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help with an exception

 
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hello everyone. i am working on an extra-credit lab for my java course and i am in need of assistance.
i am just not getting this part right here.

what i want that part of the code to do is read in a whole line from a comma separated value text file(format -- username,password) and store it to the string userOrPass and then break it up and call an instance of another class (instance is the log. ) and pass a string to it to store it in an array of strings and then do the same with passwords.
i keep getting NoSuchElementExceptions
is there something in the code that some of you notice or should i post both classes?
thanks in advance for any help
adam
 
author and iconoclast
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Mac OS X Eclipse IDE Chrome
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readValue is a StringTokenizer that will operate on the string in userOrPass, which is the empty string, so calling nextToken() on it even once will give the exception you see.
I think what you intended is to have a StringTokenizer for each individual line, in which case what you need to do is to move that entire line of code inside the while loop, at the top.
 
Adam Jones
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ok, i am having a terrible time with this
i am not sure if the following is what anyone else would do, but it is what i did. if you could, would you take a quick look at it and see if there is anything obvious that i am really messing up
it compiles and when i try to run it i get a NoSuchElementException. in the while loop when i try to fill my String arrays with usernames and passwords. i thought it looked fine but it is not
anyways, any help offered would be greatly appreciated

thank you
adam
[ October 14, 2003: Message edited by: Adam Jones ]
 
Ernest Friedman-Hill
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Just looking at the while loop, it looks OK -- if every single line in the file looks like "foo,bar". If there's a single blank line at the end, you'll see that error. For debugging purposed, you could print out something like "*" + userOrPass + "*" on each iteration, just to see if every line is actually valid. To fix this in the code, you'd want to check if readValue().getNumberOfTokens() returns 2; if not, skip that line (or report an error.)
 
Adam Jones
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ok, one more question and then i should have this....i think
i have changed this part and now it works....well, kind of

after that it will read the file in correctly and store the strings where they need to go, but then when i try to compare them i am getting a NullPointerException....i believe this means a programmer error in any case, so if you could take a quick look back through it i would be thankful
thank you for all of your help
adam
[ October 14, 2003: Message edited by: Adam Jones ]
 
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