Dave,
Thanks for taking the time to test this! It's
actually a problem which one of my co-workers is
having. After I posted to the group I also replicated
his environment and found that I couldn't reproduce
his problem. It's very strange. The only difference
between our environments is that I was running
jdk1.4.1 while he was running jdk1.3.1. I was going
to fall back to 1.3.1 to make sure that that wasn't
the culprit but I guess now I don't have to bother :)
I'm pretty sure his InputSource isn't empty as the
code he sent me was a cut and paste from his servlet.
Still, it might be useful to know that the stack trace
is equivalent to one generated by parsing an empty
string. Thanks again.
-jason
--- Dave Flanagan <[EMAIL PROTECTED]> wrote:
> Hello Jason,
>
> Replicated your environment here to try to to
> replicate the problem
> you are experiencing.
> Running JDK1.3.1_02
> Running Tomcat 4.0.1
> Replaced the xerces.jar file located
> in the C:\tomcat-4.0.1\common\lib directory
> with xerces.jar from xerces 1.4.4
>
> ran you example from both a command line and
> from a sample servlet - and experienced no problem
> in either scenario.
>
> but will offer this up as the potential/probable
> error
> you are experiencing
>
> your variable sInput in your code of the servlet
> is probably not what you think it is:
> I say this because in my working servlet example, if
> I set the value of sInput to the empty string ""
> it will duplicate the stack trace you are
> experiencing.
>
> My recomendation is
> right before your line of code:
> BufferedReader bReader = new BufferedReader(new
> StringReader(sInput));
>
> precede it with
> System.out.println("Sting to be parsed: " +
> sInput);
>
> This should appear in the console and my guess that
> the variable
> sInput is nothing more than the empty string.
> yes this is shouldn't be the case if the code
> snippet you provide is
> exactly what is in the servlet. but it cannot hurt
> to test to see that
> what you are thinking is in sInput - actually is.
>
> hope this helps
>
> Dave Flanagan
>
>
>
> J> --- Michael Glavassevich <[EMAIL PROTECTED]>
> wrote:
> J> Michael,
>
> J> Thanks for the input but actually I've verified
> that
> J> Tomcat IS using xerces 1.44 - the same version
> that we
> J> are both testing with on the command line. Any
> other
> J> thoughts? If it's not encoding I can't imagine
> what
> J> it could be - the xml is about as simple as you
> can
> J> get and it's obviously well formed. Thanks again
> for
> J> the input.
>
> J> -jason
>
> >> Hi Jason,
> >>
> >> This doesn't look like an encoding issue to me.
> >> Since the input source is
> >> a Reader, the parser is already presented with a
> >> stream of characters, and
> >> thus there's nothing to decode. I'm taking a wild
> >> guess, but I
> >> think that the problem might be that the versions
> of
> >> Xerces that your
> >> colleague is executing from the command line and
> >> Tomcat are different.
> >> Specifically the stack trace indicates to me that
> >> the version of Tomcat
> >> includes Xerces-J 1.4.4 or eariler. Perhaps that
> old
> >> version of the parser
> >> had a bug in this area.
> >>
> >> I hope that helps.
> >>
> >> On Mon, 18 Aug 2003, Jason wrote:
> >>
> >> > Hello,
> >> >
> >> > One of my colleagues has run into a bit of a
> >> problem
> >> > with the following code:
> >> >
> >> > try
> >> > {
> >> > DocumentBuilderFactory factory =
> >> > DocumentBuilderFactory.newInstance();
> >> > DocumentBuilder parser =
> >> > factory.newDocumentBuilder();
> >> >
> >> > String sInput = "<?xml
> version=\"1.0\"
> >> >
> >>
>
encoding=\"UTF-8\"?>><RequestType>DISCOVER_DATASOURCES</RequestType>";
> >> >
> >> > BufferedReader bReader = new
> >> > BufferedReader(new StringReader(sInput));
> >> > InputSource is = new
> >> InputSource(bReader);
> >> >
> >> > Document doc = parser.parse(is);
> >> >
> >> > }
> >> > catch (Throwable x)
> >> > {
> >> > }
> >> >
> >> > When he runs it from the command line
> everything
> >> works
> >> > fine but embedded in a servlet running in
> Tomcat
> >> it
> >> > generates the following error/stack trace.
> >> >
> >> > org.xml.sax.SAXParseException: The root element
> is
> >> > required in a well-formed doc
> >> > ument.
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1213
> >> > )
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.framework.XMLDocumentScanner.reportFatalXMLError(XM
> >> > LDocumentScanner.java:570)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.framework.XMLDocumentScanner$XMLDeclDispatcher.endO
> >> > fInput(XMLDocumentScanner.java:790)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.framework.XMLDocumentScanner.endOfInput(XMLDocument
> >> > Scanner.java:418)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.validators.common.XMLValidator.sendEndOfInputNotifi
> >> > cations(XMLValidator.java:712)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.readers.DefaultEntityHandler.changeReaders(DefaultE
> >> > ntityHandler.java:1031)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.readers.XMLEntityReader.changeReaders(XMLEntityRead
> >> > er.java:168)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.readers.AbstractCharReader.changeReaders(AbstractCh
> >> > arReader.java:150)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.readers.AbstractCharReader.lookingAtChar(AbstractCh
> >> > arReader.java:217)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.framework.XMLDocumentScanner$XMLDeclDispatcher.disp
> >> > atch(XMLDocumentScanner.java:686)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentS
> >> > canner.java:381)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1098)
> >> > at
> >> >
> >>
> J>
>
org.apache.xerces.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.
> >> > java:195)
> >> >
> >> > I'm pretty sure this is an encoding issue but
> I'm
> >> not
> >> > really sure how to help him solve it. Any
> >> suggestions
> >> > would be greatly appreciated.
> >> >
> >> > -jason
> >> >
> >> > __________________________________
> >> > Do you Yahoo!?
> >> > Yahoo! SiteBuilder - Free, easy-to-use web site
> >> design software
> >> > http://sitebuilder.yahoo.com
> >> >
> >> >
> >>
> J>
>
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> >> [EMAIL PROTECTED]
> >> >
> >> >
> >>
> >> --
> >> --------------------
> >> Michael Glavassevich
> >> [EMAIL PROTECTED]
> >>
> >>
> J>
>
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> >> [EMAIL PROTECTED]
> >>
>
>
> J> __________________________________
> J> Do you Yahoo!?
> J> Yahoo! SiteBuilder - Free, easy-to-use web site
> design software
> J> http://sitebuilder.yahoo.com
>
> J>
>
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>
>
> --
> Best regards,
> Dave
> mailto:[EMAIL PROTECTED]
>
>
>
>
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