A DESCRIPTION OF THE PROBLEM :
The file reading code in the exmple, here:

FileInputStream fis = new FileInputStream(args[0]);
BufferedInputStream bufin = new BufferedInputStream(fis);
byte[] buffer = new byte[1024];
int len;
while (bufin.available() != 0) {
    len = bufin.read(buffer);
    dsa.update(buffer, 0, len);
};
bufin.close();

is invalid -- .available() is used incorrectly and as such the entire file may not be read. A reader may in fact encounter a problem with this code.


URL OF FAULTY DOCUMENTATION :
http://java.sun.com/docs/books/tutorial/security1.2/apisign/step3.html
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