[jdom-interest] Exceptions thrown because of comments before root element

[Jason Hunter]

Dave,

For your project make sure to check out:

http://otn.oracle.com/oramag/oracle/03-mar/o23javaxml.html

-jh-

Dave Bartmess wrote:
> I'm not sure if this is valid XML or not, but I'm trying to write an RSS
> Feed reader/writer/parser, based on jdom. 
> 
> The URL of the file I'm trying to parse is
> http://sourceforge.net/export/rss2_projnews.php?group_id\=63234
> 
> This is a normal standard for several sites that I've seen putting out
> RSS feeds, to put a comment between the xml header element
> (designation?) and the root element.
> 
> Is this valid? If it is, why does SAXBuilder croak on it?
> 
> The code I'm using to read the inputstream and the errors I'm getting
> are below.
> 
> *******************************************
>    protected void read(URL url) throws ChannelParseException {
>       try {
>          org.jdom.input.SAXBuilder builder = new  SAXBuilder(true);
>          setChannel(builder.build(url));
>       }
>       catch (java.net.MalformedURLException exc) {
>          throw new ChannelParseException(exc) ;
>       }
>       catch (org.jdom.JDOMException exc) {
>          throw new ChannelParseException(exc) ;
>       }
>       catch (java.io.IOException exc) {
>          throw new ChannelParseException(exc) ;
>       }
>    }
>    
> **************************************
> org.edingo.JParsse.core.ChannelParseException:
> org.jdom.input.JDOMParseException: Error on line 1 of document
> http://sourceforge.net/export/rss2_projnews.php?group_id\=63234:
> Document root element is missing.
>     at org.edingo.JParsse.core.Channel.read(Channel.java:131)
>     at org.edingo.JParsse.core.Channel.<init>(Channel.java:105)
>     at org.edingo.JParsse.core.Channel.main(Channel.java:654)
> Caused by: org.jdom.input.JDOMParseException: Error on line 1 of
> document
> http://sourceforge.net/export/rss2_projnews.php?group_id\=63234:
> Document root element is missing.
>     at org.jdom.input.SAXBuilder.build(SAXBuilder.java:377)
>     at org.jdom.input.SAXBuilder.build(SAXBuilder.java:724)
>     at org.edingo.JParsse.core.Channel.read(Channel.java:125)
>     ... 2 more
> Caused by: org.xml.sax.SAXParseException: Document root element is
> missing.
>     at org.apache.crimson.parser.Parser2.fatal(Parser2.java:3182)
>     at org.apache.crimson.parser.Parser2.fatal(Parser2.java:3170)
>     at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:501)
>     at org.apache.crimson.parser.Parser2.parse(Parser2.java:305)
>     at
> org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:442)
>     at org.jdom.input.SAXBuilder.build(SAXBuilder.java:370)
>     ... 4 more
>