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From Remko Popma <rem...@yahoo.com>
Subject Re: Simple test case for logging uner a tomcat web app
Date Thu, 25 Apr 2013 05:05:10 GMT

Glad to be of help. 

First, you NEED a root logger. I finished analysis of the bug and other loggers are ignored
if no root element exists. 
Not sure yet if we'll fix the code or the docs, but that is the behavior of beta5. 

The default (nameless) package doesn't play well with logger names. 
You'd need to specify the class name as the logger name. Wildcarts like "*" won't work. ""
didn't work for me. Better use the root logger. 
(In your own code I'd strongly recommend using packages for anything that isn't throw-away
code. )

Hope this helps,

Sent from my iPhone

On 2013/04/25, at 11:59, Peter DePasquale <peter.depasquale@gmail.com> wrote:

> Thanks Remko, you have validated my sanity.
> I was finally able to sit down tonight and integrate in your suggestions
> and all works well. I'm also thrilled to have found a bug! Now I can return
> to successful logging in my application and track down a bunch of other
> problems on my end.
> I'm sure I will have additional questions... oh here's one...
> As a college instructor of Java we often don't teach packaging in the first
> semester, so I see a lot of code that is not packaged.
> As I was fiddling with my test case, I attempted (earlier) to use
> unpackaged code and to make a named logger to catch the trace messages. I'm
> guessing that I should really use a root logger for this, but are named
> loggers able to support unpackaged code?
> That is, can I do this?
> <loggers>
>  <logger name="*" level="trace">
>    <appender-ref ref="foo"/>
>  </logger>
> </loggers>
> Or, should one use: name=""?  I think I actually got this to work once, but
> it was not clear if this is a valid approach. Again, I'm guessing the root
> logger is the way to go here.
> Thanks again for the help!
> On Wed, Apr 24, 2013 at 1:39 AM, Remko Popma <remkop@yahoo.com> wrote:
>> Peter,
>> I don't have Tomcat installed but I was able to reproduce the problem in a
>> standalone test using your configuration.
>> There is a couple of things I found.
>> First, File appenders have these configuration settings by default:
>> bufferedIO="true" and immediateFlush="false".
>> This means that messages will not be written to disk until the buffer is
>> full.
>> I think we should improved the documentation for this and I've filed this
>> JIRA ticket:
>> https://issues.apache.org/jira/browse/LOG4J2-218
>> Second, looks like you found a bug!
>> Even after adding immediateFlush="true" to the File config, the
>> trace-log.txt file is empty.
>> I don't understand the underlying cause yet, but if the config has a named
>> logger
>> and no root logger, the named logger internally ends up with no Appender
>> objects.
>> I've filed another JIRA for this:
>> https://issues.apache.org/jira/browse/LOG4J2-219
>> Workaround:
>> 1. Specify immediateFlush="true" in the File appender config
>> 2. Replace the named logger with a root logger configuration
>> The config below worked for me.
>> (In my standalone test, that is. I haven't installed Tomcat.
>> Can you try this and let me know if there is any problem?)
>> <?xml version="1.0" encoding="UTF-8"?>
>> <configuration status="warn">
>>        <appenders>
>>                <File name="tracelog"
>> fileName="${sys:catalina.base}/logs/trace-log.txt"
>>                                immediateFlush="true" append="false">
>>                        <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t]
>> %-5level %logger{36} - %msg%n"/>
>>                </File>
>>        </appenders>
>>        <loggers>
>>                <root level="trace">
>>                        <appender-ref ref="tracelog"/>
>>                </root>
>>        </loggers>
>> </configuration>
>> Sent from my iPhone
>> On 2013/04/24, at 10:13, Peter DePasquale <peter.depasquale@gmail.com>
>> wrote:
>>> I continue to struggle achieving basic logging results under my web app
>>> under tomcat. It seemed to work months ago, but when I upgraded to the
>>> latest beta logging failed.
>>> I returned to examine my config and failed to solve the problem. I
>> emailed
>>> this list about this and I received no response. After asking for help a
>>> second time Ralph suggested I post code.
>>> Thus, I have attempted to simplify my problem down and post a VERY SIMPLE
>>> web app that attempts to do trace and error logging.  I was trying to get
>>> this into to separate files, but I'm learning that that's apparently not
>>> really the model I should embrace as a logging novice.
>>> Now I have trace logging going to one file. However, despite the app
>>> running successfully, an empty log file is created.  I can't determine
>> what
>>> I'm doing wrong and seek help one last time on my inability to grasp the
>>> correct form for logging of this nature.
>>> I really don't want to go back to println statements, but if I can't make
>>> this work, I will. My application is my academic research project and I'm
>>> delayed in developing new features because I got mired down in trying to
>>> solve these issues so that I can support logging in my app (seemed smart
>> at
>>> the time).
>>> Regardless, the code is posted here at github. I welcome any help that
>>> anyone can provide by download or visual inspection. I am posting this
>> and
>>> setting away for the night as I can not work on this today any longer.
>>> My setup is a Mac OSX 10.6 running Tomcat 7.0.37 locally. Beyond the
>> basic
>>> apps that Tomcat is preloaded with, this is the only running app.
>>> https://github.com/depasqua/log4j2tester
>>> Thanks. Sorry for my vent.
>>> --
>>> Peter J. DePasquale, Ph.D.
>>> Department of Computer Science
>>> The College of New Jersey
>>> (e) depasqua [at] tcnj [dot] edu
>>> (p) 609-771-2806
>>> (f) 609-637-5190
>>> (o) Holman Hall - Room 238
>>> (l) Holman Hall - Room 255
> -- 
> Peter J. DePasquale, Ph.D.
> Department of Computer Science
> The College of New Jersey
> (e) depasqua [at] tcnj [dot] edu
> (p) 609-771-2806
> (f) 609-637-5190
> (o) Holman Hall - Room 238
> (l) Holman Hall - Room 255

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