Start found\n");

        while (scanner.findInLine("MIDDLE") != null) {
            // while (scanner.findWithinHorizon("MIDDLE",0) != null) {

            System.out.println("Middle found");

            if (scanner.hasNext("END")) {
                System.out.printf("End found\n");
                break;
            }
        }

        System.out.printf("dropped out, next is %s\n", scanner.next());


        scanner.close();
    }
}
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---------------------------------------------------------------
inputfile.txt
---------------------------------------------------------------
START
MIDDLE
END
stuff after end
---------------------------------------------------------------