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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Exceptions in Catalina.log and Catalina.yyyy-mm-dd.log files on AS/400
Date Fri, 12 Oct 2012 14:19:03 GMT
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James,

On 10/11/12 3:59 PM, James Lampert wrote:
> Pid * wrote:
> 
>> Examine the first few bytes of the input. I seem to remember a 
>> character encoding issue causing this error.
> 
> Of what input in particular? At least some of these exceptions
> appear to be getting thrown in the process of bringing up Tomcat,
> so I'm guessing we're not talking about a request.

(apologies for the ugly formatting of the stack trace):

> Error at line 1 column 1: Content is not allowed in prolog. 
> Throwable occurred: 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$PrologDispatcher.dispatch(Unknown
>
> 
Source) at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
>
> 
Source)      at
> org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) 
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown 
> Source)                      at 
> org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at
> org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) 
> at
> org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown 
> Source)               at 
> org.apache.tomcat.util.digester.Digester.parse(Digester.java:1537) 
> at 
> org.apache.catalina.startup.TldConfig.tldScanStream(TldConfig.java:515)
>
> 
at
> org.apache.catalina.startup.TldConfig.tldScanWebXml(TldConfig.java:328)
>
> 
[...]

Tomcat is attempting to scan your webapp's web.xml file. So try
something like this:

$ head -n 1 webapps/yourwebapp/web.xml  | od -t x1a

This is what I get from my own web.xml:

0000000    3c  3f  78  6d  6c  20  76  65  72  73  69  6f  6e  3d  22  31
           <   ?   x   m   l  sp   v   e   r   s   i   o   n   =   "   1
0000020    2e  30  22  20  65  6e  63  6f  64  69  6e  67  3d  22  49  53
           .   0   "  sp   e   n   c   o   d   i   n   g   =   "   I   S
0000040    4f  2d  38  38  35  39  2d  31  22  3f  3e  0a
           O   -   8   8   5   9   -   1   "   ?   >  nl
0000054

The very first byte is 0x3c which is '<', etc. If you have a BOM (byte
order mark) you might see something different. I seem to remember
certain BOMs causing problems with Xerces: you might have to trim-off
your BOMs and rely on the encoding="whatever" that you have in the XML
document itself (which really should be the way things work with XML
anyway).

Hope that helps,
- -chris
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