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Date: Sun, 01 Feb 2009 23:46:30 +0100
From: =?ISO-8859-1?Q?Andr=E9_Warnier?= <aw@ice-sa.com>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: Apache Tomcat 6.0 loads blank page
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What do you mean the logs are not informative ?
I am no Tomcat expert to interpret the log exactly, but my guess is that 
you have an XML error right into your conf/server.xml file, which is the 
main Tomcat configuration file.  I am quite surprised that Tomcat is 
starting at all.

SEVERE: Parse Fatal Error at line 71 column 8: Comment must start with
 >
You may want to have a look at the position indicated above.
if it is not in server.xml, it is obviously in some other XML file which 
Tomcat tries to read at startup.

zia mohades wrote:
> Hi again:
> 
> Andre thank you for your email:
> 
> 1) when I check the logs I see the follwoing
> 
>    for localhost logs :1-Feb-2009 4:16:04 PM
> org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener: contextInitialized()
> 
>    for catalina logs:  I have this:
> 1-Feb-2009 5:01:42 PM org.apache.tomcat.util.digester.Digester fatalError
> SEVERE: Parse Fatal Error at line 71 column 8: Comment must start with
> "<!--".
> org.xml.sax.SAXParseException: Comment must start with "<!--".
>     at
> com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
>     at
> com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174)
>     at
> com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388)
>     at
> com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1411)
>     at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.startOfMarkup(XMLDocumentFragmentScannerImpl.java:2577)
>     at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2695)
>     at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
>     at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
>     at
> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
>     at
> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
>     at
> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
>     at
> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
>     at
> com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
>     at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1644)
>     at org.apache.catalina.startup.Catalina.load(Catalina.java:516)
>     at org.apache.catalina.startup.Catalina.start(Catalina.java:570)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)
>     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
>     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
> 1-Feb-2009 5:01:42 PM org.apache.catalina.startup.Catalina load
> WARNING: Catalina.start using conf/server.xml:
> org.xml.sax.SAXParseException: Comment must start with "<!--".
>     at
> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1231)
>     at
> com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
>     at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1644)
>     at org.apache.catalina.startup.Catalina.load(Catalina.java:516)
>     at org.apache.catalina.startup.Catalina.start(Catalina.java:570)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)
>     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
>     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
> 1-Feb-2009 5:01:42 PM org.apache.catalina.startup.Catalina start
> INFO: Server startup in 0 ms
> 
>    but again, I can successfully access http://localhost:8080 and blank for
> http://localhost:8080/mms_test. so the log files are not very informative.
> 
> 2) I have downloaded LiveHttpHeaders plugin and followed your instructions.
> Believe it or not when I access http://localhost:8080/mms_test or
> http://localhost:8080 or http://localhost:8080/mms_test , and when i click
> on "Live http headers" form tools , the headers are empty. However when I
> access any other sites , like google , the headers has info in it( as it is
> expected)
> 
> Sooo I am seriously confused and frustated!!! I just dont know what to do!!
> 
> I even tried http://localhost:8080/mms_test/index.html but same problem :(
> 
> sorry again for the hassell but seriously any solution is appreciated!
> 
> 
> thank you kindly
> 
> zia
> 
> 
> 
> On Sun, Feb 1, 2009 at 4:45 PM, Andr� Warnier <aw@ice-sa.com> wrote:
> 
>> zia mohades wrote:
>>
>>> Hello again,
>>>
>>> Qiao thank you for your help. I tried copying the WEB-INF(which includes
>>> web.xml) to mms_test but the problem is still there( blank page). I tried
>>> copying the mms_test somewhere else like to ROOT, but the problem still
>>> remains.  Just to let you know I can successfull view the page
>>> http://localhost:8080/ but get a blank page when try to access the
>>> http://localhost:8080/mms_test/
>>>
>>>  And when you try that second link, and you get the blank page, is there
>> anything in your Tomcat logs ?
>>
>> I mean, when you try to access http://localhost:8080/mms_test/, there are
>> only a limited number of possibilities :
>> - either your browser cannot reach the server.  Then you would get a
>> browser message saying "cannot reach the server". You don't get that, so we
>> assume the browser can reach Tomcat.
>> - or the browser reaches the server, and the server cannot find the
>> requested page (or application), or it cannot access it (permission
>> problem), or there is an error in the application.  Then you would get an
>> error page from Tomcat.  But you do not get that.
>> - so we have to assume that Tomcat finds "something", and is sending it
>> back to the browser.  That something seems to be an empty page.
>> But it certainly comes at least with some HTTP Headers from Tomcat.
>>
>> If there is nothing in the Tomcat logs :
>> If you are using Firefox as a browser (recommended), get and install the
>> LiveHttpHeaders plugin. Here :
>> https://addons.mozilla.org/en-US/firefox/addons/versions/3829
>>
>> That is a plugin that allows you to see the HTTP Headers that the webserver
>> is sending along with the response (the blank page).
>> (If IE, get a similar plugin (Fiddler2 ?).)
>> Anyway, activate the plugin (in Firefox, LiveHttpHeaders appears in the
>> Tools menu, just click on it. It opens its own window).
>> Then just go back to the main window, call up your mmtest link, and look in
>> the LiveHttpHeaders window, what exactly the server sent.
>>
>>
>>
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> 


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