Re: Apache Tomcat 6.0 loads blank page

Sun, 01 Feb 2009 15:05:03 -0800 

Hi.
I believe the error will be preventing Tomcat from starting - which is why the restart attempt is failing when it attempts to connect to the shutdown port - according to the log posted. 

Find and fix the XML issue, then you should be good to get Tomcat started.


--
Stephen Souness


André Warnier wrote:

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, André Warnier <a...@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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