Hi guys,
I know it's not a real Tomcat-topic, however, it's close to and I'm
wondering if anyone on this list might come up with some kind of a
smart solution.
Most of you may know the typical first lines of any log4j.xml-config-file:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
So far, so bad.
Why bad?
Because every bloody servlet needs it's very own log4j.dtd together
with it's log4j.xml, which is why I'm looking for a smarter solution.
It's a good thing that every servlet has it's onown log4j.xml so that
each servlet can be configured - here I would like the idea of a
cantral log4j-configuration-file.
However, with log4j.dtd things are slightly different since it's
always a file with the same content and I really dislike redundancies.
So my idea was to use ${CATALINA_HOME}, pass this via "-Dlog4j.dtd as
a Java-property to Tomcat and evaluate this property within log4j.xml,
however, that does not seem to work:
======== [ from catalina.sh ] =================
CATALINA_OPTS=" -Xmx256m -server \
-Djava.awt.headless=true \
-Dlog4j.dtd=${CATALINA_HOME}/common/classes/log4j.dtd \
-Dlog4j.configuration=log4j.xml"
========================================
======== [ from some log4j.xml ] ===============
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "${log4j.dtd}">
========================================
The result:
log4j:ERROR Could not parse url
[file:/home/tomcat/www/common/classes/log4j.xml].
java.net.MalformedURLException: no protocol: ${log4j.dtd}
at java.net.URL.<init>(URL.java:567)
at java.net.URL.<init>(URL.java:464)
[ ...some more stuff deleted ]
I do no that I can pass a URL, so basically some thing like
<!DOCTYPE log4j:configuration SYSTEM "http://localhost/mylog4jconf/log4j.dtd";>
should work, but I don't like the idea that I have some directory just
containg some configuration-files which is accessible via http.
I know, I could use a RemoteAdressFilter which just allows connection
from localhost for this webapp, but all this looks a bit too
complicated /awkward to me.
besides, on this box is not only one but a whole bunch of virtual
hosts with obviously different domains running.
Ah well, before André's complaining: ;)
My config is as follows:
Using CATALINA_BASE: /home/tomcat/www
Using CATALINA_HOME: /home/tomcat/www
Using CATALINA_TMPDIR: /home/tomcat/www/temp
Using JRE_HOME: /opt/jdk1.5
Server version: Apache Tomcat/5.5.17
Server built: Apr 14 2006 02:08:29
Server number: 5.5.17.0
OS Name: Linux
OS Version: 2.6.18-5-686
Architecture: i386
JVM Version: 1.5.0_07-b03
JVM Vendor: Sun Microsystems Inc.
However, same goes for Tomcat 6 with Java 6 and [put your preferred
environment here ]
So guys, anyone smart around here?
Cheers
Gregor
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