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From "Bristol, Michael" <michael.bris...@brooks.com>
Subject RE: Error: You have tried to set a null level to root
Date Wed, 01 Sep 2004 20:57:38 GMT
Regarding the "null level to root" issue - I found it to be a symptom of the
order of initialization of objects in the library.  I believe it has been
discussed before - the log4cxx-user mailing list archives have some mention
of it under the context of static library problems.

I poked around in a debugger when I was getting it and found that sometimes
the static members on the Level class that define the logging levels (i.e.
Level::OFF, Level::DEBUG, etc) can be requested by the application before
the module that they reside in has been initialized.  So instead of a
pointer to a new Level Object, asking for Level:OFF just gives you null and
that causes the error.

If I re-ordered the link line so that level.o and logmamager.o came first
and it went away.  Additionally if you've got something calling log4cxx
during pre-main initialization in a shared library environment, make sure
the log4cxx library comes first in the link line.

I have not found a good answer to the "single configuration file" question
yet myself.  Maybe it's intended to be left up to the user of log4cxx to


-----Original Message-----
From: Surekha Guntur [mailto:guntur_surekha@yahoo.com]
Sent: Wednesday, September 01, 2004 4:35 PM
To: log4cxx-user@logging.apache.org
Subject: Error: You have tried to set a null level to root


I am trying to run a sample example 'trivial' (in src/exapmles) I get the
following error on Solaris. It just has BasicConfigurator.
You have tried to set a null level to root.
Segmentation Fault (core dumped)

Any ideas please... I am using log4cxx-0.9.7 version. Do I need to supply
any configuration file or set any environment variables. I tried to set
log4j.configuration environment variable. But it does not take it as it has
'.' (dot) in it. Has anyone come across this problem?


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