Problem using log4j with axis2

Question

I created a webservice on axis2 and I used log4j for logging purposes. I'm getting the following error any time a request comes in for this WS: ``` log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender" variable. log4j:ERROR The class "org.apache.log4j.Appender" was loaded by log4j:ERROR [org.apache.catalina.loader.StandardClassLoader@7f342545] whereas object of type log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by [WebappClassLoader delegate: false repositories: /WEB-INF/classes/ ----------> Parent Classloader: org.apache.catalina.loader.StandardClassLoader@7f342545 ]. log4j:ERROR Could not instantiate appender named "CONSOLE". [ERROR] java.lang.NullPointerException ``` My log4j.properties is as follows: ``` log4j.rootCategory=INFO, CONSOLE #log4j.rootCategory=INFO, CONSOLE, LOGFILE # Set the enterprise logger priority to FATAL log4j.logger.org.apache.axis2.enterprise=FATAL log4j.logger.de.hunsicker.jalopy.io=FATAL log4j…

Accepted Answer

You are in Jar Hell. I suspect the problem is you have 2 or more versions of the log4j jar being loaded by two different classloaders. Once I had a similar problem, though it was a different error message. I did a scan and found 7 vevrsions of log4j on my machine. Yikes!

How to avoid it? Eliminate all but one of them.

It worked for me.

Problem using log4j with axis2

Solution

Problem