RE: RollingFileAppender disk full handling

["Wullschleger, Donat" <Do...@siemens.co.uk>]

Colin,

I tried a similar thing with the DailyRollingFileAppender (or for test
purposes just with the FileAppender). My aim was to ask the user to replace
the media if it is full with a new one or choose another location for the
logfile. To detect an exception or another error condition, I did add a
custom errorhandler (as Kevin suggested). But I stumbled when I wanted to
close the logfile and open a new one afterwards - I just couldn't find a
solution as 'reset' and 'close' also close the logger (and not only the
file) and after calling these functions log4j issues errormessages on the
console...

If you get any further, I would appreciate to hearing from you. 

Donat

P.S. please find below a code fragment of how I added the custem
errorhandler (LogFileErrorHandler) to all FileAppenders.

// Add custom errorhandler to all FileAppenders
Enumeration eapp = LogManager.getRootLogger().getAllAppenders();
        
for (Enumeration e = eapp;e.hasMoreElements();) {
   Object obj = e.nextElement();
   if (obj instanceof FileAppender) {
       FileAppender fa = (FileAppender) obj;
       LogFileErrorHandler lfh = new LogFileErrorHandler();
       fa.setErrorHandler(lfh);
    }
}



-----Original Message-----
From: Kevin Steppe [mailto:ksteppe@pacbell.net]
Sent: Wednesday, July 31, 2002 9:35 PM
To: Log4J Users List
Subject: Re: RollingFileAppender disk full handling


Colin,
    log4j does not throw exceptions.  However, the RollingFileAppender 
-should- make calls to the errorHandler.  Implement your own 
ErrorHandler and you should be able to get those notifications.

Kevin


Colin MacDonald wrote:

>Hi all!  In my application, I need to know if log4j failed to write a log
>message.
>
>I'm using RollingFileAppender, and from looking at the source, it catches
>exceptions and just writes to console.  I'm writing transaction audit logs,
>so if I can't write to the log (disk full, or whatever) I want to abort the
>transaction.  Note that the log writing is done first; it doesn't need to
>part of an atomic transaction.
>
>First, is my reading of the code correct?  Will the code that calls log4j
>not get an exception?
>
>Second, any ideas on how to work around this?  Custom appender?  It seems
>like a waste to re-implement RollingFileAppender.
>
>Thanks for any help on this!
>
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Are there any browser based configuration tools for log4j config files?

[Eric Gilbertson <er...@pervasivesec.com>]

Log4J Users:

Anyone know of an browser based tool for the editing of XML based
log4j configuration files? Ideally this tool would provide a tree view of the
category hierarchy with the ability to modify appenders and category settings.
Searching the archives I did come across "configLog4j" (free download 
available
at www.jahpy.de/configLog4j), but this wasn't quite what I was looking for.

TIA,

Eric Gilbertson
ericg.gilbertson@pervasivesec.com



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RE: RollingFileAppender disk full handling

[Colin MacDonald <co...@templarcorp.com>]

> -----Original Message-----
>
> My aim was to ask the user to replace
> the media if it is full with a new one or choose another location for the
> logfile.

Yeah, my case should be simpler than that.  If I can't write the log, I'll
probably just spit something to console and exit.

> To detect an exception or another error condition, I did add a
> custom errorhandler (as Kevin suggested).

I'll take a stab at that.  Thanks for the code snippet - that may well
simplify things for me.

Thanks!

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