Ghee, that was it, at least for getting the internal Tomcat logging to
go through Log4j.
It didn't solve my static field thing, but that one I also figured out.
Not 100% sure my reasoning is correct, but I think it's due to how
classloading works in Servlets and thus in Tomcat (by default): the
classloaders for webapps do NOT delegate classloading requests to the
parent classloader (by default), thus the same class can be loaded
multiple times: in my case by the bootstrap/system classloader and by
the webapp classloader. And I guess depending on how my webapp
application code tries to access the static field on the appender (don't
have insight to this code, it's a 3rd party framework), it doesn't find
the one where the appender constructor was called on, as my webapp code
gets the class loaded by the webapp classloader, whereas log4j seems to
load all plugins when log4j gets initialized the first time, which is
for Tomcat internal logging, which happens using the bootstrap/system
classloaders.
I tried adding the custom appenders to the WEB-INF/lib of my webapp
(while all other log4j jars live in the tomcat/lib), but this doesn't
work: the loading of log4j.properties in WEB-INF bombs out, because
log4j cannot find the custom appender.
Once I added <Loader delegate="true"/> to the Context, things started to
work. As I'm only deploying this one webapp, this works fine for me (or
so it seems).
If the above makes no sense or there are better ways to get things
going, I'd love to hear it
Tnx for the help so far!
Paul
On 23/02/2019 07:40, Ralph Goers wrote:
I just noticed that you said you have setenv.sh set to
CLASSPATH=“$CATALINA_HOME/lib/*”
That will find the jars but it won’t find your configuration file. You need to
specify
CLASSPATH=“$CATALINA_HOME/lib/*:${CATALINA_HOME}/lib”
Note that lib is specified twice, once with “/*” after it and once with nothing.
Ralph
On Feb 19, 2019, at 9:03 AM, Paul <pgbak...@gmail.com> wrote:
Hi,
Am trying to get Tomcat to log internal stuff through Log4j2, but failing, no
matter how I try.
I've followed the instruction at
https://logging.apache.org/log4j/2.x/log4j-appserver/index.html to no avail.
I have a hard time understanding it, but maybe the problem is that the Log4j2
code is executed in a different classLoader than the tomcat code: I've enabled
classloading debug output (-Xlog:class+load*=debug) and the status logger
(-Dlog4j2.debug) and I see that all Tomcat code is executed by one classloader:
loader: [loader data: 0x000055f64b4557e0 of 'bootstrap']
whereas the Log4j2 code seems executed by a different classloader:
loader: [loader data: 0x00005559e1327de0 for instance a
'jdk/internal/loader/ClassLoaders$AppClassLoader'{0x00000000e10c9c20}]
I have this in setenv.sh and setenv.sh is working properly otherwise:
CLASSPATH="$CATALINA_HOME/lib/*"
The $CATALINA_HOME/lib/ contains my log4j2-tomcat.properties and the log4j-api
and log4j-core jars (alongside slf4j-api.jar and log4j-slf4j-impl.jar). (all
version 2.11.x)
I've also tried with the log4j-webon the classPath, didn't make a difference.
Tried the -Dlog4j.ignoreTCL=true options, no luck.
In the end, my main purpose it to log everything that happens in the JVM
through log4j2 to the console. I've also tried with log4j-jul-2.11.1.jar, but
couldn't get that going either: one of the challenges I have is that I have a
custom appender plugin that needs to be loaded within the same classLoader
hierarchy as where my (single) webapp is running. In the end, I'll be running
only 1 webapp, deployed as a WAR in TOmcat and the whole thing is dockerized,
so neither Tomcat or the WAR are ever restarted/redeployed: if something needs
to change, we'll deploy a new container image
The output to the console of Tomcat is this:
Using CATALINA_BASE: /usr/local/tomcat
Using CATALINA_HOME: /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME: /usr/lib/jvm/zulu11.2.3-jdk11.0.1-linux_musl_x64
Using CLASSPATH:
/usr/local/tomcat/lib/*:/usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar
NOTE: Picked up JDK_JAVA_OPTIONS: --add-opens=java.base/java.lang=ALL-UNNAMED
--add-opens=java.base/java.io=ALL-UNNAMED
--add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
NOTE: Picked up JDK_JAVA_OPTIONS: --add-opens=java.base/java.lang=ALL-UNNAMED
--add-opens=java.base/java.io=ALL-UNNAMED
--add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
DEBUG StatusLogger Using ShutdownCallbackRegistry class
org.apache.logging.log4j.core.util.DefaultShutdownCallbackRegistry
INFO StatusLogger Log4j appears to be running in a Servlet environment, but
there's no log4j-web module available. If you want better web container
support, please add the log4j-web JAR to your web archive or server lib
directory.
