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From Thorsten Scherler <thorsten.scherler....@juntadeandalucia.es>
Subject [JCL] LogConfigurationException headache
Date Thu, 18 Oct 2007 09:56:32 GMT
Hi all,

I am having major headaches lately with some servlets one based on
forrest 0.8 and another based on Spring 2.0 regarding
logging.

It started when deploying some cocoon application to either tomcat 5 and
6 or Jetty 6.1.x.

You can find an extended background summary (from me and others) here:
https://issues.apache.org/jira/browse/FOR-1049

The problem is that forrest/cocoon logging seems to seriously interfere
with my own one (in the spring servlet). I am using ATM
apache-tomcat-6.0.14 but have seen the exact problems in 5.5.x and Jetty
6.1.x.

I have two servlets one is based on cocoon the other one is a very
simple homegrown one based on Spring.

The logging jars for the cocoon one are
thorsten@awesomeO:~/src/apache/tomcat6/webapps$ tree boja2/WEB-INF/lib/|
grep log
|-- avalon-logkit-2.1.jar
|-- commons-logging-1.1.jar
|-- commons-logging-adapters-1.1.jar
|-- commons-logging-api-1.1.jar
|-- excalibur-logger-2.1.jar
|-- log4j-1.2.13.jar
|-- logkit-1.2.2.jar

The logging for the simple servlet is:
tree searcher/WEB-INF/lib/|grep log
|-- commons-logging-1.1.jar
|-- log4j-1.2.14.jar

Now starting tomcat with only one application it is working fine as well
when I "mv" the other app into tomcat there is no problem but as soon as
I *restart* tomcat. BAAANGG!!

Oct 17, 2007 4:22:07 PM org.apache.catalina.core.StandardContext
loadOnStartup
SEVERE: Servlet /searcher threw load() exception
org.apache.commons.logging.LogConfigurationException: User-specified log
class 'org.apache.commons.logging.impl.LogKitLogger' cannot be found or
is not useable.
        at
org.apache.commons.logging.impl.LogFactoryImpl.discoverLogImplementation(LogFactoryImpl.java:798)
        at
org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:601)
        at
org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:333)
        at
org.apache.commons.logging.LogFactory.getLog(LogFactory.java:664)
        at
org.springframework.web.servlet.DispatcherServlet.<clinit>(DispatcherServlet.java:242)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at
java.lang.reflect.Constructor.newInstance(Constructor.java:494)
        at java.lang.Class.newInstance0(Class.java:350)
        at java.lang.Class.newInstance(Class.java:303)
        at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1104)
        at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:981)
        at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4045)
        at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4351)
        at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
        at
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
        at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
        at
org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
        at
org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
        at
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
        at
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
        at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
        at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
        at
org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
        at
org.apache.catalina.core.StandardService.start(StandardService.java:516)
        at
org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:566)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
        at
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

I actually do not understand this exception at all since I do not use
LogKitLogger in the "searcher servlet". In my servlet I have something
like:

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Simple wrapper class to easier debug/log.
 *
 */
public class LoggableSearcher {

  protected final Log log =
LogFactory.getLog(this.getClass().getCanonicalName());

  public LoggableSearcher() {
    super();
  }

}

Which I then extend with a Spring Controller. 
public class SearchController extends LoggableSearcher implements
Controller {
...
}

I am looking for a solution for a while now but actually have not found
any solution only reports about similar problems. 

Can somebody please give me some hints what the problem is and how I can
fix it?

Any input is highly appreciated.

salu2
-- 
Thorsten Scherler                                 thorsten.at.apache.org
Open Source Java                      consulting, training and solutions


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