Re: How to configure to use tomcat and struts to use log4j?

Thu, 14 Aug 2003 11:25:30 -0700

Looks like Struts has a dependency on Commons Logging which is using Log4j under the hood. The commons logging jar is being loaded from a "higher" level classloader (common/lib or server/lib) and can't access classes only provided by a "lower" classloader (your webapp).

Maybe try having the commons logging jar in your WEB-INF/lib.
Where is the struts jar you're using? WEB-INF/lib or higher?

Jon

Zsolt Koppany wrote:

Hi Shapira,

that is what I get when log4.jar is in my .../WEB-INF/lib.

struts.jar is also in my .../WEB-INF/lib. Can that cause the problem?
How can I fix that?

Zsolt

javax.servlet.ServletException: Error instantiating servlet class
org.apache.struts.action.ActionServlet
    at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:912)
    at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:823)
    at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3420)
    at
org.apache.catalina.core.StandardContext.start(StandardContext.java:3608)
    at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
    at
org.apache.catalina.core.StandardHost.start(StandardHost.java:738)
    at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
    at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:347)
    at
org.apache.catalina.core.StandardService.start(StandardService.java:497)
    at
org.apache.catalina.core.StandardServer.start(StandardServer.java:2190)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
    at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
    at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
----- Root Cause -----
java.lang.NoClassDefFoundError: org/apache/log4j/Layout
    at
org.apache.commons.logging.impl.Log4jFactory.getInstance(Log4jFactory.java:140)
    at
org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:257)
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:390)
    at
org.apache.struts.action.ActionServlet.<clinit>(ActionServlet.java:375)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown
Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:903)
    at
org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:823)
    at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3420)
    at
org.apache.catalina.core.StandardContext.start(StandardContext.java:3608)
    at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
    at
org.apache.catalina.core.StandardHost.start(StandardHost.java:738)
    at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
    at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:347)
    at
org.apache.catalina.core.StandardService.start(StandardService.java:497)
    at
org.apache.catalina.core.StandardServer.start(StandardServer.java:2190)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
    at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)


On Wed, 2003-08-06 at 22:01, Shapira, Yoav wrote:

Howdy,


I have tried so many things to use log4j from tomcat and struts and
finaly I found the solution that I have to copy log4.jar into

common/lib

server/lib and <application>/WEB-INF/lib (to be able to get jsp files
compiled). I find it a bit complicated that I have to copy the same jar
file into three different directories.

Is there a better way? 

Simply put log4j.jar in WEB-INF/lib, and your log4j configuration file
in WEB-INF/classes.  That's it.  Don't have copies of log4j in
commons/lib or server/lib, nor a log4j configuration file there.

Yoav Shapira



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