INFO StatusLogger Log4j appears to be running in a Servlet environment, but
there's no log4j-web module available. If you want better web container
support, please add the log4j-web JAR to your web archive or server lib
directory.
DEBUG StatusLogger Took 0.143572 seconds to load 208 plugins from
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29
DEBUG StatusLogger PluginManager 'Converter' found 44 plugins
DEBUG StatusLogger Starting OutputStreamManager SYSTEM_OUT.false.false-1
DEBUG StatusLogger Starting LoggerContext[name=799f7e29,
org.apache.logging.log4j.core.LoggerContext@ae13544]...
DEBUG StatusLogger Reconfiguration started for context[name=799f7e29] at URI
null (org.apache.logging.log4j.core.LoggerContext@ae13544) with optional
ClassLoader: null
INFO StatusLogger Log4j appears to be running in a Servlet environment, but
there's no log4j-web module available. If you want better web container
support, please add the log4j-web JAR to your web archive or server lib
directory.
DEBUG StatusLogger PluginManager 'ConfigurationFactory' found 4 plugins
INFO StatusLogger Log4j appears to be running in a Servlet environment, but
there's no log4j-web module available. If you want better web container
support, please add the log4j-web JAR to your web archive or server lib
directory.
INFO StatusLogger Log4j appears to be running in a Servlet environment, but
there's no log4j-web module available. If you want better web container
support, please add the log4j-web JAR to your web archive or server lib
directory.
DEBUG StatusLogger Missing dependencies for Yaml support, ConfigurationFactory
org.apache.logging.log4j.core.config.yaml.YamlConfigurationFactory is inactive
INFO StatusLogger Log4j appears to be running in a Servlet environment, but
there's no log4j-web module available. If you want better web container
support, please add the log4j-web JAR to your web archive or server lib
directory.
DEBUG StatusLogger Missing dependencies for Json support, ConfigurationFactory
org.apache.logging.log4j.core.config.json.JsonConfigurationFactory is inactive
INFO StatusLogger Log4j appears to be running in a Servlet environment, but
there's no log4j-web module available. If you want better web container
support, please add the log4j-web JAR to your web archive or server lib
directory.
DEBUG StatusLogger Using configurationFactory
org.apache.logging.log4j.core.config.ConfigurationFactory$Factory@4e50c791
TRACE StatusLogger Trying to find [log4j2-test799f7e29.properties] using
context class loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.properties] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.properties] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.properties] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test799f7e29.yml] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.yml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.yml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.yml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test799f7e29.yaml] using context
class loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.yaml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.yaml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.yaml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test799f7e29.json] using context
class loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.json] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.json] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.json] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test799f7e29.jsn] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.jsn] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.jsn] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.jsn] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test799f7e29.xml] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.xml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.xml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test799f7e29.xml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test.properties] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test.properties] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.properties] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.properties] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test.yml] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test.yml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.yml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.yml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test.yaml] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test.yaml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.yaml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.yaml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test.json] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test.json] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.json] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.json] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test.jsn] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test.jsn] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.jsn] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.jsn] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2-test.xml] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2-test.xml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.xml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2-test.xml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2799f7e29.properties] using context
class loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2799f7e29.properties] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.properties] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.properties] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2799f7e29.yml] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2799f7e29.yml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.yml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.yml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2799f7e29.yaml] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2799f7e29.yaml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.yaml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.yaml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2799f7e29.json] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2799f7e29.json] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.json] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.json] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2799f7e29.jsn] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2799f7e29.jsn] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.jsn] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.jsn] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2799f7e29.xml] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2799f7e29.xml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.xml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2799f7e29.xml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2.properties] using context class
loader jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2.properties] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.properties] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.properties] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2.yml] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2.yml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.yml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.yml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2.yaml] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2.yaml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.yaml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.yaml] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2.json] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2.json] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.json] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.json] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2.jsn] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2.jsn] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.jsn] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.jsn] using
ClassLoader.getSystemResource().
TRACE StatusLogger Trying to find [log4j2.xml] using context class loader
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29.
TRACE StatusLogger Trying to find [log4j2.xml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.xml] using
jdk.internal.loader.ClassLoaders$AppClassLoader@799f7e29 class loader.
TRACE StatusLogger Trying to find [log4j2.xml] using
ClassLoader.getSystemResource().
ERROR StatusLogger No Log4j 2 configuration file found. Using default
configuration (logging only errors to the console), or user programmatically
provided configurations. Set system property 'log4j2.debug' to show Log4j 2
internal initialization logging. See
https://logging.apache.org/log4j/2.x/manual/configuration.html for instructions
on how to configure Log4j 2
INFO StatusLogger Log4j appears to be running in a Servlet environment, but
there's no log4j-web module available. If you want better web container
support, please add the log4j-web JAR to your web archive or server lib
directory.
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