Boris Unckel wrote:
Good Morning,
Philippe LEGAY wrote:
Hello
I succeed by black magie to have log via log4j under tomcat 5.5.9. So
when a call my servlet, I have some trace into a file (/tmp/phl.log).
I said black magie, because I had a lot of problems to put the log4.jar
in the right place.
Now, I have just installed the tomcat 5.5.12, reinstalled by web
application and of course the same log4j.properties file. But no more
trace.
So As I have no change the lo4j.properties, I think it is a tomcat
problem.
Properly not.
Questions :
- It seems that Class.forName does not work in tomcat. Why ? bad
definition ot the PATH ?
- How to set the PATH for Class.forName ?
- Where is the log4j.jar ? Or Why does I have no exception ? Is there
some cache into the TOMCAT server ?
Problem is Between Chair and Keyboard :
Tomcat load library from folder. This mechanism is different from "java
-classpath ...mylib.jar ..." where java load the library mylib.jar.
So When I said I have remove all log4j.jar from the Tomcat Environment,
it was not exact, because I had a copy of log4j.jar into test-log4j.jar.
And tomcat is able to find the class definition into test-log4j.jar.
There is no log4j.jar file, but there is in the PATH .jar that contenst
the log4j class definition.
- Is it possible to load by hand log4j (with Class.forName or other
mechanism) and then get (How ? ) the path used to get this library ?
You just have to setup the log configuration and classpathes correct, see
below.
- And the main question : How must I configure the tomcat server to have
log4j trace into my servlet code ? Which version of log4j (5.2.11, or
more ) ? Whee must I put the log4j.jar : tomcat.5.5.12/share/lib ?
Download Log4J (v1.2 or later) and place the log4j jar in
$CATALINA_HOME/common/lib.
Download Commons Logging and place the commons-logging.jar (not
commons-logging-api.jar) in $CATALINA_HOME/common/lib with the log4j jar.
To configure the server globally (not per webapp)
Save log4j.properties into $CATALINA_HOME/common/classes
Remove any log4j.jar or commons-logging.jar from you webapp to test it.
There are two excellent documentations about the configuration:
http://tomcat.apache.org/tomcat-5.5-doc/logging.html
http://tomcat.apache.org/faq/logging.html
=> RTFM : thanks.
As I just need to log4j my application :
"You would place a similar log4j.properties file in your web
application's WEB-INF/classes folder, and log4j1.2.8.jar into
WEB-INF/lib. Then specify your package level logging. This is a basic
setup of log4j which does *not* require Commons-Logging, and you should
consult the log4j documentation for more options. This page is intended
only as a bootstrapping guide."
I do it and no more problem.
There is an other document describing the classloading:
http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html
Thanks.
thanks for your help, it works perfectly now
Best regards, Happy Christmas
PHL.
Regards
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