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From "Adam Gordon (JIRA)" <>
Subject [jira] Created: (VALIDATOR-220) EmailValidator fails with ArrayIndexOutOfBoundsException on domain names longer than 10 segments
Date Mon, 15 Jan 2007 18:54:27 GMT
EmailValidator fails with ArrayIndexOutOfBoundsException on domain names longer than 10 segments

                 Key: VALIDATOR-220
             Project: Commons Validator
          Issue Type: Bug
          Components: Framework
    Affects Versions: 1.3.1 Release, 1.3.0 Release
         Environment: $ uname -a
Linux frisky 2.6.17-10-generic #2 SMP Tue Dec 5 22:28:26 UTC 2006 i686 GNU/Linux
            Reporter: Adam Gordon

The EmailValidator class, specifically, the "protected boolean isValidSymbolicDomain(String
domain)" method makes an assumption on the PERL RegEX rules, specifically, that no more than
10 domains/subdomains may be specified in an email address.  I.e. an email address of ""
is valid according to the EmailValidator whereas an email address of ""
causes isValidSymbolicDomain(String) to throw an ArrayIndexOutOfBoundsException because the
"domainSegment" local variable is hard-coded to have a length of 10.  

Whether or not this is due to a limitation in PERL w.r.t. the maximum number of allowed groupings,
I do not know, but the RFC for email addresses does not appear to specify a maximum number.
 Additionally, although I couldn't find it in the RFC, Wikipedia says that the maximum number
of characters for the domain name is 255 - though I am very hesitant to cite/use Wikipedia
as an official source...

Granted, I've never seen a domain name w/ more than 5 subdomain names, let alone 10, but it
seems like it should be supported regardless.

I'd submit a patch, but I wanted to discuss possible courses of action and determine the "right"
(or at least acceptable) one.  Possible solutions are:

1.  check if the counter i in the for loop is > 10 and perform some action that stops the
iterative process.
2.  if the max number of groupings in PERL RegEX is 10, maybe we shouldn't use RegEX to determine
the groupings.

Please let me know if you 1) have an alternative solution and 2) want me to code a/the fix.

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