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From Henning <henning.bl...@gmail.com>
Subject Re: Tomcat JULI resets JDK logging?
Date Wed, 10 Feb 2010 09:47:55 GMT
Chris,

  yes I did. The code below was meant to be a simplified example. I
created a bug report on that in the meantime:
https://issues.apache.org/bugzilla/show_bug.cgi?id=48716

  As far I understand now, once the default LogManager of the JDK got
used (i.e. by retrieving a logger or setting defaul logging config),
LogManager.getLogManager() will consistently return that LogManager
implementation and never JULI's. 

  JULI however calls LogManager.getLogManager().reset() as a side effect
of a context stop() (e.g. when removing an app from tomcat) so that all
JDK logging config gets reset :-(

  I understand that the intention of JULI is to only reset the
configuration associated with the WebappLoader and it does so, once it
had its own LogManager implementation registered. When embedding tomcat
and using JDK Logging that is however almost certainly not the case. 

  If you are involved with JULI, you might be able to provide a good
solution. I thought testing whether the current LogManager is indeed
JULI's before calling reset could be a remedy. But as I don't know JULI
by heart, there might be other problems in that.

Thanks,
  Henning


On Tue, 2010-02-09 at 17:37 -0500, Christopher Schultz wrote:

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> Hash: SHA1
> 
> Henning,
> 
> On 2/7/2010 6:26 PM, Henning Blohm wrote:
> > I am using JDK logging and I would like to make sure that Tomcat JULI
> > does not modify logging runtime configuration that is not owned by
> > tomcat or web apps running on tomcat.
> > 
> > Here is what happens:
> > 
> > When adding a standard context and removing it again, it seems that JULI
> > resets or modifies otherwise the current logging configuration.
> > 
> > For example: This code:
> > 
> > <code>
> > logger.setLevel(Level.INFO);
> > logger.info("adding...");
> > StandardContext sc = addContext(c); 
> > logger.info("added");
> > System.out.println(logger.getLevel());		
> > logger.info("removing...");
> > removeContext(c,sc);
> > logger.info("removed");
> > System.out.println(logger.getLevel());
> > </code>
> 
> Have you tried creating a separate ClassLoader for the purposes of
> segregating Tomcat? IF you do that, it's likely that JULI won't reset
> your Java logging configuration.
> 
> - -chris
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