 | | | Issue Comment Edited: (XERCESJ-589) Bug with pattern restriction on long | Issue Comment Edited: (XERCESJ-589) Bug with pattern restriction on long 2007-06-12 - By Michael Glavassevich (JIRA)
[ https://issues.apache.org/jira/browse/XERCESJ-589?page=com.atlassian.jira
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Michael Glavassevich edited comment on XERCESJ-589 at 6/12/07 8:23 PM:
-----------------------------------------------------------------------
The number of recursive calls to matchString() is proportional to the length of
the input. Increasing the stack size can be used to avoid the problem, but as
Christiaan pointed out the string could be of any length so regardless of how
large a stack you specify there will always be an input which is large enough
to cause it to overflow.
For folks watching this bug report who wonder why it's has been open for so
long without a fix, it's primarily been because none of the current developers
know this part of the code particularly well (a lot of it is older than Xerces
itself and not well commented; 8+ years) and haven't had the time to learn the
details well enough to do the re-design (recursion -> iteration). Likely it
will be fixed one day, but probably only in the near future if someone from the
community contributes a patch with a description of the changes and some unit
tests to help verify it.
was:
The number of recursive calls to matchString() is proportional to the length of
the input. Increasing the stack size can be used to avoid the problem, but as
Christiaan pointed out the string could be of any length so regardless of how
large a stack you specify there will always be an input which is large enough
that will cause it to overflow.
For folks watching this bug report who wonder why it's has been open so long
without a fix, it's primarily been because none of the current developers know
this part of the code particularly well (a lot of it is older than Xerces
itself and not well commented; 8+ years) and haven't had the time to the learn
details well enough to do the re-design (recursion -> iteration). Likely it
will be fixed one day, but probably only in the near future if someone from the
community contributes a patch with a description of the changes and some unit
tests to help verify it.
> Bug with pattern restriction on long strings
> --------------------------------------------
>
> Key: XERCESJ-589
> URL: https://issues.apache.org/jira/browse/XERCESJ-589
> Project: Xerces2-J
> Issue Type: Bug
> Components: XML Schema Structures
> Affects Versions: 2.3.0
> Environment: Operating System: All
> Platform: All
> Reporter: Mark Woon
> Attachments: test.xml, test.xsd, test.zip
>
>
> There is a bug with applying a pattern restriction on long strings while
trying
> to validate an XML file against a schema. I'm including an xml file and xsd
> file that demonstrates this problem. One character less in <sequence> and the
> problem does not occur.
> As it is, I'm getting
> java.lang.StackOverflowError
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> at
> org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown
Source)
> ...
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