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From xerces-j-...@xml.apache.org
Subject [jira] Created: (XERCESJ-1015) Zero byte read on InputStream causes false SAXParseException when LF at end of file
Date Fri, 01 Oct 2004 16:37:31 GMT
Message:

  A new issue has been created in JIRA.

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View the issue:
  http://issues.apache.org/jira/browse/XERCESJ-1015

Here is an overview of the issue:
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        Key: XERCESJ-1015
    Summary: Zero byte read on InputStream causes false SAXParseException when LF at end of
file
       Type: Bug

     Status: Unassigned
   Priority: Major

    Project: Xerces2-J
 Components: 
             SAX
   Versions:
             2.6.0
             2.6.2

   Assignee: 
   Reporter: larry oneill

    Created: Fri, 1 Oct 2004 9:36 AM
    Updated: Fri, 1 Oct 2004 9:36 AM
Environment: Windows XP, 586

Description:
Under the following circumstances false SAXParseExceptions are thrown.

When a document is being parsed and has reached the end of the document.
If the InputStream supplying the document returns a 0 length indicator (meaning no bytes currently
available) AND
There is a Line Feed character at the end of the file, after the last element (without a carriage
return).
Then a false SAXParseException with one of the two following messages is thrown:
"Content is not allowed in trailing section"
or 
"The markup in the document following the root element must be well-formed"

This could happen if the InputStream is reading from a buffer whose writer thread has returned
a 0 instead of -1 when the buffer is closed. While the writer to the buffer should return
a -1 on buffer close, in practice this may not always happen and Xerces should cater for it.
 It certainly should not throw a spurious exception.

If a zero byte count is returned by an InputStream read while reading in the middle of the
document an ArrayIndexOutOfBounds exception is thrown.

I will include sample code to demonstrate both of these cases and a possible fix for the problem.


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