The following comment has been added to this issue:
Author: larry oneill
Created: Tue, 5 Oct 2004 5:57 AM
Body:
Michael Glavassevich makes a fair point that a zero count should never be returned
from a InputStream read (unless a length of zero was requested).
I still think there may be some case for a little defensive programming here but
appreciate that not every potentially erroneous situation can be catered for.
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View this comment:
http://issues.apache.org/jira/browse/XERCESJ-1015?page=comments#action_53714
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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: Resolved
Priority: Major
Resolution: INVALID
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: Tue, 5 Oct 2004 5:57 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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