`Might not have been initialized' is here wrong

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Hi,

I'm using the following piece of code:

==
for (int i = 1; (curr_line = input_file.readLine()) != null; i++) {
    if (i == 1) {
    line_length_ref = curr_line.length();
    }
    else {
         if (curr_line.length() != line_length_ref) {
            System.err.println("Input file must contain same number of columns through rows.");
            System.exit(1);
         }
    } // some other things
    k = i;
}

if (k != line_length_ref) {
// do some things
}
==
The compiler tells me that
* line_length_ref might not have been initialized at L. 6 (numbering
from this first line of code). However, if the else {} block is
launched at some time, line_length_ref will have already been
initialized, so I don't see where's the problem on an algorithmic POV,
* k might not have been initialized.

Do you have any workaround?
- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- --

Remember. If something can go wrong, it will.
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