org.xml.sax.SAXParseException: Content is not allowed in prolog. is thrown out
when parser a UTF-8 bom formatted XML file
-------------------------------------------------------------------------------------------------------------------------
Key: XERCESJ-1122
URL: http://issues.apache.org/jira/browse/XERCESJ-1122
Project: Xerces2-J
Type: Bug
Components: SAX
Versions: 2.0.0
Environment: Windows XP.
Reporter: lin zhu
The following information is printed when I try to parse an XML file saved in
UTF-8 BOM format:
org.xml.sax.SAXParseException: Content is not allowed in prolog.
at
org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown
Source)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLScanner.reportFatalError(Unknown Source)
at
org.apache.xerces.impl.XMLDocumentScannerImpl$PrologDispatcher.dispatch(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
If I save the very XML file to standard UTF-8 format then everything works
smoothly.
I've tried to debug the source code of Xecers. I found that Xecers actually has
codes that handle UTF-8 BOM formatted input stream in class
org.apache.xerces.impl.XMLEntityManager.java (@version $Id:
XMLEntityManager.java,v 1.94 2005/04/19 03:18:18 mrglavas Exp $). But those
codes has never been executed in my case. The following is the detail:
In public method setupCurrentEntity() in class XMLEntityManager, there are
several lines of codes which dealing with UTF-8 BOM format input stream, and
all those codes are located in the code block starting from line 929 if (
reader == null ) { .... }. The "reader" in the if clause is defined in line
923. And In my case, the reader would not be assigned a "null" value so that
the codes which dealing with UTF-8 BOM would never been executed.
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