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From André Warnier ...@ice-sa.com>
Subject Re: Tomcat 6 : Warnings at startup
Date Sun, 10 Jun 2012 15:08:59 GMT
André Warnier wrote:
> Konstantin Kolinko wrote:
>> 2012/6/10 André Warnier <aw@ice-sa.com>:
>>> No tomcat 5.5 files have been copied to that system (apart from the 
>>> webapp).
>>> Here is the complete (edited, comments removed) content of
>>> tomcat6/conf/catalina.properties :
>>>
>>> (...)
>>> common.loader=${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar,/var/lib/tomcat6/common/classes,/var/lib/tomcat6/common/*.jar

>>>
>>> server.loader=${catalina.home}/server/classes,${catalina.home}/server/*.jar,/var/lib/tomcat6/server/classes,/var/lib/tomcat6/server/*.jar

>>>
>>> shared.loader=${catalina.home}/shared/classes,${catalina.home}/shared/*.jar,/var/lib/tomcat6/shared/classes,/var/lib/tomcat6/shared/*.jar

>>>
>>
>> The above fragment of catalina.properties explains the issue that you
>> are observing.
>>
>> The "common.loader", "server.loader" and "shared.loader" values
>> provide configuration for Common, Server and Shared classloader, as
>> better documented in 5.5 (Tomcat 6 docs not mention Server and Shared
>> ones, but they still do exist):
>>
>> http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html#Overview
>>
>> If you look at a fresh copy of Tomcat 6, the values would be:
>>
>> [[[
>> common.loader=${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar

>>
>> server.loader=
>> shared.loader=
>> ]]]
>>
>> The ones that you have in your file are a mix of 5.5 and 6.0 values.
>>
>> ClassLoaderFactory.validateFile() method is called in turn for each
>> value in each of the 3 *.loader options and checks that those values
>> point to an existing place, which is a directory and is readable.
>>
>> In your case,
>>
>>> WARNING: Problem with directory [/usr/share/tomcat6/server/classes],
>>> exists: [false], isDirectory: [false], canRead: [false]
>>
>> it looked for [/usr/share/tomcat6/server/classes] and warned you that
>> the said directory does not exist.
>>
>>
> 
> Thank you Konstantin for this very thorough explanation.
> 
> So, it looks like my options to make the warnings disappear are
> - either just create these directories (empty) in CATALINA_HOME
> - or modify the tomcat6/conf/catalina.properties file to remove (direct 
> or indirect) references to /usr/share/tomcat6/server
> 
> As it is now, the file comes from the Tomcat 6 Debian package; I did not 
> modify that file.
> I would imagine that if the Debian package maintainer decided to modify 
> the standard file, he had some reason to do that.
> 
> Based on your knowledge, do you have an idea as to why the Debian Tomcat 
> 6 package maintainer may have considered it a good idea to modify the 
> standard catalina.properties in the way that he did ?  Could it be to 
> make upgrades tomcat 5.5 -> tomcat 6 easier ?
> 
> (To me, there seems to be a curious mixture of "symbolic" 
> (${catalina.home}/*) and "hardwired" (/var/lib/tomcat6/*) references in 
> the Debian version of that file.)
> 
> 

For the record : adding the missing directories under CATALINA_HOME (/usr/share/tomcat6 
here), and making them owned/readable by the tomcat6 user, definitely does it (make the 
WARNING messages disappear) :

Jun 10, 2012 5:03:47 PM org.apache.coyote.http11.Http11Protocol pause
INFO: Pausing Coyote HTTP/1.1 on http-8080
Jun 10, 2012 5:03:48 PM org.apache.catalina.core.StandardService stop
INFO: Stopping service Catalina
Jun 10, 2012 5:03:49 PM org.apache.coyote.http11.Http11Protocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8080

Jun 10, 2012 5:03:57 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Jun 10, 2012 5:03:57 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 408 ms
Jun 10, 2012 5:03:57 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Jun 10, 2012 5:03:57 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.35
Jun 10, 2012 5:03:57 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor myapp.xml
...


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