Re: What are configuration reload defaults?

On Feb 11, 2009, at 9:52 AM, Steve Cohen wrote:

> I have been all over the documentation and I can't find something that
> tells me succinctly what the DEFAULT behavior in regard to  
> configuration
> reloading (PropertyConfigurator.configureAndWatch() or
> DOMConfigurator.configureAndWatch()) is.  My question assumes a non- 
> J2EE
> java application.
>
> Assuming that I do not call these methods from my code but simply  
> drop a
> new log4j configuration file into its defined location in the file
> system, will the new configuration be picked up automatically, (in one
> minute, if I understand the javadocs correctly)?  Or do I have to do
> something (coding or configuration) for this behavior to occur?  If it
> doesn't happen automatically, instead of coding, is it possible to
> define through a log4j.* system property something that turns this
> behavior on?

Configure and watch launches a thread that monitors file changes.  If  
a file change is detected it will load the new configuration file.   
Unless the configuration file specifies a reset (log4j.reset=true or  
reset="true" on log4j:configuration element), the new configuration is  
added to the previous configuration which is an undesirable, but long  
established behavior.

> Also, while on the subject of log4j system properties, is there a list
> anywhere of all the log4j.* properties (such as log4j.debug) that  
> log4j
> responds to when defined either as system properties or in the
> configuration file itself?

A list of system properties was requested as an enhancement for log4j  
1.2.16 and is currently in the source for the FAQ (http://svn.apache.org/repos/asf/logging/log4j/trunk/src/site/fml/faq.fml 
) near the end.  That only includes system properties that are  
accessed independent of the configurator.  It does not describe the  
properties read by the PropertyConfigurator.

> Thank you.  I really appreciate log4j but this information would be  
> nice
> to have.
>
> Steve Cohen
>
>
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